The compound word “Keynesian Economics” is an oxymoron.
It has never worked. And it never will. It makes no sense whatsoever.
It works. The kicker is what it works for and what the goals are of those who operate by Keynesian rules. It is not free markets. It is justification for control by the “experts” and for political manipulation. For those purposes it works well. For prosperity, well, that is not what the controllers are seeking. It is like calling the Kenyan “incompetent.” To say that you have to posit that he wants the same sort of things you want and doesn’t know how to get them. It ain’t so. What he wants he is getting.