Margin calls were one aspect that magnified the magnitude of the 1929 stock market crash.[1] After that, margin regulations (Regulation T) made the minimum marg

Margin calls were one aspect that magnified the magnitude of the 1929 stock market crash.[1] After that, margin regulations (Regulation T) made the minimum margin rate 50% for stocks, though it appears some brokers may have been increasing margin requirements to near this level before the 1929 crash.[2] 1. http://stocks.fundamentalfinance.com/stock-market-crash-of-1929.php http://stocks.fundamentalfinance.com/stock-market-crash-of-1... 2. https://en.wikipedia.org/wiki/Margin_call https://en.wikipedia.org/wiki/Margin_call