if the return is tax exempt, muni bonds would not be desirable due to their low yield as comared with alternative investment in assets that could potentially offer high returns (e.g. equities). Put it differently, when tax is not an issue for investment decision-making, you should focus on (potential) returns of investments.
(muni bonds offer low yield due in part to their tax exempt status, basically, you are "paying" for the tax exempt treatment of your investment in munis through "sacrificing" some yield on them) |