What are the differences between the Keynesian school of thought and the Chicago school of thought?

Keynesian economics is a macroeconomic theory that emphasizes the role of demand-side factors, as opposed to supply-side factors. The Chicago school is based on libertarianism with the view that regulation and other government intervention is always inefficient compared to a free market. Its focus is on the supply of money in an economy.

Wikipedia has very good summaries of both.

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