Say's Law of Markets — attributed to the French classical economist Jean-Baptiste Say and summarised by the phrase 'supply creates its own demand' — is an economic principle asserting that the act of producing goods and services generates an equivalent level of income and purchasing power in the economy sufficient to buy back those goods and services. In other words, production is the source of demand — an economy can never suffer from a permanent general glut of goods as long as markets are free to adjust prices and wages. Say's Law underpinned classical economic thinking for over a century and was a foundational argument against government intervention in the economy. However, John Maynard Keynes famously challenged Say's Law during the Great Depression, arguing that aggregate demand can fall short of aggregate supply, leading to involuntary unemployment and recession. For investors and analysts on Ventura Securities studying macroeconomic theory, monetary policy debates, and the historical evolution of economic thought, Say's Law remains a central reference point in understanding the debate between classical, Keynesian, and supply-side economic frameworks.
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