In theory, those products can help investors and companies diversify risk, but they are nearly impossible to value.

理论上，这些金融产品可以帮助投资人和公司分散风险，但是要给这些产品估值几乎是不可能的。

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This paper introduces expected value principle, expected utility principle and prospect theory in decision making under risk.

本文介绍了风险型决策中的期望值原则，期望效用原则和前景理论。

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Extreme value theory (EVT) is one of the best choices, which can effectively forecast and guard against the financial risk.

极值理论(evt)正是这样一种方法，它能有效地预测和防范金融极端风险。

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