1# matsuojia
记住那些long short buy sell的图，用图去理解容易的多，包括后面的各种组合

"when you short sell a stock, your broker will lend it to you. The stock will come from the brokerage's own inventory, from another one of the firm's customers, or from another brokerage firm. The shares are sold and the proceeds are credited to your account. Sooner or later, you must "close" the short by buying back the same number of shares (called covering) and returning them to your broker. If the price drops, you can buy back the stock at the lower price and make a profit on the difference. If the price of the stock rises, you have to buy it back at the higher price, and you lose money."
"Most of the time, you can hold a short for as long as you want, although interest is charged on margin accounts, so keeping a short sale open for a long time will cost more. However, you can be forced to cover if the lender wants the stock you borrowed back. "
"Because you don't own the stock you're short selling (you borrowed and then sold it), you must pay the lender of the stock any dividends or rights declared during the course of the loan."
Source: http://www.investopedia.com/univ ... g/shortselling1.asp