I may just be the train that was late to the station on this, but I questioned why anyone (referring to market participants here) would think it makes sense to have a mixed economy for a while. This questioning was based on the idea of having the problems of both (i.e. barriers to market entry due to immense regulation and extensive federal programs that distort the market as examples) a controlled and free market economy clearly evident in our society.
That said, I also realized that gov't can easily sell this on the grounds that they wish to preserve the wealth generation potential of free markets while also providing support to individuals who don't have basic means of life for whatever reason (generational poverty, abuse, disability, economic underdevelopment, etc.). Whether this is actually accomplished is another story entirely (and I certainly don't advocate for the welfare state), but I was curious as to whether anyone could think of a better model - whether theory only or potentially actionable - that would serve the purposes of allowing people to function in totally free markets while also meeting the needs of the poor in a manner that is at least more efficient than what we have now.