How Does Monetary Policy Aect Shadow Bank Money Creation? ∗ Kairong Xiaoy June 17, 2016 Abstract This paper studies the impact of monetary policy on money creation of the shadow banking system. Using the U.S. money supply data over the past thirty years, I nd that shadow banks behave in the opposite way to commercial banks: shadow banks create more money exactly when the Fed tightens monetary policy to reduce money supply. Using a structural model of bank competition, I show that this phenomenon can be explained by clientele heterogeneity between the shadow and commercial banking sector. Monetary tightening allows commercial banks to charge higher prices on their depository services by driving up the opportunity cost of using cash. However, shadow banks cannot do so because their main clientele are more yield-sensitive. As a result, monetary tightening makes shadow bank money cheaper than commercial bank money, which drives marginal depositors of commercial banks to switch to shadow banks. My nding cautions against using monetary tightening to address nancial stability concerns, as it may unintentionally expand the shadow banking sector. ∗I am grateful to my thesis advisors Adlai Fisher, Lorenzo Garlappi, Carolin Pueger, and Francesco Trebbi for their generous support and guidance. I also benet from helpful comments from Markus Baldauf, Paul Beaudry, Jan Bena, Murray Carlson, Ron Giammarino, Will Gornall, Tan Wang, and seminar participants at the University of British Columbia. All errors are my own. ySauder School of Business, University of British Columbia. Email:
[email protected] 1 1 Introduction Economists have traditionally focused on the role of commercial banks in the transmission of monetary policy.