"Free markets" is a very general term. There are all sorts of problems that will emerge. Free markets work best when the transaction between two individuals affects only those individuals. Most often, a transaction between you and me affects a third party. That is the source of all problems for government. That is the source of all pollution problems, of the inequality problem. This reality ensures that the end of history will never come.
Milton FriedmanConsider Social Security. The young have always contributed to the support of the old. Earlier, the young helped their own parents out of a sense of love and duty. They now contribute to the support of someone else's parents out of compulsion and fear. The voluntary transfers strengthened the bonds of the family; the compulsory transfers weaken those bonds.
Milton FriedmanWe measure poverty by what I believe is a very, very crude concept. We actually measure poverty by trying to get some kind of an estimate of the minimum expenditures on food that are required to maintain health, multiplying that number by three, and saying that's the level of poverty. And it's a very crude, inaccurate arrangement.
Milton Friedman