期权(又称选择权)交易已有几十年的历史,但只在近20多年中才得到较快的发展。期权交易实际上是一种权利买卖。买主买期权并不是买实物,只是买一种权利。这种权利使他可以在一定时期内的任何时候,以事先确定好的价格(协定价格),向期权的卖方购买或出售一定数量的某种股票,不管在此期间该股票的价格如何变动。这个“一定时期”、协定价格和买卖股票的数量和种类都是在期权合同中事先规定的。在期权合同的有效期 Options (also known as options) have been traded for decades, but only in the past more than 20 years have been faster development. Option trading is actually a right to buy and sell. A buyer buys an option is not to buy something, just buy a right. This right allows him to buy or sell a certain amount of a certain stock at a predetermined price (a negotiated price) at any time during a certain period of time, regardless of how the price of the stock changes during the period. The “certain period”, the agreed price, and the quantity and type of stocks bought and sold are pre-defined in the option contract. In the validity period of the option contract