Can sell the securities in a securities price range (Short Position). Without the need to have the securities are then sold securities to accommodate the advance back when that particular stock price decrease.
Securities available for sale securities during the period of high prices (Short Position) without the need to have security. Already to buy back the securities at a pre-sale securities when prices declined.
Can sell securities in the securities prices are high (Short Position) without the need to have such securities Already went to Shi securities sold in advance back when the stock price that decreased.