Not specifically related to the above discussion, but as more advocacy for truly free markets: Dr. Ben Rogge’s great (and humorous) talk at a FEE conference (in the 70’s I think).
He discusses Competition and Monopoly – the standard economic view of the time, Kenneth Galbraith’s views, and finally the Schumpeter/Rogge view.
This lecture is really a gem - one of the best out there on the topic IMO. It is an hour long talk - but very much worth the effort.