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I freely admit that I am more of a Keynsian than not. Central planning and manipulation can provide longer stretches of better performance for more people. But I think that any honest Keynsians will admit that their games are cyclic and periodic resets are necessary. Usually marked by devolution into blatant cronyism and totalitarian nightmare as the fiat backing (the justice system) fails.
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Yeah, this is what's missed in a lot of Keynsian vs Austrian discussions. The counter-cyclical math *does* work, it's just that it's impossible for humanity to actually implement without the devolution you mention; thus, an "honest money" ends up being better in practice, longrun.
A misappreciation for the human factor is what draws so many genuinely bright minds to central planning. The math, they think, is elegant and works, so that's that. The realities of moral hazard and political incentives (literally) do not entire the equation.
Anyways...will address the rest of your comment when I have more time.