A market is fair is that the market exists the equivalent martingale measure.

市场是公平的是指市场存在等价鞅测度。

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Then, for a given equivalent martingale measure, the optimal stopping problem of the permanent American option is solved.

本文在一个合适的等价鞅测度下，给出了带有事件风险的永久美式期权的定价及其最优停时。

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In the option pricing with martingale way, the most important aspect is finding the equivalent martingale measure to make the discounted stock price process become martingale.

在期权定价的鞅方法中最重要是找到等价鞅测度，使得贴现的股票价格过程是鞅。

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Then by the new rule, a martingale measure was found, and sufficient conditions for the existence of a unique equivalent martingale measure that minimizes the symmetric entropy was given.

利用这一新的准则，确定了鞅测度，提供了存在惟一最小对称熵鞅测度的充分条件。

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Then by the new rule, a martingale measure was found, and sufficient conditions for the existence of a unique equivalent martingale measure that minimizes the symmetric entropy was given.

利用这一新的准则，确定了鞅测度，提供了存在惟一最小对称熵鞅测度的充分条件。

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