400
                            1.	Buying Stock on Margin: They made a small cash down payment – as low as 10%
of the price
2.	Lack of New Investors
3.	Over speculation: Instead of investing in the future of the companies whose shares they bought, speculators took risks, that the betting market would continue to climb, thus enabling them to sell the stock and make money quickly
                            What led to the Stock Market Crash?