I know of no example in time or place of a society that has been marked by a large measure of political freedom, and that has not also used something comparable to a free market to organize the bulk of economic activity.

Self-interest is not myopic selfishness. It is whatever it is that interests the participants, whatever they value, whatever goals they pursue. The scientist seeking to advance the frontiers of his discipline, the missionary seeking to convert infidels to the true faith, the philanthropist seeking to bring comfort to the needy - all are pursuing their interests, as they see them, as they judge them by their own values.

Society doesn't have values. People have values.

The benefits of a tariff are visible. Union workers can see they are "protected". The harm which a tariff does is invisible. It's spread widely. There are people that don't have jobs because of tariffs but they don't know it.

A private enterprise system needs some measuring rod, it needs something, it needs money to make its transactions. You can't run a big complicated system through barter, through converting one commodity into another. You need a monetary system to operate. And the instability in that monetary system is devastating to the performance of the economy.

How do you hold down government spending?

Had drugs been decriminalized, crack would never have been invented and there would today be fewer addicts... The ghettos would not be drug-and-crime-infested no-man's lands... Colombia, Bolivia and Peru would not be suffering from narco-terror, and we would not be distorting our foreign policy because of it.