The most fundamental constraint is limited time

Human capital analysis starts with the assumption that individuals decide on their education, training, medical care, and other additions to knowledge and health by weighing the benefits and costs. Benefits include cultural and other non-monetary gains along with improvement in earnings and occupations, while costs usually depend mainly on the foregone value of the time spent on these investments.

Even a wizard would have a great deal of difficulty repealing the economic law that higher minimum wages reduce employment. Since politicians are not wizards, they should not try.

Fines are preferable to imprisonment and other types of punishment because they are more efficient. With a fine, the punishment to offenders is also revenue to the State.

Different constraints are decisive for different situations, but the most fundamental constraint is limited time.

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