Abstract
The so-called `diffusion of innovation' approach is often used in
explanations of historical and contemporary fertility declines. We
investigate this issue by developing a new theoretical analysis,
which combines economic and sociological reasoning. Particular attention
is devoted to the role of social networks for the selection of equilibria
in situations when fertility decline constitutes a coordination problem.
We show that the effect of networks depends on the particular interaction
among individuals and on the prevailing socioeconomic conditions:
`information networks' can only speed up a fertility transition that
would also take place in the absence of social interaction, while
`coordination networks' can facilitate demographic change in societies
that would otherwise be caught in a Malthusian situation.
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