Sticky Discount Rates

We show that firms' nominal required returns to capital (i.e., their discount rates) are sticky with respect to expected inflation. Such nominally sticky discount rates imply that increases in expected inflation directly lower firms' real discount rates and thereby raise real investment. We analyze the macroeconomic implications of sticky discount rates using a New Keynesian model. The model naturally generates investment-consumption comovement in response to household demand shocks and higher investment in response to government spending. Sticky discount rates imply that inflation has real effects, even absent other nominal rigidities, making them a distinct source of monetary non-neutrality. At the same time, sticky discount rates make the short-term interest rate less effective at stimulating investment. Optimal monetary policy focuses on inflation expectations and permanently lowers the long-run inflation target in response to expansionary shocks, even when shocks are temporary.