Here is how the short-selling game is played:
stock prices are set by traders whose job is to match buyers with sellers. Short sellers willing to sell at any price are matched with the low-ball buy orders. When sell orders overwhelm buy orders, the price drops. The short sellers then buy the stocks back at the lower price and pocket the difference. Today, speculators have to drop the price only enough to trigger the automatic stop loss orders and margin calls of the big mutual funds and hedge funds. A cascade of sell orders follows, and the price plummets
by Ellen Brown Civil litigation attorney; author, 'Web of Debt'