An investor, who believes that a stock price has appreciated too far and is likely to decline, may profit from this belief by selling the stock short. In a short sale, the customer borrows the security in order to complete delivery to the buying party. The investor sells the stock high hoping that they can buy it back cheaper and replace it. It is a perfectly legitimate investment strategy. The investor’s first transaction is a sell and they exit the position by repurchasing the stock. The short sale of stock has unlimited risk because there is no limit to how high the stock price may go. The investor will lose money if the stock appreciates past their sales price.