Along with others, I have tried to pry economists away from narrow assumptions about self interest. Behavior is driven by a much richer set of values and preferences.

Why in almost all societies have married women specialized in bearing and rearing children and in certain agricultural activities, whereas married men have done most of the fighting and market work?

Economy is the art of making the most of life.

The Treatise tries to analyze not only modern Western families, but also those in other cultures and the changes in family structure during the past several centuries.

I am saying that the economic approach provides a valuable unified framework for understanding all human behaviour

Still, intuitive assumptions about behavior is only the starting point of systematic analysis, for alone they do not yield many interesting implications.

The most fundamental constraint is limited time