.21 12.R.3.C 界定系统风险和非系统风险（Systematic and Unsystematic risk）并说明为什么投 资者不能因承担非系统风险而获得额外补偿..
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林业股票投资的风险包括系统风险和非系统风险。
Risk of forestry stock investment include system and non-system risk.
单因素模型认为，股票的收益率可以由系统风险和非系统风险联合解释，但它把系统风险限制在一个因素（如市场指数）当中。
The single-factor model thinks, the rate of return of the stock can be explained with system risk and none system risk together, but it limits the system risk in a factor (such as market index).
为了使当前流行的各种信用风险模型具有更高的相容性，在系统风险因素和非系统风险因素区别的基础上，建立了一个简单的信用组合风险模型。
In order to make popular credit risk models more compatibility, we expect to set up a general credit portfolio modeling, which is a basis of system risk factors and non-system risk factors.
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