The effects of monetary policy on stock market bubbles at zero lower bound: Revisiting the evidence

We revisit the results in Gali and Gambetta (2015) by reestimating their time-varying Bayesian VAR model including the shadow rate of Wu and Xia (2016). We found some significant differences when looking at the results during and in the aftermath of the crisis: with the shadow rate, the impact of monetary policy shocks on asset prices becomes negative. There is also a much lower positive impact of monetary policy shocks on bubbles when using the shadow rate. The impact is lower by almost three percentage points.