The Fertility Conversion Gap: Marriage Bottlenecks, Opportunity Costs, and the Limits of Pronatalist Policy in Singapore

Singapore presents a pronounced pronatalist policy puzzle: resident total fertility fell from 1.25 in 2014 to a preliminary record low of 0.87 in 2025 even as public support for marriage and parenthood expanded materially. This paper develops the Fertility Conversion Gap (FCG) framework to explain why aggregate fertility can remain weak despite persistent family aspirations and increasingly generous downstream support. Rather than treating fertility as a single choice, the framework models realised births as a sequence of conditional transitions from family aspiration to partner formation, marriage, first birth, second birth, and higher-order births. A formal Upstream Bottleneck Attenuation proposition shows that the aggregate effect of any intervention at a downstream stage is multiplied by the probability of successfully crossing all preceding stages. The paper combines this model with a dual-constraint household framework in which monetary resources and time-career capacity are separately binding, thereby distinguishing financial affordability from the shadow costs of parenthood. Using a structured analytic case study of official Singapore demographic series, the 2021 Marriage and Parenthood Survey, policy documents through August 2026, and established fertility research, the analysis identifies descriptive patterns consistent with conversion losses at multiple points: weaker relationship and marriage formation, delayed first births, declining completed fertility within marriage, and substantial work-family and care constraints. The 2026 Marriage and Parenthood Reset and National Day Rally reforms broaden support toward longer-duration financial assistance, protected caregiving time, preschool affordability, and housing access, while relationship formation and workplace-cultural constraints remain subjects of continuing policy development. The paper argues that pronatalist policy should be evaluated by stage-specific conversion effects and policy-conversion alignment, not expenditure alone. This reframes Singapore's fertility challenge from a generic affordability problem into a sequential coordination problem across institutions, life-course timing, and household constraints.

fertility conversion gap; marriage; opportunity costs; pronatalist policy; Singapore

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