Brokers had borrowed the money they lent to investors from commercial banks. When investors defaulted on their margin loans, the brokers couldn't pay back the banks. When the banks lost that money, they couldn't fulfill withdrawals for ordinary citizens who had never bought a single share of stock. This led to bank runs, the closing of thousands of financial institutions, and a complete freeze on credit that paralyzed the American economy for a decade. The Legacy: Regulation and Caution
A margin call occurs when the value of a stock drops below a certain point. To protect their loan, the broker demands that the investor immediately deposit more cash or sell the stock to cover the debt.
This "forced liquidation" created a downward spiral that couldn't be stopped. In a single day, billions of dollars in wealth vanished. But the damage wasn't contained to Wall Street. From Wall Street to Main Street buying on margin great depression
In October 1929, the market began to wobble. As prices dipped, thousands of investors received margin calls simultaneously. Because most of these investors had already poured their life savings into the market, they didn't have the cash to satisfy the calls. Their only option was to sell their stocks immediately. Black Tuesday and the Spiral of Liquidation The panic reached its zenith on
The mechanics of margin buying turned a market correction into a total collapse. As people were forced to sell to cover their loans, the massive volume of sell orders drove prices down further. This triggered a second wave of margin calls for other investors, who then had to sell, driving prices down even lower. Brokers had borrowed the money they lent to
In the 1920s, the stock market wasn't just for the elite; it was a national pastime. To make entry easier, brokers offered "margin loans." Here is how the math worked:
The tragedy of buying on margin was that it didn't just ruin the speculators; it broke the banking system. This led to bank runs, the closing of
If the stock price doubled to $2,000, you could sell it, pay back the $900 loan, and walk away with $1,100—nearly a on your initial $100 investment. This "leverage" turned modest savings into overnight fortunes, creating a feedback loop where rising prices attracted more margin buyers, pushing prices even higher. The Rise of the Speculative Bubble