Therefore, the downside risk seems to be more appropriate for measuring risk. But the partial nature of downside risk which assigns neutrality to returns above target rate does not capture the pursuits of better investment opportunities by most investors. 因此,下方风险似乎更适合于度量风险,然而,下方风险默认投资者对超过目标收益率时是风险中性的,这种本质上的不完全性无法反映投资者对更好的投资机会的追逐。
Secondly, briefly introduced the current three kind of Real Option pricing method& Partial Differential Equation, Dynamic Programming Approach, and Simulations, and carried on the adjustment and the revision of the Option Pricing Model from the view of duplication error and the risk neutrality supposition. 然后简要介绍了当前实物期权的三种定价方法&偏微分法、动态规划法和模拟法,并从复制误差和风险中性假设两个角度对定价模型进行了调整和修正。