当期权的执行价格非常接近标的物的即期价格时，则称该期权处于平价状态。平价期权实际上可以是处于略为价内或价外的状态。
When the strike price of an option is equal to (or nearly equal to) the market price of the underlying security, we call this option is at the money.
你在XYZ公司工作,当前股票价格是每股十美元,他们会给你,平价期权或者价外期权,比如以每股十一美元来购买该股票的期权
You work for XYZ Corporation; the share is trading at $10 a share; they would give you "At the money" Or "Out of the money" Options -say options to buy the stock at $11 a share.
在此理论基础上，平价期权比折价、溢价期权更能体现期权的激励效果，而且在股票市场大幅低于执行价格时，再定价对双方都是有利的。
On the base of this theory, at the money option is better than premium and discounted options; if the stock price below the exercise price, option price is benefit for company and executive.
在假定支付连续的红利率和定期支付的条件下，得到了两种情况下欧式看涨期权与看跌期权的定价公式及其它们之间的平价公式。
Under the hypothesis of continuous dividend, if the continuous dividend rate isp, and regular payment dividend, we get European call and put option pricing formula and their parity.
利用鞅方法得到了欧式未定权益定价的一般公式，欧式看涨期权和看跌期权定价及平价关系。
Using martingale methods, general pricing formula of European contingent claims is derived and European option and put-call parity is analyzed.
利用鞅方法得到了欧式未定权益定价的一般公式，欧式看涨期权和看跌期权定价及平价关系。
Using martingale methods, general pricing formula of European contingent claims is derived and European option and put-call parity is analyzed.
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