no one said those things caused, it was HIS REFUSAL TO REGULATE THE STOCK MARKET.
I knew there are people who think regulating the stock market would have stopped the Great Depression, but I didn't know there were people who actually thought not regulating it was the CAUSE.
There was definitely one thing going on in the stock market which created high risk and undoubtedly made the crash much worse. People were able to buy stock on margin, by paying only 10% down and borrowing the rest from the broker. That makes for a highly leveraged investment. If the stock goes up 10% you make a 100% return. Thats pretty nifty, but it works the other way if the price goes down 10%. In that case you lose 100% of your investment, and if it goes down more than 10% you lose more than you invested.
Today you can only borrow about 30% of the stocks price. If the stock goes down 30% you will get a call from your broker demanding more money or sell the stock. Personally I think margin trading is still very risky and I don't recommend it.