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。

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

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该方法既克服了期望值-差法和夏普指数法的不足，又在一定程度上避免了效用函数构造的困难。

The new method has overcomed the shortcomings of the Expectation-Variance method and Sharpe's Index method, and avoids the inconvenience of constructing utility function to a certain extent as well.

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该方法既克服了期望值-差法和夏普指数法的不足，又在一定程度上避免了效用函数构造的困难。

The new method has overcomed the shortcomings of the Expectation-Variance method and Sharpe's Index method, and avoids the inconvenience of constructing utility function to a certain extent as well.

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