Great Depression causes: how a stock market crash became a decade of crisis

What caused the Great Depression after the stock market crash?

The Great Depression had no single cause. The Federal Reserve History essay stresses monetary policy: the Fed raised rates in 1928 and 1929, repeated the move in fall 1931, and did not act as lender of last resort during the banking panics. Wikipedia adds the gold standard, tariffs, and debt as further links in the chain.

A stock market crash in October 1929 started the chain only in a loose sense. The Federal Reserve History essay notes that recovery seemed imminent by fall 1930, so later events carried the slump into a decade. This page follows those events one cause at a time, with the numbers each source reports.

How did Federal Reserve policy feed the Great Depression?

Policy errors came first. The Fed raised interest rates in 1928 and 1929 to curb securities speculation, and that slowed the U.S. economy. It repeated the rate-raising mistake during the international crisis of fall 1931. Each increase tightened credit at a moment when firms and banks needed more of it.

Rescue efforts arrived late and small. The Fed began expanding the monetary base in spring 1931, but the expansion was too small. In spring 1932, after Congress granted new authority, it expanded the base aggressively, then changed course and let the contraction resume. The record shows a central bank that moved in both directions.

How far did the money supply fall in the Great Depression?

The money supply tells the same story in one number. From fall 1930 through winter 1933 it fell by nearly 30 percent, according to the Federal Reserve History essay, and average prices fell by a similar amount. Friedman and Schwartz, cited in Wikipedia, put the monetary contraction at 35 percent and called it the Great Contraction.

A shrinking money supply raises the weight of every debt. Irving Fisher’s debt-deflation account describes the loop: falling prices increase the real burden of loans, borrowers sell assets to repay, and sales push prices down further. Wikipedia lists this loop beside the monetarist view as a leading explanation.

How did the gold standard spread the Great Depression abroad?

The international gold standard tied interest rates and monetary policy across participating nations. When the Fed raised rates in 1928 and 1929, recessions followed abroad. Wikipedia calls the gold standard the main transmission mechanism for the global spread of the downturn.

The exit came in 1933. The United States suspended the gold standard in March 1933, imposed exchange controls, and devalued in April, and Executive Order 6102 of 5 April 1933 made private ownership of gold certificates, coins, and bullion illegal. Wikipedia notes that most countries began recovering in 1933.

How did bank panics become a cause of the Great Depression?

Bank panics turned a slump into a crisis. The first major banking crisis began in November 1930, and over 800 banks had closed by January 1931. By October 1931 over 2,100 banks had been suspended, and more than 9,000 had closed by 1933, according to Wikipedia.

Depositors withdrew an estimated $6.8 billion, and roughly $1.36 billion, about 20%, was lost in failed banks. Friedman and Schwartz argued that withdrawals forced banks to liquidate loans, which shrank the money supply. Deposit insurance did not exist yet, a gap that the Glass-Steagall Act filled in 1933.

Did the Smoot-Hawley tariff add to the Great Depression?

The Smoot-Hawley Tariff Act, signed by Hoover on 17 June 1930, raised tariffs on over 20,000 imported goods. A petition that began with 1,028 economists, and was ultimately signed by over 1,250, asked Hoover in May 1930 to veto it. Wikipedia reports that U.S. imports fell 66%, from $4.4 billion in 1929 to $1.5 billion in 1933.

Scholars differ on the weight. Wikipedia notes that most of the trade decline stemmed from the broader GDP collapse, with tariffs and retaliation adding to it, and that Milton Friedman considered the tariff a minor cause. The balanced reading treats it as an accelerant that came after the crash, not as its trigger.

Which other theories explain Great Depression causes?

Four more explanations complete the picture. Keynesians point to insufficient private and public spending. The expectations hypothesis says a shift in public expectations under Roosevelt drove much of the recovery. The Austrian School blames an unsustainable credit boom fuelled by money-supply growth in the 1920s.

No single theory explains every number. Monetary theories explain the money supply, debt theories explain the weight of loans, and trade theories explain the fall in exports. A reader who holds 3 theories at once explains more of the record than a reader who holds 1.

What do Great Depression causes suggest for readers today?

Causes translate into indicators. Watch whether a central bank tightens while credit is already stretched, whether bank funding can run, and whether a fixed exchange rate transmits stress across borders. As of October 2026 these checks give a probability, never a date. This page is general information, not investment advice.

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Stéphane Jambu

President, EQOS Forecast Asia

Stéphane Jambu leads EQOS Forecast Asia and works as a consultant in e-commerce, search visibility, and AI. LinkedIn profile