What is the fallacy of composition and how does it relate to the Keynesian model?

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The Answer is The fallacy of composition is the logical flaw of asserting that what is true for one part of something (like the economy)is true for the entire thing.Keynesian economics was based on recognition of the fallacy of composition; some aspects of the whole economy,Keynes argued,can't be understood simply by understanding its parts.Microeconomics and macroeconomics were seen as distinct.

What Is the Fallacy of Composition and How Does It