A Theory of Marital Fertility Transition

In this paper a theory of marital fertility transition that treats birth control diffusion processes and the effects of mortality decline and economic and social development on fertility within a common analytical framework is developed. Utility-cost concepts provide the means for an integrated treatment. Family size utility functions are used and the theory is focused on the effects of development and diffusion on the utilities and costs of alternative family sizes. The principal innovation lies in the conceptualization and analysis of diffusion of birth control, in which the psychic costs of violating social norms against birth control play a central role. When norms shift in favour of birth control, the psychic costs of birth control fall, causing a decline in the demand for children. In highly integrated populations this process can occur very rapidly, resulting in rapid diffusion of birth control and sudden and rapid fertility decline.