Valve at Risk is unable to measure the risk exactly and lack of subadditive.

基于风险价值不能准确度量风险以及缺乏次可加性。

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At last, as valve at Risk is unable to measure the risk exactly and lack of subadditive , therefore, it is suggested in the international that Expected shortfall should be used to measure risk.

基于风险价值不能准确度量风险以及缺乏次可加性这些缺点，目前国际上有人提出用损失期望值来测量风险。

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