This study models the bid-ask spread in financial markets as a function of asset price variability and order flow. The market-maker is characterized as passively accepting orders to buy and to sell a security at the market's prevailing price (plus or minus half the bid-ask spread). The bid-ask...

We determine optimal monetary policy under commitment in a forward-looking New Keynesian model when nominal interest rates are bounded below by zero. The lower bound represents an occasionally binding constraint that causes the model and optimal policy to be nonlinear. A calibration to the U.S....

Theoretical and empirical models of investment spending have treated financial structure very differently. Recent research has begun to narrow this gap and, based on developments in the economics of information, has drawn theoretical links between investment spending and the frictions and...

It is a puzzling fact that many central banks choose to lend intra-day funds at an interest rate of zero (or very close to zero), while the interest rate on overnight funds is much higher. I build a general equilibrium model where intra-day liquidity is needed because it is costly to make...

Ignoring the existence of the zero bound on nominal interest rates one considerably understates the value of monetary commitment in New Keynesian models. A stochastic forward-looking model with an occasionally binding lower bound, calibrated to the U.S. economy, suggests that low values for the...

In this paper I ask whether a central bank policy of providing liquidity to banks during panics can prevent bank runs without causing moral hazard. This kind of policy has been widely advocated, most notably by Bagehot (1873). To analyze such a policy, I build a model with three key features: 1)...

Bagehot (1873) states that in order to prevent bank panics a central bank should provide liquidity to the market at a "very high rate of interest". This seems to be in sharp contrast with the policy adopted by the Federal Reserve after September 11 when, for a few days, the Federal Funds Rate...