What event led economists to question the usefulness of classical models in explaining how the true economy works?

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The Great Depression, which began in 1929 and lasted for a decade, led economists to question the usefulness of classical models in explaining how the true economy works. Classical economists believed that markets would naturally adjust to ensure full employment and price stability, but the severity and duration of the Depression contradicted these ideas. This led to the development of new theories and models in macroeconomics, including Keynesian economics.

What Event Led Economists to Question the Usefulness of Classical