Regionalisation of World Politics: Concepts, Theories and Debates

Between the sovereign state and the global order sits a third layer that neither realism nor liberal internationalism anticipated: the region. Roughly 387 regional trade agreements are in force today, virtually every state belongs to at least one grouping, and the most ambitious of them has generated law that overrides national law. The question this topic asks is not whether regions matter but what kind of thing a region is — a geographic fact, a market outcome, a political project, or an idea that actors argue into existence.

The Vocabulary of Regions: Terms That Are Not Interchangeable

The single most common error in this topic is treating regionalism and regionalisation as synonyms. They name different things, they can move in opposite directions, and the gap between them is where most of the interesting analysis lives.

Region

• A region is a geographically bounded set of states sharing enough in common to be treated as a unit. The commonality can be proximity, history, culture, economic interdependence or a shared security predicament — usually several at once.
• Joseph Nye’s formulation remains the standard reference point:

“A limited number of states linked by a geographical relationship and by a degree of mutual interdependence.” — Nye

• Two elements do the work in that definition. Geography supplies the limit; interdependence supplies the content. Proximity alone produces neighbours, not a region.
• Regions are partly constructed, not simply found. “Southeast Asia” was a wartime Allied command designation before it was a political identity; “the Indo-Pacific” was a marginal oceanographic term until states began organising policy around it. Where the boundary of a region is drawn is itself a political act.
• Sub-regions are smaller clusters inside a region — the Bay of Bengal within South Asia, the Mekong within Southeast Asia, the Maghreb within the Arab world. Micro-regions are cross-border zones below the state level, such as growth triangles linking Singapore, Johor and Riau.

Regionalism, regionalisation and the gap between them

• Regionalism is a policy. It is the conscious, state-led commitment to cooperate with neighbours through formal institutions and agreements, animated by what the founding literature called a common sense of identity and purpose. It is top-down, deliberate and visible in treaties, secretariats and summits.
• Regionalisation is a process. It is the growth of trade, investment, production networks, migration and social interaction within a geographic space, whether or not governments intend it. It is market- and society-driven, bottom-up, and visible in data rather than documents.
• The two are analytically independent, and this is the point.
  • East Asia is the classic case of high regionalisation with weak regionalism. Japanese, Korean and Taiwanese investment built dense regional production networks decades before ASEAN Plus Three existed; the factory came first and the treaty followed, thinly.
  • Africa is the mirror image — dense regionalism with thin regionalisation. The continent has more regional organisations than any other, yet intra-African trade sits at roughly 15–18% of Africa’s total trade, around $220 billion in 2024. The institutions are numerous; the flows they were built to govern are small.
  • The European Union is unusual precisely because the two moved together, each reinforcing the other over seven decades.
• A third possibility is regionalism producing regionalisation. Tariff removal under a free trade area generates trade that would not otherwise exist; the policy manufactures the process. Whether it does so on net is Viner’s question, treated below.

The adjacent terms

• Regional cooperation is the weakest form: states coordinate policy or act jointly on a specific problem without surrendering decision-making authority. Disaster response, river-basin management and counter-terrorism intelligence sharing are cooperation, not integration.
• Regional integration is the deeper form: states voluntarily pool aspects of sovereignty through binding agreements and common institutions, accepting outcomes they did not individually choose. The distinguishing test is whether a member can be bound against its current preference.
• Sub-regionalism is cooperation among a subset of a region’s members, often adopted when the full grouping is deadlocked. BBIN among Bangladesh, Bhutan, India and Nepal, and BIMSTEC across the Bay of Bengal, are both responses to SAARC’s paralysis — the “SAARC minus one” logic institutionalised.
• Inter-regionalism is organised dialogue between two regional groupings as groupings — ASEM linking Asia and Europe, the EU–CELAC summits, the ASEAN–EU relationship. It presupposes that both sides can act collectively.
• Trans-regionalism is cooperation among states drawn from several regions on the basis of shared interest or identity rather than proximity — BRICS, the G-77, IBSA, the OIC. Membership here follows a criterion other than geography, which raises the question of whether it is regionalism at all.

Regionalism is what governments decide; regionalisation is what markets and societies do. The distance between them measures how much of a region is real.

Balassa’s Ladder: Measuring the Depth of Integration

Bela Balassa’s The Theory of Economic Integration supplies the standard scale for how deep an arrangement goes. Each rung subtracts a category of national policy autonomy, and the ladder is cumulative: every stage contains the ones below it.

Stage	What is removed or added	Real examples
Preferential trade arrangement	Tariff concessions on selected goods only; not a Balassa stage but the common entry point	SAPTA (1995), the Global System of Trade Preferences
Free trade area	Internal tariffs and quotas abolished; each member keeps its own external tariff, so rules of origin become necessary	NAFTA/USMCA, AFTA, SAFTA, EFTA
Customs union	Adds a common external tariff, which removes the need for rules of origin and requires a single trade policy	Mercosur (imperfectly), the EU customs union, SACU, the East African Community
Common market	Adds free movement of the factors of production — labour, capital, services, establishment	The EU single market; the ASEAN Economic Community aspires to this and has not reached it
Economic union	Adds harmonised economic policy — fiscal rules, competition law, regulatory convergence	The EU, uniquely
Complete economic integration	Unified monetary, fiscal, social and counter-cyclical policy under a supranational authority whose decisions bind members	No completed case; usually glossed as political union

• Monetary union is not a separate rung; it sits inside the economic-union stage and can be entered without the rest of it.
  • The eurozone is precisely this anomaly — a shared currency and a common central bank without a common budget, treasury or fiscal transfers of any size, which is why its 2010–12 crisis was so severe.
• Balassa’s fifth stage is “complete economic integration”, not “political union”. The distinction matters: his ladder is a scale of economic policy surrender that ends in a supranational authority, and political union is a further inference rather than his term.
• Depth and success are different variables. APEC sits below the first rung — it is a consultative forum with no binding commitments at all — yet it convenes twenty-one economies including the United States, China and Russia. SAFTA occupies the free-trade-area rung on paper and delivers less integration than APEC’s non-binding dialogue.
• Movement down the ladder is possible. Brexit returned the United Kingdom from economic-union membership to a free trade agreement with the bloc, establishing that integration is reversible — a possibility neofunctionalism had no vocabulary for.
• Most of the world’s arrangements never leave the first two rungs, and the WTO’s own count reflects this: of the 640 notifications registered with the GATT/WTO system, 332 are free trade agreements under Article XXIV against only 20 customs unions.

Why States Choose to Regionalise

Economic size and market access

• Integration enlarges the market a firm can sell into without enlarging the state. Removing tariffs and harmonising standards regionally delivers economies of scale, sharper competition and investment that a small national market cannot attract on its own.
• Regional value chains are now a stronger motive than tariff preference. North American automobile production is distributed across three countries by design; European aerospace and East Asian electronics are organised the same way.
  • Once production is fragmented across borders, a tariff on a component is paid several times over — which makes the case for removing it far stronger than the finished-goods case.
• Small and landlocked economies gain disproportionately because integration substitutes for the domestic market they do not have — the core argument behind Nepal’s and Bhutan’s interest in South Asian arrangements.

Bargaining power

• A bloc negotiating as one extracts terms none of its members could extract alone. The Commission negotiates trade for twenty-seven states, which is why the EU concludes agreements at a scale — EU–Mercosur, signed 17 January 2026; EU–India, concluded 26 January 2026 — that its members could not.
• ASEAN’s centrality rests on the same logic: ten and now eleven medium powers acting jointly become the convening node that larger powers must come to.
• The asymmetry is structural. In bilateral negotiation between a large and a small economy, the small economy’s concessions are worth little and its market access is worth much. Aggregation is the only correction available to small states.

Peace and security

• The founding European rationale was not commerce but war prevention — binding French and German coal and steel so tightly that rearmament against each other became materially impossible. Economic integration was the instrument; peace was the purpose.
• Regional organisations also manage security by socialisation rather than deterrence, creating habits of consultation that make miscalculation less likely. This is Deutsch’s territory, treated below.
• Some groupings are security arrangements first and economic ones incidentally — the Gulf Cooperation Council, the Collective Security Treaty Organization, and the Shanghai Cooperation Organisation in its original counter-terrorism form.

Connectivity and infrastructure

• Transport corridors, power grids and pipelines have returns that only appear at regional scale. A grid interconnection is worthless unilaterally and valuable jointly, which makes infrastructure a natural first cooperative sector.
• Connectivity is both cause and consequence of regionalisation. Roads generate the trade that then justifies more roads; the absence of them locks a region into low interaction, which is a large part of the South Asian story.

Cultural and political solidarity

• Shared identity can supply the political will that economics alone does not. Pan-Arabism underwrote the Arab League; a shared Islamic identity underwrites the OIC; Latin American groupings have repeatedly drawn on a patria grande imaginary.
• Solidarity is a weak substitute for interest. The Arab League’s cohesion has not survived its members’ divergent alignments, and identity-based groupings tend to be broad and shallow.

Strategic and geopolitical calculation

• Great powers use regional institutions to project influence at lower cost than force. Leading a grouping converts material preponderance into agenda-setting.
• Smaller states use them to constrain the large. Embedding a powerful neighbour in rules and consensus procedures is the classic weak-state strategy — visible in ASEAN’s insistence on unanimity and in the smaller SAARC members’ preference for institutional procedure over bilateral dealing with India.
• Competitive regionalism is a real driver. The Indo-Pacific Economic Framework, launched in 2022 with fourteen partners, was in substantial part a response to China’s economic weight in Asia; India’s investment in BIMSTEC is in substantial part a response to SAARC’s capture by the India–Pakistan dispute.
• Defensive bandwagoning matters as much as ambition. States join blocs to avoid being the one left outside — the fear of exclusion from a discriminatory arrangement is itself a motive, and it produces a domino dynamic in which each new agreement raises the cost of not having one.

Domestic politics and lock-in

• Regional commitments are often designed to bind the government that makes them. A leader who wants irreversible domestic reform can externalise it: once tariff cuts or competition rules are in a treaty, reversing them costs an international rupture rather than a cabinet decision.
• This is the credible-commitment logic that liberal intergovernmentalism formalises, and it explains why governments sometimes delegate to institutions that constrain them. Mexico’s NAFTA accession and the Central and Eastern European accessions to the EU were both, in part, devices for locking in reform against future domestic reversal.
• Distributional politics inside states shapes what regionalism is possible. Export sectors lobby for market access; import-competing sectors and organised labour resist it. The bargaining position a state takes into a regional negotiation is assembled at home before it reaches the table.

What Successful Integration Delivers

• Growth and trade expansion. The most-cited indicator of integration is the intra-regional trade share — the proportion of a region’s total trade conducted with itself. It varies enormously, and the variation tracks depth of integration closely.

Region	Intra-regional share of trade	Note
Europe	Around 70% — the highest in the world	Within the EU the intra-EU share of a member’s goods trade ranged from 28% (Cyprus) to 83% (Luxembourg) in 2025
Asia	Around half	Driven by production networks rather than by any single treaty
North America	Around 50%	Concentrated in three economies
ASEAN	20% in 2024, down from 24% in 2010	Falling despite deepening formal commitments
Sub-Saharan Africa	15–18%	AfCFTA is designed to change this
South Asia	Around 5%	The lowest of any major region

• Peace and conflict prevention. Interdependence raises the cost of conflict and institutions supply the channels through which disputes are handled short of force. The EU received the Nobel Peace Prize in 2012 for exactly this record; ASEAN’s members have not fought a war with one another since 1967.
• A stronger collective voice. Blocs coordinate positions in global forums and thereby acquire weight their members lack individually. Small-island groupings have shaped climate negotiations far beyond their economic size; the EU speaks as a single party in WTO negotiations.
• Pooled resources and shared knowledge. Regional development banks, joint research programmes, common standards bodies and disaster-response mechanisms spread fixed costs across members facing similar problems. India’s Coalition for Disaster Resilient Infrastructure and the International Solar Alliance apply the same pooling logic across a coalition defined by interest rather than geography.
• Mobility and the making of a regional identity. Schengen abolished internal border checks across most of Europe; Mercosur simplified intra-bloc residence; ASEAN has mutual-recognition arrangements for a handful of professions. Free movement is the mechanism by which a regional identity acquires social depth rather than remaining an elite project.
• Convergence transfers. The EU’s structural and cohesion funds are the only large instance of a region taxing its rich members to develop its poor ones. Their absence elsewhere is one reason integration stalls: without compensation, the losers from liberalisation have no reason to accept it.

Why Regional Projects Stall

• Sovereignty resistance. Integration beyond a free trade area requires accepting decisions a state did not take, and most states will not. ASEAN’s non-interference principle is a deliberate constitutional choice against supranationalism, not an accident of underdevelopment.
• Asymmetry and hegemony fear. A region with one dominant member faces a structural problem: the giant’s proposals look like domination and its restraint looks like disinterest.
  • India accounts for close to 80% of South Asia’s GDP and roughly three-quarters of its population, which makes every Indian initiative in SAARC readable as a bid for influence.
  • Brazil and Argentina together supply the overwhelming majority of Mercosur’s output, generating persistent complaints from Paraguay and Uruguay about unequal gains.
  • The EU’s answer was to bind the strong through law and qualified majority voting; groupings without that machinery have no answer at all.
• Internal political conflict. A single unresolved bilateral dispute can freeze an entire organisation where decisions require unanimity.
  • SAARC has held no summit since Kathmandu in November 2014; the 19th, due at Islamabad in 2016, was cancelled. The SAARC Motor Vehicles Agreement failed at Kathmandu and was salvaged only in the smaller BBIN format.
  • The Gulf Cooperation Council was effectively suspended by the Qatar blockade of 2017–21.
• Divergent levels of development. Where members are at very different income levels, uniform liberalisation produces very uneven effects. ASEAN’s CLMV members — Cambodia, Laos, Myanmar and Vietnam — required extended timelines for tariff commitments; without such flexibilities, poorer members resist, and with them, integration slows.
• The implementation gap. Signature is cheap and compliance is not.
  • SAFTA entered into force on 1 January 2006 and delivered little, because members loaded long sensitive lists exempting the goods that mattered and left non-tariff barriers untouched.
  • The BIMSTEC FTA framework agreement of 2004 remains unconcluded after two decades.
  • Africa’s continental free trade area still lacks agreed rules of origin in textiles, processed foods and several industrial categories — the technical provisions without which tariff schedules do not operate.
• External pressure and global conditions. Great-power competition pulls members in different directions, and the value of a regional deal depends on what the global system is doing.
  • When multilateral negotiation works, regional preference is worth less; when the Doha Round stalled, states turned to regional and bilateral deals, producing a fragmented order rather than a substitute for the global one.
• Overlapping membership and institutional proliferation. A state in four groupings with different tariff schedules, rules of origin and dispute procedures faces contradictory obligations and an administrative burden its customs service cannot carry. Africa is the extreme case, with most states in two or more regional economic communities.

Theories of Regional Integration

Integration theory is unusual in political science in that it was built almost entirely from one case and then asked to explain the rest of the world. Each successive theory is best read as an argument with its predecessor about what the European experience actually demonstrated.

Functionalism: the contrast against which neofunctionalism defined itself

• David Mitrany’s functionalism holds that form should follow function — that the shape and jurisdiction of an international body should be dictated by the task it performs, not by a pre-drawn map. A body governing river navigation should cover the river basin; one governing air traffic should be global.
• It is therefore a-territorial and technocratic by design: authority is transferred piecemeal to expert agencies handling non-controversial needs, sovereignty is not confronted directly, and the accumulation of such agencies gradually produces a working peace system in which the state is bypassed rather than defeated.
• Neofunctionalism breaks with it on two points. It is deliberately regional rather than global, and it denies that technical questions can be insulated from politics: for Haas, integration is driven by self-interested political elites bargaining, not by experts escaping politics.
• The functionalist argument in its own right, including Mitrany’s critique of federalism, belongs with the functionalist approach to international relations and is not repeated here.

Neofunctionalism: Ernst Haas and the logic of spill-over

• Ernst B. Haas’s The Uniting of Europe is the founding text of integration theory, built from the European Coal and Steel Community and generalised outward. His definition of integration is the reference point:

“The tendency toward the voluntary creation of larger political units, each of which self-consciously eschews the use of force in the relations between the participating units and groups.” — Haas

• The state is disaggregated, not treated as a unitary actor. Haas’s units of analysis are political parties, trade unions, business associations and bureaucracies, each with its own stake in integration. Integration proceeds when enough of these actors calculate that their interests are better served at the regional level.
• Preferences are dynamic rather than fixed. This is the sharpest break with realism: participation in common institutions changes what actors want. Interests are an output of the process, not only an input to it.
• Supranationalism is chosen, not imposed. States accept binding institutions because doing so solves collective-action problems they cannot solve by bargaining alone — the institution’s autonomy is the point of it.
• Elite socialisation is the transmission mechanism. Officials who spend years negotiating in Brussels acquire shared reference points, professional networks and a stake in the institution’s survival, and they carry those back into national administrations. Loyalties shift gradually toward the new centre.

The three spill-overs

Haas’s most-borrowed concept is usually stated as one mechanism. It is three, and they operate differently.

Type	Mechanism	Illustration
Functional spill-over	Integrating one sector creates technical problems solvable only by integrating an adjacent sector	A common market in goods is undermined by divergent product standards, divergent competition law and fluctuating currencies — each pulling the next area in
Political spill-over	Interest groups and parties reorient their lobbying and eventually their loyalties toward the regional centre once decisions are taken there	European industry federations and trade union confederations organising at Union level
Cultivated spill-over	The supranational secretariat itself acts as an entrepreneur, brokering package deals and framing further integration as the solution to problems it has helped define	The Commission’s role in launching the single-market programme

• Cultivated spill-over is what makes neofunctionalism a theory of institutional agency, not merely of economic logic. The institution is a player, not a forum.
• Spill-over is a tendency, not a law, and Haas said so — but the early formulation’s expansive tone invited the criticism that it read integration as automatic.

Beyond spill-over: Lindberg and Schmitter

• Leon Lindberg narrowed the theory’s empirics, treating individual decisions rather than whole systems as the unit of analysis so that integration could be measured decision by decision rather than declared.
• Philippe Schmitter supplied the missing vocabulary for what happens when spill-over does not occur, converting a one-directional theory into a menu of outcomes:
  • Spill-around — the proliferation of functionally specialised but strictly intergovernmental bodies. Scope widens; authority does not deepen. Much of ASEAN’s institutional growth fits this description.
  • Build-up — members grant an existing organisation greater authority without widening its remit.
  • Encapsulation — the organisation handles its founding task adequately and simply stops growing. Schmitter treats this as the default outcome rather than the exception.
  • Muddle-about — actors respond to crisis by reasserting existing arrangements without changing them.
  • Spill-back — members withdraw from commitments already made and downgrade the level of cooperation. Brexit is the largest empirical instance the theory has had to accommodate.
• Read together, these make integration a set of possible trajectories rather than an escalator, which is what the theory needed after the 1960s.

Haas’s own retreat

• Haas declared regional integration theory obsolete in the mid-1970s, in a monograph whose title said exactly that. His reasons were substantive rather than modest.
  • The theory assumed a stable environment; actual regional politics unfolded in what he called turbulent fields, where actors pursue multiple inconsistent goals across overlapping institutions and outcomes cannot be predicted from sectoral logic.
  • Integration was being overtaken by interdependence as the more general phenomenon; a theory of regions was a special case of something larger.
  • De Gaulle had falsified the prediction directly — a determined national leader could stop the process, which the theory had not allowed for.
• His late position was a pragmatic constructivism, worked out with Peter Haas: institutions matter because they change how actors understand their problems, consensual knowledge shapes what counts as a solution, and integration is one instance of learning rather than a distinct causal process. The turn is continuous with the original insight that preferences are endogenous.
• Neofunctionalism nonetheless survived its author’s verdict. The single-market programme and the Maastricht bargain revived it; later work on supranational governance rebuilt it empirically; and Schmitter’s observation stands — that rival theories, liberal intergovernmentalism included, retain neofunctionalist assumptions while disclaiming the label.

Transactionalism and security communities: Karl Deutsch

• Karl Deutsch approached integration through communication rather than economics. His method was to measure flows — trade, mail, travel, migration, student exchange — on the argument that dense transactions between societies generate mutual responsiveness, and mutual responsiveness generates trust.
• The destination is a security community: a group among whom war has become unthinkable, marked by what Deutsch called dependable expectations of peaceful change — the shared confidence that conflicts can be resolved, in his phrase, “without resort to large-scale physical force”.
• Two forms, and the distinction is the theory’s most useful export.
  • Amalgamated security communities merge previously independent units under a common government. The United States formed out of the thirteen colonies is Deutsch’s example; amalgamation is rare and can fail, as the Sweden–Norway union did.
  • Pluralistic security communities retain separate sovereignties and lose only the expectation of war between them. The United States and Canada are the standing example; Western Europe and Scandinavia are others.
• Pluralistic communities are easier to build and more durable, because they do not require the constitutional revolution amalgamation demands. That finding — that peace does not require political merger — is what makes Deutsch relevant to regions that will never integrate deeply.
• Emanuel Adler and Michael Barnett reformulated the concept in constructivist terms, replacing transaction counting with shared identity, meanings and reciprocal long-term interest as the substance of community.
  • Their three-phase model traces development through nascent, ascendant and mature stages, rather than treating a security community as present or absent.
  • Mature communities divide into loosely coupled and tightly coupled — the latter approaching post-sovereign governance, the former requiring only that war be off the table.
  • The reformulation lets the concept travel: it can register a region as partially along the path rather than failing a binary test, which is what makes it usable outside Europe.

Intergovernmentalism: Stanley Hoffmann

• Stanley Hoffmann’s answer to Haas was that integration succeeds only where states permit it, and states permit it only in domains they do not consider vital.
• The distinction between low politics and high politics is his central device. Tariffs, agriculture, technical standards and market regulation are low politics, where cooperation delivers gains and costs little. Defence, foreign policy, currency and constitutional identity are high politics, where states guard autonomy and spill-over does not operate.
• The logic of diversity defeats the logic of integration. Where national situations, historical experiences and threat perceptions differ, states will not converge merely because sectoral cooperation makes convergence efficient. Diversity is not friction to be overcome; it is a standing constraint.
• De Gaulle and the empty chair crisis are the empirical core of the argument. France’s boycott of Community institutions in 1965–66 and the Luxembourg Compromise that ended it preserved the national veto on matters of vital interest — precisely at the point where the neofunctionalist script called for majority voting to take hold.
• The nation-state proved obstinate rather than obsolete, which is the formulation Hoffmann’s work is remembered by: it had not been transcended, only made to share some functions.

Liberal intergovernmentalism: Andrew Moravcsik

• Andrew Moravcsik’s The Choice for Europe supplies the most systematic intergovernmentalist account, arguing that the major integration bargains are explained by state preferences and relative bargaining power rather than by supranational entrepreneurship.
• The model has three sequential stages, and its discipline comes from insisting they be explained separately.

Stage	Question answered	Driver
National preference formation	What does each state want?	Domestic economic interests, principally producer groups, aggregated through domestic institutions — not fixed geopolitical interest
Interstate bargaining	Who gets their way?	Asymmetrical interdependence — the state that needs the agreement least can credibly threaten to walk away, and therefore extracts most
Institutional choice	Why delegate to supranational bodies at all?	Credible commitment — governments pool and delegate sovereignty to lock in bargains against future defection by themselves or their partners

• The credible-commitment argument is the theory’s most important claim, because it explains delegation without conceding supranational agency. A commission with monitoring powers and a court with binding jurisdiction exist because governments wanted their partners bound and accepted being bound themselves as the price.
• Grand bargains, not daily politics, are the explanandum. Critics reply that this selects on the cases most favourable to the theory, since treaty negotiations are precisely where governments are most in control, and that it undervalues what institutions do between summits.
• The two intergovernmentalisms differ in their foundations. Hoffmann’s rests on nationalism and the state’s enduring claim on loyalty; Moravcsik’s rests on liberal theory in which state preferences are assembled from domestic economic interests. The second is a theory of demand for integration; the first is a theory of its limits.

The New Regionalism Approach: Hettne and Söderbaum

• Björn Hettne and Fredrik Söderbaum argued that the post-Cold War wave required a different framework, because the classical theories assumed a bipolar world, state actors and economic integration as the driver — none of which described what was actually happening.
• Their organising concept is regionness: the degree to which a geographic area has become an acting subject rather than an object. It is a spectrum, not a threshold, and it runs through five levels.
  • Regional space — a geographical area defined by physical or ecological features, with no organised interaction. A pre-regional zone.
  • Regional complex — widening translocal relations, positive or negative, produce interdependence. Security interdependence counts here as much as trade.
  • Regional society — regionalisation intensifies across economic, political and cultural dimensions; state and non-state actors interact through rules.
  • Regional community — a distinct identity, legitimacy, decision-making structure and capacity to act; mutual trust becomes routine.
  • Region-state — a voluntary evolution of formerly sovereign communities into a new polity with pooled sovereignty and multilayered governance. A hypothetical endpoint.
• The approach is deliberately world-order theory rather than integration theory. Regions are read as responses to global structural change — to the retreat of state-led development, to globalisation, to the end of superpower discipline — not as autonomous experiments.
• It is multidimensional and actor-plural. Security, economics, culture, environment and identity are treated as one process; firms, social movements and informal cross-border networks are actors alongside states.
• Its analytical cost is precision. Regionness is difficult to operationalise, and a spectrum that accommodates everything explains less about any particular case than a narrower theory would.

Constructivist and critical accounts

• Amitav Acharya argues that regions are imagined communities rather than natural containers: they are constructed through discourse, interaction and deliberate norm-building, and their boundaries shift with the political projects that invoke them.
• Norm localisation is his mechanism for how outside ideas take root. Local actors are not passive recipients of circulating norms; they reconstruct them through congruence-building, grafting the foreign norm onto pre-existing beliefs and practices until it acquires local legitimacy.
  • Norms that cannot be localised are rejected; those that can are altered in the process.
• Norm subsidiarity is the reverse movement: weaker actors create rules of their own to preserve autonomy from the dominance, neglect or abuse of stronger central actors. Non-intervention doctrines, nuclear-weapon-free zones and regional peacekeeping norms are generated at the periphery rather than diffused from the core.
  • The ASEAN application of both concepts belongs with the ASEAN case and is developed there.
• Peter Katzenstein’sA World of Regions denies that regions are the enemy of globalisation or of American power.
  • His regions are porous — open to global flows, penetrated by outside actors, and organised around core states operating within an American imperium rather than against it.
  • Asian and European regionalism therefore differ not because one is more advanced, but because their internal structures and their relationships to the United States differ.
• The postcolonial critique targets the discipline itself. Integration theory was built from one case, generalised as if it were universal, and then used to grade every other region against a European benchmark.
  • The result is a persistent EU-centrism in which Global South regionalism is described by what it lacks — no court, no direct effect, no parliament — rather than by what it does.
  • Comparative work is dominated by single-case studies presented as comparison, which limits what can be generalised at all.
  • The corrective is to ask what a region’s institutions were built to do. ASEAN was designed to protect sovereignty, not to pool it, and judging it by the pooling standard mistakes a different objective for a failed one.
• Informal and shadow regionalism is the critical school’s other contribution: much real regional integration in Africa and Southeast Asia happens through unrecorded cross-border trade, kinship networks and elite arrangements that formal institutions neither capture nor control.

Realist and neorealist accounts

• Realism reads regional institutions as reflections of power, not constraints on it. Where a regional order looks stable, the explanation is the local distribution of capabilities — a regional balance of power, or a preponderant state supplying order.
• John Mearsheimer’s false-promise argument is the sharpest version: institutions are arenas for acting out power relations, they have minimal independent effect on state behaviour, and the belief that they can produce peace rests on unproven liberal assumptions. Applied to regions, integration lasts only while it serves the interests of the strongest members.
• Hegemonic stability theory applied regionally predicts that deep integration requires a regional hegemon willing to pay for it — absorbing adjustment costs, opening its market asymmetrically, underwriting institutions.
  • The absence of such a payer is one reading of why South Asian and Latin American integration underperform; a hegemon unwilling to pay is a different failure from having none.
• Regional security complex theory, developed by Barry Buzan and Ole Wæver, is the most useful realist-derived framework here and the one most often missing from accounts of this topic.
  • A regional security complex is a set of units whose security concerns are so interlinked that their national securities cannot realistically be considered apart from one another. The complex exists whether or not anyone builds an institution on it.
  • Its structure is set by four variables: the boundary separating it from neighbours, an anarchic structure of two or more units, the polarity or distribution of power among them, and the social construction of relations as patterns of amity and enmity.
  • Complexes come in types — standard complexes with no regional-level great power, centred complexes organised around one, great power complexes, and supercomplexes where two adjacent complexes are linked by a spillover of great-power rivalry.
  • South Asia is the textbook standard complex, its structure defined by the India–Pakistan dyad; its linkage to East Asia through the India–China relationship is what makes an Asian supercomplex plausible.
  • The theory’s payoff is that it explains regional cooperation and its absence from the same variables. Where amity predominates, institutions can deepen; where enmity is structural, an organisation can exist for four decades and achieve nothing — which is a better account of SAARC than any theory of integration.

Theory	Core driver	Unit of analysis	Prediction about the state
Functionalism	Technical need; form follows function	Task-specific agencies	Gradually bypassed
Neofunctionalism	Spill-over and elite self-interest	Domestic groups, supranational bodies	Transcended by choice
Transactionalism	Communication flows and mutual trust	Societies and their transactions	Retained; war between them ends
Intergovernmentalism	National interest; the logic of diversity	Governments	Obstinate, not obsolete
Liberal intergovernmentalism	Domestic preferences and bargaining power	Governments and producer groups	In control; delegation is instrumental
New regionalism approach	Global structural change	Regions as emergent subjects	One actor among many
Constructivism	Identity, norms, localisation	Ideas and their carriers	Constituted by regional interaction
Realism and RSCT	Power distribution; amity and enmity	The security complex	Unchanged; institutions are epiphenomenal

Old Regionalism and New Regionalism

The literature periodises regional integration into waves, and the periodisation is more than housekeeping: each wave had a different cause, a different design and a different relationship to the world economy.

Dimension	Old regionalism (1950s–70s)	New regionalism (late 1980s onward)
World order	Bipolar; regions as blocs within superpower competition	Post-Cold War, moving toward multipolarity
Principal driver	Security and ideological alignment	Economic competitiveness and globalisation
Trade orientation	Protectionist; import substitution behind common external walls	Open — regional liberalisation alongside global liberalisation
Direction	Top-down, elite- and state-led	Both, with strong bottom-up market and civil-society elements
Actors	States alone	States, firms, civil society, sub-national and transnational networks
Scope	Single-purpose: a tariff union or a defence pact	Multidimensional — trade, security, environment, migration, identity
Membership	Exclusive, bloc-defined, geographically tight	Overlapping, cross-regional, admitting variable geometry
Attitude to sovereignty	Either supranational ambition or none	Pragmatic; flexible commitment and differentiated integration
Exemplars	The early EEC, LAFTA, the Warsaw Pact and NATO as bloc instruments, and the Non-Aligned Movement as a counter-bloc project	The single market, Mercosur, AFTA, APEC, NAFTA, SADC

• Variable geometry is new regionalism’s signature device: members integrate at different depths and speeds within one framework. The eurozone within the EU, Schengen with non-EU participants, and ASEAN’s staged CLMV timetables are all instances.
• The waves are not clean. The EEC began as old regionalism and became the template for the new; the shift is best read as a change in the dominant logic rather than a replacement of one set of organisations by another.
• A third wave has been argued for since the 2010s, usually labelled comparative regionalism, and it is defined by three things the earlier waves lacked.
  • Contestation rather than expansion — Brexit, blocked WTO adjudication, stalled enlargements, and integration that runs backwards.
  • Geo-economic bloc formation — arrangements organised around security alignment and supply-chain control rather than efficiency.
  • A deliberate move away from the European benchmark, toward explaining Global South regionalism on its own terms in what Acharya calls a multiplex world order of many overlapping centres and no single organising model.

Open Regionalism and Its Alternatives

• Open regionalism means extending regional liberalisation to non-members on a most-favoured-nation basis, so that the regional arrangement lowers barriers without discriminating against outsiders. The bloc becomes a device for accelerating global liberalisation rather than for fencing off a market.
• The distinguishing features are voluntary and non-binding commitments, unilateral liberalisation announced and reviewed collectively rather than negotiated as a reciprocal exchange, and no common external tariff to defend.
• Its natural home is a grouping too heterogeneous to bargain reciprocally, which is why APEC adopted it and why the APEC case is where the concept is examined in this set.
• Closed or discriminatory regionalism is the alternative: preferences are reserved for members and denied to outsiders, and the common external tariff makes the discrimination permanent. A customs union is discriminatory by construction.
• The trade-off is real. Open regionalism avoids diverting trade and avoids provoking retaliatory blocs, but it removes the principal incentive to join — the exclusivity of the preference — and therefore delivers weaker commitments. The Bogor Goals were not met on schedule, the standard evidence that voluntarism buys breadth at the price of enforcement.

Regionalism and the Multilateral Trading Order

• The multilateral system’s founding principle is non-discrimination, and a regional preference is a discrimination. The legal accommodation of that contradiction is what makes regional trade agreements possible at all.
  • GATT Article XXIV permits customs unions and free trade areas provided duties are eliminated on substantially all the trade between members, the arrangement is completed within a reasonable period, and external barriers are not raised on the whole.
  • The Enabling Clause of 1979 lets developing countries exchange preferences among themselves on looser terms — the provision under which SAPTA, SAFTA and most South–South arrangements are notified.
  • The legal architecture, its notification machinery and the review problem belong with the account of the GATT and WTO system. What matters here is the consequence: 387 agreements are in force, and roughly a third of them are notified under provisions whose conditions have almost never been tested to a finding.
• Jacob Viner established the analytical core in The Customs Union Issue: a preferential arrangement is not unambiguously good.
  • Trade creation occurs when a member’s high-cost domestic production is displaced by a partner’s lower-cost production. Resources shift toward comparative advantage; welfare rises.
  • Trade diversion occurs when imports shift from an efficient non-member to a less efficient member purely because the member’s goods now enter duty-free. The consumer gains from the lower price; the treasury loses the tariff; the world loses the efficient supplier.
  • The net effect is an empirical question, not a theoretical result. Diversion is likelier where the external tariff is high, where members’ economies are similar rather than complementary, and where the bloc is small relative to the efficient producers outside it — which is why Viner’s warning bites hardest on developing-country arrangements.
• Jagdish Bhagwati turned this into the central question about regionalism’s direction of travel: are preferential agreements building blocks toward global liberalisation, or stumbling blocks that entrench it at the regional level?
  • The building-block case: regional deals liberalise faster than consensus-bound global negotiations, they pioneer disciplines — services, investment, digital trade, standards — that multilateral rules later absorb, and they build domestic constituencies for openness.
  • The stumbling-block case: exporters who have already secured preferential access lose interest in multilateral liberalisation that would erode it, negotiating capacity in small administrations is consumed by bilateral deals, and the preference becomes a political asset to be defended.
  • The spaghetti bowl is Bhagwati’s image for the result: dozens of overlapping agreements, each with its own tariff schedule, phase-in period and rules of origin, so the applicable tariff on one consignment depends on which agreement the exporter can document.
  • Compliance costs frequently exceed the preference margin, and small firms simply do not use the agreements their governments signed.
• Robert Lawrence’s distinction between shallow and deep integration explains why the modern agreement looks nothing like its 1960s ancestor.
  • Shallow integration removes barriers at the border — tariffs and quotas.
  • Deep integration harmonises what happens behind it: regulation, competition policy, investment rules, procurement, standards and data.
  • Deep integration is where sovereignty is actually engaged, and it is where regional agreements now do most of their work.
• Did regionalism substitute for multilateralism? The correlation is suggestive rather than conclusive.
  • The wave of new agreements accelerated exactly as the Doha Round stalled, and states plainly diverted negotiating effort to them.
  • But the substitution runs both ways: those agreements were the mechanism through which liberalisation continued at all when the multilateral track froze, and their disciplines remain the likeliest template for any revival of it.

Regionalisation and Globalisation

Whether regionalism reinforces global integration or fragments it is the oldest live argument in this topic, and it has been reopened by the 2020s. Globalisation as a phenomenon in its own right is treated in the companion notes on globalisation and its responses; what is argued here is only the relationship between the two.

• Regionalism as a building block. Regional liberalisation habituates states to openness, creates the domestic coalitions that support it, and produces rules that scale upward. On this reading regions are the practice ground for global integration, and multi-layered governance is a feature rather than a defect.
• Regionalism as a defensive shelter. Small and vulnerable economies use regional arrangements to manage exposure to global markets rather than to accelerate it — pooling reserves, coordinating regulation, and gaining collective standing against forces they cannot individually resist. The bloc here is a buffer, not a bridge.
• Regionalism as a stepping stone. The region is where a state builds the competitiveness it will need globally: firms scale within a protected regional market, learn to meet regional standards, and enter world markets from a stronger position. This was the explicit East Asian sequence.
• Regionalism as fragmentation. Discriminatory blocs divert trade, harden into rival standards regimes, and reproduce great-power competition in economic form. On this reading regional integration is not a stage on the way to a global order but a substitute for it.
• The 2020s have made the fragmentation reading newly plausible, and the vocabulary is now policy language rather than academic speculation.
  • Friend-shoring — relocating supply chains to politically aligned states — entered official usage through the US Treasury in April 2022.
  • Near-shoring relocates production to geographically proximate states, which regionalises supply chains directly; reshoring brings it home.
  • De-risking rather than decoupling was adopted as the European framing in March 2023 and taken up by the G7 the same year: reduce dependence in critical sectors without severing the relationship.
  • Geo-economic fragmentation is the IMF’s term for the policy-driven reversal of integration, transmitted through five channels — trade, capital, migration, technology and the provision of global public goods.
• The evidence is measurable, not merely rhetorical. IMF work found that after 2022, trade between geopolitically distant blocs fell roughly 12% more than trade within blocs, and cross-bloc foreign direct investment roughly 20% more.
  • Modelled long-run costs of severe fragmentation run to about 7% of world GDP, with low-income countries bearing several times the average loss.
• The result is a genuinely open question rather than a settled one.
  • Regionalisation is rising for reasons unconnected to regional integration policy: security alignment and supply-chain resilience now do the work that tariff preference once did.
  • Blocs are forming around alignment rather than around geography — a different phenomenon from the regionalism this topic began by describing.

The regionalism of the 2020s is being driven by security managers rather than trade negotiators, and that changes what it is for.

Regionalism Without Geography

• Some of the most consequential groupings in world politics have no geographic basis at all. They are coalitions of position — assembled around a shared structural situation, a shared grievance or a shared ambition — and they behave differently from geographic regions in ways that clarify what regionalism actually rests on.
• BRICS began as an investment-bank acronym, became a summit process, and is now a membership organisation.
  • It expanded to ten full members with Egypt, Ethiopia, Iran and the UAE joining in 2024 and Indonesia in 2025, alongside a wider tier of partner countries; Saudi Arabia’s status has remained deliberately ambiguous.
  • Its output — the New Development Bank, the Contingent Reserve Arrangement, coordinated pressure for quota reform — is directed at the governance of the global system, not at integrating a space.
• The G-77 is the original coalition of this kind, formed to aggregate developing-country bargaining power in trade and development negotiations. It is treated in full, with UNCTAD and the New International Economic Order, in the companion note on the North–South divide.
• IBSA links India, Brazil and South Africa on the criterion of being large, democratic, developing and non-Western — three continents, one political self-description.
• The OIC is organised on religious identity across four continents; the Commonwealth on a shared colonial history and inherited institutions.
• What distinguishes these from geographic regionalism is decisive.

	Geographic regionalism	Trans-regional coalitions
Basis of membership	Proximity and interdependence	Shared position, identity or interest
Typical agenda	Trade, movement, connectivity, neighbourhood security	Global governance reform, normative claims, collective bargaining
Depth possible	Up to supranational law and free movement	Consultative; deep integration is geographically impossible
Exit cost	High — neighbours remain neighbours	Low — the coalition can simply be left
Failure mode	Bilateral disputes freeze the institution	Dilution as membership widens and interests diverge

• The conceptual lesson is that geography is a strong facilitator of integration but not its definition. What integration actually requires is dense interdependence, convergent interests and the willingness to be bound; proximity usually supplies the first, sometimes the second, and never by itself the third.
• The reverse also holds: a geographic region whose members have no convergent interest achieves less than a scattered coalition that does. That comparison is the standing reproach to South Asian regionalism.

The Five Named Cases Compared

	EU	ASEAN	APEC	NAFTA / USMCA	SAARC
Depth	Economic union with monetary union for a subset	Free trade area aspiring to a common market	Below the ladder — consultative forum	Free trade area with deep behind-the-border rules	Free trade area on paper
Decision rule	Qualified majority in most fields; unanimity on the rest	Consensus and non-interference	Voluntary, non-binding, concerted unilateral action	Negotiated treaty commitments among three	Unanimity, with bilateral disputes excluded
Dispute settlement	A court with binding jurisdiction and directly effective law	Mechanisms exist and are essentially unused	None	State-to-state panels plus a labour enforcement mechanism	None operative
Scope	Comprehensive — economic, monetary, legal, foreign policy, mobility	Political-security, economic and socio-cultural pillars	Trade facilitation and economic-technical cooperation	Trade, investment, labour, digital, energy	Broad on paper, minimal in practice
Outcome	Deepest integration achieved anywhere; also the most severe crises	Durable, sovereignty-preserving, shallow; the region’s convening hub	Broad membership, weak commitment, unmet targets	Large trade expansion; now under annual review to 2036	The clearest case of institutional paralysis

• The pattern across the row is consistent: depth is bought with sovereignty and nothing else buys it. Every grouping that declined binding law has stayed at or below the free-trade-area rung; the one that accepted it has faced crises proportionate to its depth.

India’s Regionalism, Read Conceptually

India is the only major power that is simultaneously the overwhelming preponderant in its own region and a middle player in every wider grouping it joins. That double position explains almost everything about its regional policy.

Two doctrines, two theories of regionalism

• Neighbourhood First is a proximity theory. It treats the immediate region as a distinct policy space and prioritises the neighbours in resources and leader-level attention.
  • It accepts asymmetric, non-reciprocal generosity — the principle earlier articulated as the Gujral Doctrine, under which the largest state gives without demanding equivalent return, because reciprocity between unequals is not available.
• Act East is an interest theory. It extends engagement well beyond geographic South Asia into Southeast and East Asia on the basis of trade, connectivity and strategic alignment, and it makes no assumption that neighbours are the natural partners. The two doctrines coexist because India’s most valuable regional relationships are not with its most proximate states.
• The tension is structural rather than a policy inconsistency. Neighbourhood First treats the region as a responsibility; Act East treats regions as instruments. Where the neighbourhood underperforms, Indian effort migrates outward — which is exactly what the shift of attention from SAARC to BIMSTEC represents.

Asymmetry as an obstacle, not an advantage

• India’s preponderance is the principal structural impediment to South Asian integration. It supplies close to 80% of the region’s economic output and roughly three-quarters of its population; every proposal it makes is legible to its neighbours as a bid for influence, and every restraint as indifference.
• Smaller neighbours therefore hedge, seeking external balancers and preferring the institutional veto to bilateral bargaining — which is why SAARC’s unanimity rule and the exclusion of bilateral disputes from its agenda were insisted upon at the outset and have never been relaxed.
• Intra-regional trade of around 5% is the measurable consequence. South Asia is the least economically integrated region in the world despite contiguity, shared infrastructure history and common languages across borders.

Overlapping memberships as variable geometry in practice

• India belongs to groupings organised on incompatible principles at the same time, and it treats this as strategy rather than confusion. The label for it is multi-alignment; the structural description is variable geometry.

Grouping	Organising principle	What India uses it for
SAARC	Geographic region	Membership retained; no summit since Kathmandu
BIMSTEC	Sub-regionalism around a stalled region	Connectivity and cooperation without Pakistan
IORA	Maritime space rather than landmass	Indian Ocean order-setting
SCO	Continental Eurasia	Presence alongside both a rival and a competitor
BRICS	Trans-regional coalition of position	Global governance reform, financial alternatives
Quad	Alignment-based minilateral	Indo-Pacific security and technology cooperation
I2U2	Interest coalition across West Asia	Investment and technology corridors
IPEF	Geo-economic framework without market access	Supply chains and clean energy; India stayed out of its trade pillar

• No two of these have the same membership, and several contain states that are adversaries of each other. This is only sustainable because none demands binding commitment — the price of variable geometry is shallowness, and India has consistently accepted that trade.

RCEP: adjustment costs against integration

• India’s withdrawal from the Regional Comprehensive Economic Partnership is the clearest recent instance of a state weighing regional integration against the domestic cost of adjusting to it, and deciding against.
  • The concerns were distributional and specific: an existing and widening goods deficit with China, exposure of dairy and small manufacturing to tariff elimination, doubt that safeguard triggers would work, fear that rules of origin would let non-members route goods through members, and the absence of gains in services and professional mobility where India’s comparative advantage lies.
  • The decision is precisely what liberal intergovernmentalism predicts: national preferences assembled from domestic producer interests, weighed against a bargain whose distribution of gains the government judged unfavourable.
• It was not a turn against trade agreements as such, the common misreading. India has since brought into force deep bilateral agreements with the UAE and Australia, the EFTA states from 1 October 2025 and the United Kingdom from 15 July 2026, and concluded negotiations with the European Union in January 2026.
• The revealed preference is for negotiated bilateral depth over membership of a bloc organised around a strategic competitor. Read against Balassa, India has chosen a widening set of free trade areas and declined every arrangement that would pool authority.

Indian argument in the field

• Jagdish Bhagwati’s critique of preferential trading — the stumbling-block argument and the spaghetti bowl — is the single most influential Indian contribution to this literature, and it cuts against the regionalism India itself now practises.
• Amitav Acharya’s work on imagined regions, norm localisation, norm subsidiarity and the multiplex order is the principal challenge to European-derived integration theory, and it supplies the framework in which non-Western regionalism is judged by its own purposes.
• The Gujral Doctrine remains an original theoretical proposition rather than merely a policy: that in a region of extreme asymmetry, the large state must accept non-reciprocity if integration is to begin at all. Its record is mixed, but no alternative solution to the asymmetry problem has been proposed for South Asia.

Conclusion

Regionalism is not a stage between the nation-state and world government but a permanent third level of political organisation. The theories disagree about what drives it — spill-over, transactions, national interest, domestic preference, identity, power — because each was built from a different case. What the comparative record establishes is narrower and firmer: depth of integration tracks willingness to be bound, and nothing else. As alignment replaces efficiency as the organising principle of economic blocs, the open question is whether the regions that matter will still be defined by geography.