Question

What is the business cycle? What causes changes from one phase of the business cycle to another?

Answer 1

The business cycle is the fluctuations in economic activity that an economy experiences over a period of time. There are four main phases: expansion, peak (boom), contraction and trough.
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https://www.boundless.com/economics/textbooks/boundless-economics-textbook/introduction-to-macroeconomics-18/key-topics-in-macroeconomics-91/the-business-cycle-definition-and-phases-342-12439/