Horses an investor to sell off stocks held in accordance with market conditions, and then buy another stock. Where the shares held rally will do or slow down, savvy investors will seize the opportunity, take advantage of high stock will sell off cash, and then the money into another target on the stock. On the other hand, if some shares held by profit slip, or be affected by other negative factors, investors can sell their shares as soon as possible, then the capital stock exchange to another body. If the vision is accurate, investors can increase returns by horses; of course, if the wrong trend, horses not only have to pay transaction costs and may also incur losses.