With CAPM disposal about systematic risk, this paper presents new expression of cost of capital and gives relationship of levered equity Bata and all-equity Bata;
借助于CAPM对系统性风险的处理，给出了CAPM关于资本成本的新的表达式，得到了股权资本β系数与无负债企业股权资本β系数之间的关系式；
With CAPM disposal about systematic risk, this paper presents new expression of cost of capital and gives relationship of levered equity Bata and all-equity Bata;
借助于CAPM对系统性风险的处理，给出了CAPM关于资本成本的新的表达式，得到了股权资本β系数与无负债企业股权资本β系数之间的关系式；
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