Preferential corporate income tax treatment: Valuation in the market portfolio

In the setting of the market portfolio, the impacts of preferential corporate income tax treatments through the valuational reduction for risk are opposite to and offset the impacts through the expected proceeds. This suggests that focusing on the absolute valuation of tax-favored firms results in the undermeasurement of implicit taxes on returns on investments in tax-favored firms and the relative valuation with reference to fully taxed (i.e., tax-disfavored) benchmark firms be used. In addition, corporate income taxes imposed on entities and capital income taxes imposed on investors have opposite valuational effects through the endogenously derived market-aggregate aversion to risk.