Apparently you have never read Milton Friedman
I am very well versed in libertarianism in general, and understand Friedman’s theory. I would agree with libertarianism that in a society of moral people of homogeneous culture the free market without government distortions is the best vehicle of prosperity. I do not think the theory applies in diverse cultures and with intrusive governments at all points of international exchange, especially in secular societies. In the latter environment the “pockets of exclusion” as His Holiness called them will invariably be created, and it becomes the job of the national government to reopen these pockets to healthy commerce and moral behavioral patterns.
A good example is a black ghetto in any major US city: a combination of welfare, anti-business local government, and crime as prevailing economic policy, plus abortion and now free contraception on demand, no-penalty divorce, loose sexual behavior and diversity celebration as cultural policy, — create an environment that the Catechism would call “a system of sin” where moral behavior is not likely to exist, and therefore economic lifts are not likely to emerge.