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This was a common way to get rich by investing in the stock market through loans. As loans were easy to obtain, the price of stocks was increased beyond their actual value. Once investors started selling their stocks for high profit, sellers panicked and began to sell in mass, resulting in a rapid decline of stock value. This lead to the collapse of the New York Stock Market, followed by the Toronto and Montreal Stock Markets.
What is "Borrow to Invest" and the role it played in The Depression?