TY - JOUR AU - Gali, Jordi AU - Gambetti, Luca TI - The Effects of Monetary Policy on Stock Market Bubbles: Some Evidence JF - National Bureau of Economic Research Working Paper Series VL - No. 19981 PY - 2014 Y2 - March 2014 DO - 10.3386/w19981 UR - http://www.nber.org/papers/w19981 L1 - http://www.nber.org/papers/w19981.pdf N1 - Author contact info: Jordi Galí Centre de Recerca en Economia Internacional (CREI) Ramon Trias Fargas 25 08005 Barcelona SPAIN Tel: 011-34-93-5422754 Fax: 011-34-93-5421860 E-Mail: jgali@crei.cat Luca Gambetti Collegio Carlo Alberto Università di Torino E-Mail: luca.gambetti@uab.cat M1 - published as Jordi Galí, Luca Gambetti. "The Effects of Monetary Policy on Stock Market Bubbles: Some Evidence," in Mark Gertler, organizer, "Lessons from the Financial Crisis for Monetary Policy" American Economic Journal: Macroeconomics, Volume 7, no. 1 (2015) M3 - presented at "Lessons from Financial Crisis for Monetary Policy", October 18-19, 2013 AB - We estimate the response of stock prices to exogenous monetary policy shocks using a vector-autoregressive model with time-varying parameters. Our evidence points to protracted episodes in which, after a short-run decline, stock prices increase persistently in response to an exogenous tightening of monetary policy. That response is clearly at odds with the "conventional" view on the effects of monetary policy on bubbles, as well as with the predictions of bubbleless models. We also argue that it is unlikely that such evidence be accounted for by an endogenous response of the equity premium to the monetary policy shocks. ER -