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The thing is, Keynesianism isn't really 'of' Keynes. If we take Keynesianism to be the basic postulates that an unmolested market economy has an inherent tendency toward demand-deficiency and has little or no ability itself to reverse this inherent tendency, then Keynesianism is actually much older than Keynes. He was just an upper-class Anglo who formalized what was already obvious enough to the rest of the world in a nigh-unintelligible treatise, a sufficiently respectable personality to serve as a lightning rod for an idea both necessary and heavily-laden with class-political implications, without whom the gap between the laws of economics and the mores of respectability may not have ever been bridged.
If Keynesianism is the above plus his specific policy recommendations, i.e. deficits in depressions, surpluses in booms, stimulus via public works and lowered interest rates, then fair enough.
Re: Rothbard and Friedman, you can tell that they are shameless and sleazy liars because in all of their answers to questions of this nature they will always float blissfully over what is, for honest thinkers, the most glaring issue in all economic questions: how does this effect incomes? And from this question a slew of others: what is the structure of incomes? What are their sources? Without these questions we are left with a model of economy which has no structure of incomes, a model of assumed employment, income and stability, pure as the driven snow; a presupposition of a perfect economy in approaching economic questions. The economics of R and F is useful only to those for whom the issue is never "Do I have enough money?" but "Am I satisfied with the available selection of consumer goods?"
That's a key point, when neoliberal shills refer to the "economy", what they are really referring to is the prices of consumerist trash and the profits of shareholders in various global megacorps. What must be asked is how does this actually improve the living conditions of your average american worker, they will not have a real answer for it other than usual cliche fallbacks like GDP. Who actually benefits from this GDP increase, not the average citizen thats for sure. Unfortunately most proles fall for it when the ZOG apparatus at large declares "our stats show open borders and free trade grow the economy!" because they don't realize how the neoliberal "economy" actually relates to them.
What makes people think the pre-Neoliberal, depression and war governments were anything but the NWO to put it bluntly? (Hence devoting so much of the economy to the military industrial sphere, and creating the outsourcing + simulated demand/debt consumer society.)
There was nothing economically, culturally, socially, artistically, racially sustainable about the postwar era.