You also know some people who desperately need a course in computational complexity. Markets aren't perfect, of course, but good luck trying to centrally compute distribution of resources.
The various hardness results for economic problems (e.g. computing Nash equilibriums is PPAD-complete) cuts equally much against free markets as against central planning. If a central agent can't solve a given problem within cosmological time scales, then neither can a few billion distributed agents.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.