[CFA Level 3] 三级equity market valuation课后一习题 equity, default, 书, instead, valuation

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第七题，我感觉b和c都是对的，题目见下：
the most likely improvement from using yardeni instead of the fed model is that the yardeni model captures
A.a pure equity risk premium
B.a pure default risk premium
C.the effect of long term earnings growth on equity market values
请指教，书上都说了b和c的情况