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human
Why was Post-WW2 Keynesianism so Effective at Growing the Middle Class? What as an Economic System allowed Keynesianism to Grow the Middle Class?

Hello, I question is: how and why are Keynesian economics so effective at growing the middle class? 

Moreover, what was it about the post-WW2 economic system that allowed the middle class to be built up so much? Does the inherent logic of Keynesian economics lead to the growth of the middle class?

Thanks!
gpt
Keynesianism is a set of ideas about macroeconomics. It's about recessions and it suggests a set of policies that governments should enact when a recession occurs.

Keynesianism is not about the distribution of wealth. Now, J.M.Keynes himself was (at least most of the time) a proponent of a more equal distribution of wealth. But, that's not directly related to what we call Keynesianism. Some parts of Keynesianism can be interpreted as being pro-worker and others as anti-worker.

How exactly are you defining the "Middle Class"? The definition is important, especially for this question. A British historian might tell you that the middle class grew large centuries ago. Is that true? It depends on how it's defined. Is it about profession? Is it about the *level* of income of a certain group? Or is it about the *distribution* of income across everyone?