The equilibrium business cycles are based on the idea that the equilibrium:

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can be a dynamic phenomenon, so it can evolve over time and can serve as a starting point for business cycles analysis.

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assures full employment to everyone.

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in the end, the economies inevitably converge to their natural states, no matter what the governments do.

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is a static phenomenon, so that it does not evolve over time, and thus it is not useful in macroeconomics.

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