The Wall Street Crash of 1929, also known as the Stock Market Crash 1929 or the Great Crash, was a major stock market crash that occurred in late October 1929. It started on October 24 ("Black Thursday") and continued until October 29, 1929, when share prices on the New York Stock Exchange collapsed.

It was the most devastating stock market crash in the history of the United States, when taking into consideration the full extent and duration of its after effects.^[1] The crash, which followed the London Stock Exchange's crash of September, signaled the beginning of the 12-year Great Depression that affected all Western industrialized countries.^[2]

The Roaring Twenties, the decade that followed World War I that led to the crash,^[3] was a time of wealth and excess. Building on post-war optimism, rural Americans migrated to the cities in vast numbers throughout the decade with the hopes of finding a more prosperous life in the ever-growing expansion of America's industrial sector.^[4] While American cities prospered, the overproduction of agricultural produce created widespread financial despair among American farmers throughout the decade.^[4] This would later be blamed as one of the key factors that led to the 1929 stock market crash.^[5]

Despite the dangers of speculation, it was widely believed that the stock market would continue to rise forever. On March 25, 1929, after the Federal Reserve warned of excessive speculation, a small crash occurred as investors started to sell stocks at a rapid pace, exposing the market's shaky foundation.^[6] Two days later, banker Charles E. Mitchell announced that his company, the National City Bank, would provide $25 million in credit to stop the market's slide.^[6] Mitchell's move brought a temporary halt to the financial crisis, and call money declined from 20 to 8 percent.^[6] However, the American economy showed ominous signs of trouble:^[6] steel production declined, construction was sluggish, automobile sales went down, and consumers were building up high debts because of easy credit.^[6] Despite all the economic trouble signs and the market breaks in March and May 1929, stocks resumed their advance in June and the gains continued almost unabated until early September 1929 (the Dow Jones average gained more than 20% between June and September). The market had been on a nine-year run that saw the Dow Jones Industrial Average increase in value tenfold, peaking at 381.17 on September 3, 1929.^[6] Shortly before the crash, economist Irving Fisher famously proclaimed, "Stock prices have reached what looks like a permanently high plateau."^[7] The optimism and the financial gains of the great bull market were shaken after a well-publicized early September prediction from financial expert Roger Babson that "a crash was coming". The initial September decline was thus called the "Babson Break" in the press. That was the start of the Great Crash, but until the severe phase of the crash in October, many investors regarded the September "Babson Break" as a "healthy correction" and buying opportunity.

On September 20, the London Stock Exchange crashed when top British investor Clarence Hatry and many of his associates were jailed for fraud and forgery.^[8] The London crash greatly weakened the optimism of American investment in markets overseas.^[8] In the days leading up to the crash, the market was severely unstable. Periods of selling and high volumes were interspersed with brief periods of rising prices and recovery.

Selling intensified in mid-October. On October 24 ("Black Thursday"), the market lost 11 percent of its value at the opening bell on very heavy trading. The huge volume meant that the report of prices on the ticker tape in brokerage offices around the nation was hours late and so investors had no idea what most stocks were actually trading for at the moment, increasing panic. Several leading Wall Street bankers met to find a solution to the panic and chaos on the trading floor.^[9] The meeting included Thomas W. Lamont, acting head of Morgan Bank; Albert Wiggin, head of the Chase National Bank; and Charles E. Mitchell, president of the National City Bank of New York. They chose Richard Whitney, vice president of the Exchange, to act on their behalf.

With the bankers' financial resources behind him, Whitney placed a bid to purchase a large block of shares in U.S. Steel at a price well above the current market. As traders watched, Whitney then placed similar bids on other "blue chip" stocks. The tactic was similar to one that had ended the Panic of 1907. It succeeded in halting the slide. The Dow Jones Industrial Average recovered, closing with it down only 6.38 points for the day. The rally continued on Friday, October 25, and the half-day session on Saturday, October 26, but unlike 1907, the respite was only temporary.

Over the weekend, the events were covered by the newspapers across the United States. On October 28, "Black Monday",^[10] more investors facing margin calls decided to get out of the market, and the slide continued with a record loss in the Dow for the day of 38.33 points, or 13%.

The next day, "Black Tuesday", October 29, 1929, about 16 million shares traded as the panic selling reached its peak. Some stocks actually had no buyers at any price that day.^[11] The Dow lost an additional 30 points, or 12 percent.^{[12][13][14][15]} The volume of stocks traded that day was a record that would not be broken for nearly 40 years.^[13]

On October 29, William C. Durant joined with members of the Rockefeller family and other financial giants to buy large quantities of stocks to demonstrate to the public their confidence in the market, but their efforts failed to stop the large decline in prices. The massive volume of stocks traded that day made the ticker continue to run until about 7:45 p.m. The market had lost over $30 billion in the space of two days, including $14 billion on October 29.^[16]

After a one-day recovery on October 30, when the Dow regained an additional 28.40 points, or 12 percent, to close at 258.47, the market continued to fall, arriving at an interim bottom on November 13, 1929, with the Dow closing at 198.60. The market then recovered for several months, starting on November 14, with the Dow gaining 18.59 points to close at 217.28, and reaching a secondary closing peak (bear market rally) of 294.07 on April 17, 1930. The Dow then embarked on another, much longer, steady slide from April 1930 to July 8, 1932, when it closed at 41.22, its lowest level of the 20th century, concluding an 89 percent loss rate for all of the market's stocks.

For the rest of the 1930s, beginning on March 15, 1933, the Dow began to slowly regain the ground it had lost during the 1929 crash and the three years following it. The largest percentage increases of the Dow Jones occurred during the early and mid-1930s. In late 1937, there was a sharp dip in the stock market, but prices held well above the 1932 lows. The market would not return to the peak closing of September 3, 1929, until November 23, 1954.^[18][19][20]

In 1932, the Pecora Commission was established by the U.S. Senate to study the causes of the crash.^[21] The following year, the U.S. Congress passed the Glass–Steagall Act mandating a separation between commercial banks, which take deposits and extend loans, and investment banks, which underwrite, issue, and distribute stocks, bonds, and other securities.^[22]

After the experience of the 1929 crash, stock markets around the world instituted measures to suspend trading in the event of rapid declines, claiming that the measures would prevent such panic sales. However, the one-day crash of Black Monday, October 19, 1987, when the Dow Jones Industrial Average fell 22.6%, was worse in percentage terms than any single day of the 1929 crash (although the combined 25% decline of October 28–29, 1929 was larger than that of October 19, 1987, and remains the worst two-day decline ever).^[23]

The American mobilization for World War II at the end of 1941 moved approximately ten million people out of the civilian labor force and into the war.^[24] World War II had a dramatic effect on many parts of the economy, and may have hastened the end of the Great Depression in the United States.^[25] Government-financed capital spending accounted for only 5 percent of the annual U.S. investment in industrial capital in 1940; by 1943, the government accounted for 67 percent of U.S. capital investment.^[25]

The crash followed a speculative boom that had taken hold in the late 1920s. During the latter half of the 1920s, steel production, building construction, retail turnover, automobiles registered, and even railway receipts advanced from record to record. The combined net profits of 536 manufacturing and trading companies showed an increase, in the first six months of 1929, of 36.6% over 1928, itself a record half-year. Iron and steel led the way with doubled gains.^[26] Such figures set up a crescendo of stock-exchange speculation that led hundreds of thousands of Americans to invest heavily in the stock market. A significant number of them were borrowing money to buy more stocks. By August 1929, brokers were routinely lending small investors more than two-thirds of the face value of the stocks they were buying. Over $8.5 billion was out on loan,^[27] more than the entire amount of currency circulating in the U.S. at the time.^[16][28]

The rising share prices encouraged more people to invest, hoping the share prices would rise further. Speculation thus fueled further rises and created an economic bubble. Because of margin buying, investors stood to lose large sums of money if the market turned down—or even failed to advance quickly enough. The average P/E (price to earnings) ratio of S&P Composite stocks was 32.6 in September 1929,^[29] clearly above historical norms.^[30] According to economist John Kenneth Galbraith, this exuberance also resulted in a large number of people placing their savings and money in leverage investment products like Goldman Sachs' "Blue Ridge trust" and "Shenandoah trust". These too crashed in 1929, resulting in losses to banks of $475 billion 2010 dollars ($545.75 billion in 2018).^[31]

Good harvests had built up a mass of 250 million bushels of wheat to be "carried over" when 1929 opened. By May there was also a winter-wheat crop of 560 million bushels ready for harvest in the Mississippi Valley. This oversupply caused a drop in wheat prices so heavy that the net incomes of the farming population from wheat were threatened with extinction. Stock markets are always sensitive to the future state of commodity markets, and the slump in Wall Street predicted for May by Sir George Paish arrived on time. In June 1929, the position was saved by a severe drought in the Dakotas and the Canadian West, plus unfavorable seed times in Argentina and eastern Australia. The oversupply would now be wanted to fill the big gaps in the 1929 world wheat production. From 97¢ per bushel in May, the price of wheat rose to $1.49 in July. When it was seen that at this figure American farmers would get rather more for their smaller crop than for that of 1928, stocks went up again.

In August, the wheat price fell when France and Italy were bragging of a magnificent harvest, and the situation in Australia improved. That sent a shiver through Wall Street and stock prices quickly dropped, but word of cheap stocks brought a fresh rush of "stags", amateur speculators and investors. Congress voted for a $100 million relief package for the farmers, hoping to stabilize wheat prices. By October though, the price had fallen to $1.31 per bushel.^[32]

Other important economic barometers were also slowing or even falling by mid-1929, including car sales, house sales, and steel production. The falling commodity and industrial production may have dented even American self-confidence, and the stock market peaked on September 3 at 381.17 just after Labor Day, then started to falter after Roger Babson issued his prescient "market crash" forecast. By the end of September, the market was down 10% from the peak (the "Babson Break"). Selling intensified in early and mid October, with sharp down days punctuated by a few up days. Panic selling on huge volume started the week of October 21 and intensified and culminated on October 24, the 28th, and especially the 29th ("Black Tuesday").^[33]

The president of the Chase National Bank, Albert H. Wiggin, said at the time:

Together, the 1929 stock market crash and the Great Depression formed the largest financial crisis of the 20th century.^[36] The panic of October 1929 has come to serve as a symbol of the economic contraction that gripped the world during the next decade.^[37] The falls in share prices on October 24 and 29, 1929 were practically instantaneous in all financial markets, except Japan.^[38]

The Wall Street Crash had a major impact on the U.S. and world economy, and it has been the source of intense academic historical, economic, and political debate from its aftermath until the present day. Some people believed that abuses by utility holding companies contributed to the Wall Street Crash of 1929 and the Depression that followed.^[39] Many people blamed the crash on commercial banks that were too eager to put deposits at risk on the stock market.^[40]

In 1930, 1,352 banks held more than $853 million in deposits; in 1931, one year later, 2,294 banks went down with nearly $1.7 billion in deposits. Many businesses failed (28,285 failures and a daily rate of 133 in 1931).

The 1929 crash brought the Roaring Twenties to a halt.^[41] As tentatively expressed by economic historian Charles P. Kindleberger, in 1929, there was no lender of last resort effectively present, which, if it had existed and been properly exercised, would have been key in shortening the business slowdown that normally follows financial crises.^[38] The crash instigated widespread and long-lasting consequences for the United States. Historians still debate whether the 1929 crash sparked the Great Depression^[42] or if it merely coincided with the bursting of a loose credit-inspired economic bubble. Only 16% of American households were invested in the stock market within the United States during the period leading up to this depression, suggesting that the crash carried somewhat less of a weight in causing it.

However, the psychological effects of the crash reverberated across the nation as businesses became aware of the difficulties in securing capital market investments for new projects and expansions. Business uncertainty naturally affects job security for employees, and as the American worker (the consumer) faced uncertainty with regards to income, naturally the propensity to consume declined. The decline in stock prices caused bankruptcies and severe macroeconomic difficulties, including contraction of credit, business closures, firing of workers, bank failures, decline of the money supply, and other economically depressing events.

The resultant rise of mass unemployment is seen as a result of the crash, although the crash is by no means the sole event that contributed to the depression. The Wall Street Crash is usually seen as having the greatest impact on the events that followed and therefore is widely regarded as signaling the downward economic slide that initiated the Great Depression. True or not, the consequences were dire for almost everybody. Most academic experts agree on one aspect of the crash: It wiped out billions of dollars of wealth in one day, and this immediately depressed consumer buying.^[42]

The failure set off a worldwide run on US gold deposits (i.e. the dollar), and forced the Federal Reserve to raise interest rates into the slump. Some 4,000 banks and other lenders ultimately failed. Also, the uptick rule,^[43] which allowed short selling only when the last tick in a stock's price was positive, was implemented after the 1929 market crash to prevent short sellers from driving the price of a stock down in a bear raid.^[44]

The stock market crash of October 1929 led directly to the Great Depression in Europe. When stocks plummeted on the New York Stock Exchange, the world noticed immediately. Although financial leaders in the United Kingdom, as in the United States, vastly underestimated the extent of the crisis that would ensue, it soon became clear that the world's economies were more interconnected than ever. The effects of the disruption to the global system of financing, trade, and production and the subsequent meltdown of the American economy were soon felt throughout Europe.^[45]

In 1930 and 1931, in particular, unemployed workers went on strike, demonstrated in public, and otherwise took direct action to call public attention to their plight. Within the UK, protests often focused on the so-called Means Test, which the government had instituted in 1931 to limit the amount of unemployment payments made to individuals and families. For working people, the Means Test seemed an intrusive and insensitive way to deal with the chronic and relentless deprivation caused by the economic crisis. The strikes were met forcefully, with police breaking up protests, arresting demonstrators, and charging them with crimes related to the violation of public order.^[45]

There is ongoing debate among economists and historians as to what role the crash played in subsequent economic, social, and political events. The Economist argued in a 1998 article that the Depression did not start with the stock market crash,^[46] nor was it clear at the time of the crash that a depression was starting. They asked, "Can a very serious Stock Exchange collapse produce a serious setback to industry when industrial production is for the most part in a healthy and balanced condition?" They argued that there must be some setback, but there was not yet sufficient evidence to prove that it would be long or would necessarily produce a general industrial depression.^[47]

However, The Economist also cautioned that some bank failures were also to be expected and some banks may not have had any reserves left for financing commercial and industrial enterprises. It concluded that the position of the banks was the key to the situation, but what was going to happen could not have been foreseen.^[47]

Some academics view the Wall Street Crash of 1929 as part of a historical process that was a part of the new theories of boom and bust. According to economists such as Joseph Schumpeter, Nikolai Kondratiev and Charles E. Mitchell, the crash was merely a historical event in the continuing process known as economic cycles. The impact of the crash was merely to increase the speed at which the cycle proceeded to its next level.

Milton Friedman's A Monetary History of the United States, co-written with Anna Schwartz, advances the argument that what made the "great contraction" so severe was not the downturn in the business cycle, protectionism, or the 1929 stock market crash in themselves but the collapse of the banking system during three waves of panics from 1930 to 1933.^[48]