OK, I’ve gotta speak up. I’m a PoliSci and Econ Major - on top of being a nerd - and I know a thing or two about all that’s being discussed.
Empirically, it has been the case that economic communism or economic socialism, with large amounts of central planning cannot survive for long (RE; The great leap forward, Stalin’s 5 and 10 year plans…). On the demand side Market conditions are too elastic and on the supply side too few incentives exist.
But it has also been shown that economic capitalism produces negative externalites and without provisions to protect labor, exploits labor unfairly. You still see examples of these Sinclair-esque horror stories in China, where a politically communist but economically capitalist system runs roughshod.
What has emerged - a compromise, if you will - is a reigned in capitalism, where by the gov’t provides the sticks (Taxes, interest rates) and carrots (Tax breaks, contracts, licences, access to foreign markets) to drive an economy. It retains capitalist structure with economically socialist control mechanisms. A great example of this is the German model of co-determination in the Social Market Economy.
As is the point in all applied economics, only a fool stays dogmatic. All the theories ARE fine - they just all have their place and application. There is a time to tax heavy and a time for inflation and a time to stop trade.
But that’s just the economic side to things.
Politically, there are different issues. Again to use China as an example, free markets may not always result in free people - although they seem to be the best precursor to that. Moreover, the most pressing issues in political economy today are how to ejudicate fair trade (b/c there are losers to trade) and maintaining the stability of an interdepenant global economy that is ever more volatile.