Using a New-Keynesian model extended to include credit, money and reserve markets, we examine the dynamics of inflation and output gap under some monetary policy options adopted when the economy is hit by large negative real, financial and monetary shocks. Relaxing the assumption that market interest rates are perfectly controlled by the central bank using the funds rate operating procedure, we have shown that the equilibrium at the zero lower bound on the nominal discount rate is stable (or cyclically stable, depending on monetary and financial parameters) and constitutes a liquidity trap, making the central bank’s communication skills useless in the crisis management. While the quantitative easing policy allows attenuating the effects of crisis, it is not always sufficient to restore the normal equilibrium. Nevertheless, quantitative and credit easing policies coupled with the zero discount rate policy could stabilize the economy and make central bank’s communication potentially credible during the crisis.
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