We study the e¤ects of in ‡ation in a monetary model extended to incorporate both household production and endogenous investment in housing. As long as cash is used in market transactions, in ‡ation is a tax on market activity, but not on home production. In ‡ation thus causes substitution out of market and into household activity, encouraging investment in household capital, including housing. We show analytically that through this channel, in ‡ation increases the value of housing scaled by either nominal output or the money supply. We document these relationships in the data, and investigate how a calibrated model can account for the facts.