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Geography Optional 300+ Score Pack · Model answer

Explain the relationship between net reproductive rate (NRR) and true replacement level of population.

  • UPSC 2019
  • Population and Settlement Geography

Net Reproduction Rate (NRR) is the average number of daughters a newborn girl would bear over her lifetime if prevailing age-specific fertility AND female mortality rates persisted — devised by Böckh (1884) and popularised by Kuczynski (1930s).

You are reading the opening of the model answer. The full answer is part of the Geography Optional 300+ Score Pack.

What the full answer covers

  • The Fertility Ladder: TFR → GRR → NRR
  • From TFR to GRR: the sex-ratio-at-birth discount
  • From GRR to NRR: the survivorship discount
  • NRR = 1 as the Exact Arithmetic of Replacement
  • Why TFR ≈ 2.1 Is Only an Approximation
  • Replacement Level as a Function of Mortality
  • …and 1 more sections, with a conclusion

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