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。

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The BBC's religious affairs correspondent, Robert Pigott, accepts that Ekklesia's call for parity for the white poppy is provocative.

BBC: NEWS | UK | Red poppy 'less Christian' claim

In other words, put open interest is nearly in parity with call open interest in the December series.

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My call for the pound and the euro to go to parity with the dollar would be out the window for some time, and maybe for good.

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