The Great Depression: Causes, Timeline, and Effects

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The Great Depression was the deepest and longest economic downturn in modern U.S. history. It began in 1929, reached its low point in 1932 to 1933, and lasted in some form until the United States entered World War II around 1941. The stock market crash of October 1929 is the event most people associate with it. Economists and historians, however, generally treat the crash as a trigger and not the full cause. The depth and length of the Depression came from a combination of factors: waves of bank failures, a collapse in the money supply, the constraints of the gold standard, falling demand, protectionist tariffs, and government policies that slowed the economy’s ability to adjust.

When was the Great Depression? A timeline

The start date most often given is 1929. The economy had already begun to slow over the summer, and the official business-cycle record dates the peak to August 1929, two months before the crash. The contraction ran until March 1933. A recovery followed, interrupted by a sharp recession from 1937 to 1938. Unemployment did not return to pre-Depression levels until the war economy took hold in the early 1940s.

Key events in order:

1. 1920 to 1921: The Forgotten Depression, a short, severe slump in which stocks fell by nearly half and corporate profits by more than 90%.
2. 1921 to 1929: The Roaring Twenties boom, fueled by rapid credit growth and speculation in real estate and stocks.
3. October 24, 1929: Black Thursday, the first day of panic selling on the New York Stock Exchange.
4. October 28 and 29, 1929: Black Monday and Black Tuesday; the Dow loses more than 20% over two sessions.
5. June 1930: Hoover signs the Smoot-Hawley Tariff Act.
6. Late 1930 to 1933: Successive U.S. banking panics.
7. May 1931: Austria’s Creditanstalt collapses, spreading the crisis across Europe.
8. September 1931: Britain leaves the gold standard; the Federal Reserve raises rates.
9. July 1932: The Dow bottoms almost 90% below its 1929 peak.
10. March 1933: Roosevelt takes office, declares a national bank holiday and begins the New Deal.
11. 1935: The Social Security Act becomes law.
12. 1937 to 1938: A relapse into recession.
13. December 1941: The United States enters World War II, and mobilization absorbs the remaining unemployment.

The 1920s boom and the 1929 stock market crash

After the 1920 to 1921 slump, the U.S. economy grew strongly for most of the decade. Automobiles, radios and household appliances spread quickly, often bought on installment credit, and ordinary Americans, not just wealthy investors, began buying stocks in large numbers.

Much of that buying was done on margin, with investors borrowing a large share of the price from brokers. Margin magnifies losses in a falling market and forces selling when lenders demand more collateral. Easy credit pushed up prices in both real estate and stocks.

By the fall of 1929, stocks traded at more than 19 times after-tax corporate earnings, a record multiple at the time, and the Dow had risen roughly 500% in five years. Selling began on Thursday, October 24. Prominent New York bankers bought shares in public to restore confidence, and the market briefly rallied, but the panic returned the following week, when the Dow fell more than 20% on Black Monday and Black Tuesday combined.

The crash was not a single-week event. Prices recovered somewhat in early 1930, then slid for more than two years to the July 1932 low, almost 90% below their 1929 level. The Dow did not regain its 1929 peak until 1954.

From crash to depression: the economic collapse

The crash wiped out a large amount of paper wealth for households and businesses. People who had lost savings or faced margin calls cut spending, and companies facing uncertain demand cut investment and production. That reduced income, which reduced spending further.

The numbers show how far the economy fell:

• Unemployment rose from about 3.2% in 1929 to roughly 25% in 1933, and was still near 19% in 1938.
• Output: real gross domestic product fell by roughly a quarter between 1929 and 1933.
• Prices: consumer prices dropped by about a quarter over the same period, a severe deflation.
• Banks: about 9,000 banks failed between 1930 and 1933.

Deflation made the downturn worse. When prices and wages fall but debts stay fixed in dollars, the real burden of those debts rises. A farmer who borrowed against land in the 1920s had to repay the same dollar amount with crops selling for far less. Defaults rose, the banks holding those loans weakened, and the cycle continued, a process economist Irving Fisher called “debt deflation.”

Earlier crashes had been followed by recoveries within a year or two. What made the slump after 1929 so deep and long was largely what happened to the banking system and the money supply.

The Federal Reserve and the money supply

The Federal Reserve was created in 1913, partly in response to the Panic of 1907, when J.P. Morgan organized Wall Street banks to move money to institutions facing runs. Congress wanted a public lender of last resort instead.

Easy money in the 1920s

Monetarist economists such as Milton Friedman, and later former Fed Chair Ben Bernanke, argued that the young central bank mismanaged money and credit both before and after the crash. After reserve requirements were lowered in 1917, the money supply grew by about $28 billion between 1921 and 1928, an increase of 61.8%, while gold reserves, which in principle backed the currency, grew by only about $1.16 billion. Critics argue that much of this credit flowed into stock and real estate speculation.

Contraction after the crash

After the bubble burst, the money supply fell by roughly a third between 1929 and 1933. In his 2002 remarks on Friedman’s work, Bernanke noted that before the Fed existed, bank panics were often resolved within weeks as large banks lent to sound smaller ones. By 1929 the system was too large for private rescues of the 1907 kind; only the central bank could stop a systemwide run, and in the monetarist account it failed to supply enough reserves and let thousands of banks close.

Several factors made the damage worse:

• Banking structure: Limits on branch banking left many U.S. banks as small, single-office institutions tied to one local economy and unable to diversify enough to survive heavy withdrawals.
• No deposit insurance: A rumor about one bank could trigger runs at nearby banks, turning local problems into regional panics.
• Policy beliefs: Some officials believed weak banks should be allowed to fail, since rescues would encourage reckless behavior in the future.

When a bank failed, its deposits disappeared, and surviving banks hoarded reserves and called in loans. That shrinking of money and credit fed deflation and choked off any quick recovery. Bernanke ended his 2002 speech by telling Friedman and Anna Schwartz that the Fed had caused the Depression and would not do it again. His Fed’s aggressive response during the 2008 financial crisis was shaped by that view.

The gold standard and the global depression

The Great Depression was a worldwide event. Under the international gold standard, countries tied their currencies to gold at fixed rates, which linked their monetary policies. When gold flowed out of a country, its central bank was expected to raise interest rates and contract credit to defend the exchange rate, even in the middle of a slump.

The crisis spread to Europe when Creditanstalt failed in 1931, setting off banking panics in Austria and Germany. In September 1931 Britain left the gold standard. Fearing gold outflows, the Federal Reserve raised interest rates that October, tightening credit while the U.S. economy was still contracting and banks were failing.

Economic historians have found that countries recovered roughly in the order in which they abandoned gold. Leaving gold freed central banks to expand money and let prices stop falling. The United States effectively left in 1933, when Roosevelt restricted gold exports, required individuals to turn in most gold coins, bullion and certificates, and, through the Gold Reserve Act of 1934, raised the official price of gold from $20.67 to $35 an ounce. That devaluation coincided with the start of the recovery.

Hoover’s response

Herbert Hoover is often described as a president who did nothing, but he intervened more than any previous president in a downturn. Between 1930 and 1932 he:

• Raised federal spending by about 42%, including public works and the creation of the Reconstruction Finance Corporation in 1932, which lent to banks, railroads and other businesses.
• Signed tax increases, including the Revenue Act of 1932, to pay for new programs and limit the deficit.
• Sharply restricted immigration in 1930, on the reasoning that it would protect jobs for American workers.

Hoover’s central concern was wages. He believed that if wages fell, purchasing power would collapse, so he pressed business leaders to avoid pay cuts and keep prices high. The difficulty was that consumers had lost much of their wealth and income and could not buy goods at those prices.

Economists who are critical of this approach argue that holding wages above what falling prices could support meant that employers cut jobs instead of pay. Real wages for those still working rose while unemployment soared. In this view, Hoover’s wage, price and trade interventions kept the economy from adjusting and moving resources to where they could be used.

Smoot-Hawley and protectionism

To shield domestic producers from cheaper foreign competition, Hoover signed the Smoot-Hawley Tariff Act in June 1930, despite a petition from more than a thousand economists urging a veto. Begun as relief for farmers, the bill grew during congressional bargaining into a broad tariff raising duties on hundreds of imported goods, by one count more than 880 products.

Roughly three dozen countries retaliated with their own barriers. U.S. imports fell from about $1.3 billion in 1929 to about $390 million in 1932, and world trade fell by about two-thirds by 1934. Since trade was a modest share of the U.S. economy, tariffs were not the main cause of the Depression, but they hurt exporters, especially farmers, deepened the global slump and made international cooperation harder while the gold standard was transmitting the crisis between countries.

The New Deal

Franklin D. Roosevelt won the 1932 election by a wide margin and took office in March 1933, at the low point of the banking crisis. His New Deal was a broad series of programs meant to stabilize finance, put people back to work, support farm and industrial prices, and protect households against future shocks. It drew loosely on the idea, later formalized by John Maynard Keynes, that government spending could make up for weak private demand.

Stabilizing the banks

Roosevelt’s first act was a national bank holiday in March 1933, closing all banks for about a week. The Emergency Banking Act allowed examiners to reopen sound banks, and in his first radio “fireside chat” Roosevelt explained the plan directly to the public. When banks reopened, deposits flowed back in.

The Banking Act of 1933, often called Glass-Steagall, separated commercial banking from investment banking and created the Federal Deposit Insurance Corporation. Deposit insurance largely ended the cycle of bank runs that had defined the early 1930s. The Securities Act of 1933 and the Securities Exchange Act of 1934 required disclosure from companies issuing stock and created the Securities and Exchange Commission to regulate markets.

Jobs and public works

Agencies such as the Civilian Conservation Corps, the Public Works Administration, the Works Progress Administration and the Tennessee Valley Authority employed millions of people on dams, bridges, tunnels, roads, schools, parks and rural electrification.

Prices, wages and production controls

The New Deal also tried to lift prices directly. The Agricultural Adjustment Act paid farmers to cut production, which in its early phase meant plowing under crops and slaughtering livestock while many Americans struggled to afford food. The National Industrial Recovery Act let industries set codes on prices, wages and output, a form of government-sanctioned cartel. The Supreme Court struck down the core of the NIRA in 1935.

The safety net and taxes

The Social Security Act of 1935 created old-age pensions, unemployment insurance and aid programs for widows, children and people with disabilities. To pay for New Deal programs, federal taxes roughly tripled between 1933 and 1940, through higher personal and corporate income taxes, excise taxes, estate taxes and an excess profits tax.

Critics note that Roosevelt continued many of Hoover’s interventions on a larger scale, particularly price supports and wage floors, even as he broke with Hoover on gold and on federal relief spending.

Did the New Deal end the Great Depression?

The New Deal produced clear results in some areas. Bank failures nearly stopped after 1933, deposit insurance restored trust in banks, and public confidence improved. Output grew strongly from 1933 to 1937. Yet unemployment stayed in double digits for the rest of the decade, and the recovery was too weak for the New Deal to be credited with ending the Depression on its own.

Economists disagree about why:

• Keynesian view: Federal spending was too small relative to the size of the collapse, and Roosevelt’s concern with balanced budgets kept him from a large enough stimulus.
• Market-adjustment view: Like Hoover, Roosevelt kept prices and wages from falling to levels where markets would clear, delaying the usual recovery.

A 2004 study by UCLA economists Harold Cole and Lee Ohanian estimated that New Deal labor and industrial policies extended the Depression by about seven years. Economic historian Robert Higgs argued that the pace and scope of new rules created “regime uncertainty,” making businesses reluctant to invest or hire. Rutgers law and economics professor Philip Harvey argued that Roosevelt’s main goal was social welfare, not a Keynesian macroeconomic stimulus, so judging the programs only as stimulus misses their purpose.

The 1937 to 1938 relapse

The recovery stalled sharply in 1937. Two policy moves are usually blamed. The Federal Reserve doubled bank reserve requirements between 1936 and 1937, worried about the large excess reserves banks were holding, and the Treasury began sterilizing gold inflows so they would not add to the money supply. At the same time, federal spending was cut and new Social Security payroll taxes began, reducing the deficit. Industrial production dropped steeply and unemployment climbed back toward 19% in 1938.

World War II and the end of the Depression

By employment and output figures, the Depression seems to end abruptly around 1941 to 1942, when the United States entered World War II. The number of unemployed fell from about 8 million in 1940 to just over 1 million in 1943.

That headline improvement overstates the gain in private well-being. More than 16 million Americans served in the armed forces, rationing and shortages lowered the civilian standard of living, and taxes rose sharply to finance the war. One analysis found that private investment fell from $17.9 billion in 1940 to $5.7 billion in 1943 while private-sector production fell by nearly half. Crediting military spending with prosperity is an example of the broken window fallacy: it put people to work, but the output went to the war, not to consumers.

The war did set up the postwar recovery. It created new international trade channels, ended many of the price and wage controls of the 1930s, and left households with large savings. In the first year after the war, private investment rose from $10.6 billion to $30.6 billion, and within a few years the stock market entered a long bull run.

Life during the Great Depression

For ordinary Americans, the Depression meant lost jobs, foreclosed homes and farms, and wiped-out savings at failed banks. Shantytowns of the homeless sprang up on the edges of cities and were nicknamed “Hoovervilles.” Breadlines and soup kitchens, many run by charities and churches, fed people who had no income. Many families took in relatives, moved in search of work, or doubled up in shared housing.

Farm regions were hit twice. Crop prices had been weak through the 1920s, and in the early 1930s severe drought and dust storms on the southern Great Plains, the Dust Bowl, destroyed farmland and pushed hundreds of thousands of people west, many of them to California.

People got by through government relief, community support and thrift: growing their own food, mending clothing and avoiding debt. Many kept those habits for life, distrusting banks and the stock market long after deposit insurance and securities regulation were in place.

Lasting effects and lessons

Many New Deal institutions still exist: Social Security, unemployment insurance, deposit insurance through the FDIC, the SEC and agricultural subsidies. The Depression also changed what the public expects from government. The idea that federal authorities should act in a national economic crisis, which was contested in 1930, became broadly accepted.

The main policy lessons came from what went wrong: central banks should act as lenders of last resort and prevent sharp falls in the money supply; deflation is dangerous; fixed exchange-rate systems can transmit crises; trade wars deepen downturns; and withdrawing support too early, as in 1937, can restart a contraction.

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The Bottom Line

The Great Depression matters to anyone trying to understand how central banks, deposit insurance and market regulation work today. The evidence points to bank failures, a shrinking money supply and gold standard constraints as the forces that turned a stock crash into a decade-long slump. Policymakers still draw on its lessons: prevent sharp falls in money, treat deflation as dangerous, avoid trade wars and keep support in place until recovery holds.