The literature develops the theoretical rationale for the Value of Tax Shields (VTS) on the following misguided basis: it uses required rate of return on assets (or WACC) as the discount rate for capitalization, it uses expected rate of return on assets (ROA¯ or ROI¯) as a proxy for WACC, and it is not aware of (1) the influence of the difference between “expected rate of return on equity” and “Required rate of Return On Equity (RROE)” on VTS, (2) the fact that RROE is equity normal profit which is not measurable, (3) the economic content of the weight attached to the VTS capacity, and (4) the co-definition of “tax shield and leverage return.” This paper takes tax shields and leverage return as a system and provides a knife, “interest rate/ROI=Cost/Price”, to slice the VTS capacity into “earned VTS” and “unearned VTS.” Earned VTS is VTS. Unearned VTS is the value of leverage return, because leverage return is tax payable.

The well-known equity home bias has two components: an extensive and intensive margin. Using data on direct stock holdings of U.S. households, we find that the decision to participate in foreign stock markets depends on investor wealth, with richer investors more likely to participate (the extensive margin). We document a new finding: as investor wealth increases, the portfolio share invested in foreign equities tends to decrease (the intensive margin). A noisy rational expectations equilibrium model with wealth heterogeneity, entry costs, and endogenously chosen information processing capacity can generate the new negative relationship and help understand the U.S. household equity home bias along both margins.