This book is a welcome reassertion of an old tradition of
interdisdplinary research. That tradition has tended to atrophy in the
last decade, largely because of an enormous expansion of the domain of
neoc1assical economics. The expansion has fed on two sdentific
developments: first, human capital theory; second, contract theory. Both
developments have taken phenomena critical to the operation of the
economy but previously understood in terms of categories separate and
distinct from those with which economists generally work and sought to
apply the same analytical techniques that we use to understand other
economic problems. Human capital theory has applied conventional
techniques to questions of labor supply. It began this endeavor with the
supply of trained labor and then expanded to a general theory of labor
supply by broadening the analysis to the allocation of time over the
individual's life, the interdependendes of supply decisions within the
family, and finally to the formation of the family itself. Similarly,
contract theory has moved from a theory that explains the existence of
c10sed economic institutions to a theory of their formation and
internaioperation. The hallmark of both of these developments is the
extension and applica- tion of analytical techniques based on purposive
maximization under con- traints and the interaction of individual
decision makers through a com- petitive market or its analogue.