The Transmission of Monetary Policy through Bank Lending: The Floating Rate Channel

We describe and test a mechanism through which outstanding bank loans affect the firm balance sheet channel of monetary policy transmission. Unlike other debt, most bank loans have floating rates mechanically tied to monetary policy rates. Hence, monetary policy-induced changes to floating rates affect the liquidity, balance sheet strength, and investment of financially constrained firms that use bank debt. We show that firms---especially financially constrained firms---with more unhedged bank debt display stronger sensitivity of their stock price, cash holdings, sales, inventory, and fixed capital investment to monetary policy. This effect disappears when policy rates are at the zero lower bound, which further supports the floating rate mechanism and reveals a new limitation of unconventional monetary policy. We argue that the floating rate channel can have a significant macroeconomic effect due to the large size of the aggregate stock of unhedged floating-rate business debt, an effect at least as important as the bank lending channel through new loans.