The Convergence Horizon — When Does the Problem Change Character?

By approximately 2040–2055, India's internal fertility differential will have substantially narrowed. Bihar's TFR is already significantly lower than 2011 projections. UP has reached or is approaching replacement. By the mid-21st century, the representational problem of today — southern states losing political weight due to demographic success — will transform into a different problem: southern states facing economic and fiscal stress from ageing populations while northern states have young-adult labour surpluses [@cite_orf_age_before_rich].

Tamil Nadu's Chief Minister has already encouraged larger families as an economic imperative. Andhra Pradesh reversed its two-child norm for local election candidates in October 2024. Maharashtra's fertility rate is now lower than Norway's; Sikkim's TFR has fallen to 1.1, prompting state incentives for second children, free childcare, paternity leave and IVF assistance [@cite_lowy_population_paradox].

This transformation requires the reform to serve two purposes simultaneously: (1) protect states that controlled population from being punished for that service in the 2027–2050 window; and (2) create mechanisms that adapt when the problem changes character after 2050. Part 5 (Demographic Convergence Framework) addresses this gap directly.