This article shows that the "risk premium" shock in Smets and Wouters (2007) can be interpreted as a structural shock to the demand for safe and liquid assets such as short-term US Treasury securities. Several implications of this interpretation are discussed.

Entrepreneurs need cash to finance their real investments. Since cash is costly to hold, entrepreneurs will underinvest. If entrepreneurs can access financial markets prior to learning about an investment opportunity, they can sell some of their less liquid assets for cash and, as a result,...