That just leaves command-driven communism. Sadly, it just might be the most viable of the four. But only if it crushes the population’s souls to the degree that having an opinion is suppressed by an overarching, 1984-style propagandaesque dictatorship. And of course, it will retain all the normal shortcomings of the model as we know it: it really only works if those running the command economy guess correctly on which techs will win out and which goods will be needed and how to access the relevant inputs to make them. Every. Single. Time.
