According to John Maynard Keynes,

Name: According to John Maynard Keynes,
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According to Keynes, effective demand (the total amount of goods and services that consumers and businesses are willing and able to purchase) determines the level of real GDP in an economy. This means that the level of economic output is not determined solely by the supply of goods and services, as suggested by Say's Law, but also by the level of demand for those goods and services.