If all childrearing is done by women, an increase in men’s wages will have such a pure income effect. Increases in women’s wages raise both household income and the price of children, and so have offsetting income and substitution effects on the demand for children.#
Higher wages for women raise the cost of children relatively more than they raise household income, and lead to a reduction in the number of children that couples choose to have#
This paper argues that a rule, to have normative force, must provide for its own persistence, and shows that the axiomatic-universalist approach of modern moral philosophy cannot do so. If this is the case, evolutionary stability logic limits the space of valid moral norms, and demands at least enough parochiality . . .