At the rate that commodities are reaching parity with stocks, they will quickly become not an option.
在商品率达到于股票持平之际，它们很快将不会成为一种选择。
2
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。
3
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.