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Geography Optional 300+ Score Pack · Model answer

“The rank-size rule is a descriptive regularity rather than a predictive model.” Comment.

  • Settlement Geography

The rank-size rule holds that the population of the rth city in an urban system equals that of the largest divided by r, so that rank plotted against size on logarithmic axes yields a straight line. The quotation poses an epistemological question rather than an empirical one — what kind of statement is the rule?…

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What the full answer covers

  • The Rule as Formally Stated
  • The Descriptive Case: A Genuine Empirical Regularity
  • Why It Is Not a Predictive Model
  • It Carries No Causal Mechanism
  • Several Distinct Processes Generate the Same Distribution
  • It Cannot Say Which City Will Grow
  • …and 5 more sections, with a conclusion

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