Usually, when you have a stock market mania, it's driven largely by individual investors borrowing money to buy stocks at prices that are too high. And usually, when a bubble becomes unwound, it's because of margin calls.  -   Hugh Johnson     Quotes
Usually, when you have a stock market mania, it's driven largely by individual investors borrowing money to buy stocks at prices that are too high. And usually, when a bubble becomes unwound, it's because of margin calls. Hugh Johnson
 Borrowing