It refers broker unfair way to make the difference in the price of food practices. Brokers such as customer acceptance of the buying commission, responsible for a broker to buy or sell should be the first time for the guests. But some unscrupulous brokers, if they feel the broader market weakness, the stock will fall, they deliberately delay-off times, to be commissioned by the stock price drop when only in his own name or loved ones to buy the same number of shares, then the higher the price of the transfer to its customers, which get a premium, what we called the "rip." If the stock price prediction error, the results rose, he said customers can not buy the stock; and if the client is a market order off the plate, he can use higher prices to buy shares, resulting in the loss of customers.