communism (which was an obvious failure)

Compare any communist country to a capitalist country at the same level of technological development and the communist country comes out ahead in wealth and happiness. Communism only seems like a failure because US and EU propaganda does a trick where they compare isolated (often literally blockaded) Communist countries to the wealthiest empires on the planet and say “look how much more money we have! Our system must be better!”

The trouble with Keynesian economics is that it created the conditions for Reagan’s neoliberal revolution to occur, and any country that tries to recreate that economic system will fall into the exact same trap that America did, because the fundamental underlying problem in Capitalism is the ownership of Capital. Capitalists accumulate wealth, and they use that accumulated wealth to capture the system that is supposed to keep them in check, and they sabotage that system for their own profits, and they will do that every single time.