This paper studies the mid-September 2019 stress in U.S. money markets: On September 16 and 17, unsecured and secured funding rates spiked up and, on September 17, the effective federal funds rate broke the ceiling of the Federal Open Market Committee (FOMC) target range. We highlight two...

In this article, we discuss the run on prime money market funds (MMFs) that occurred in March 2020, at the onset of the COVID-19 pandemic, and describe the Money Market Mutual Fund Liquidity Facility (MMLF), which the Federal Reserve established in response to it. We show that the MMLF, like a...

In June 2022, the Federal Reserve started reducing the size of its balance sheet, which had expanded to just under $9 trillion in response to the COVID-19 pandemic. However, whereas banks' reserves at the Federal Reserve have decreased, the investment of money market funds (MMFs) at the Federal...

This paper provides an analytically tractable theoretical framework to study the optimal supply of central bank reserves when the demand for reserves is uncertain and nonlinear. We fully characterize the optimal supply of central bank reserves and associated market equilibrium. We find that the...

Loan funds are open-end mutual funds holding predominantly corporate leveraged loans. We document empirically that loan funds are significantly more susceptible to run risk than any other category of debt funds, including corporate bond funds. Most importantly, we establish a link between loan...

Does the federal funds rate respond to shocks when aggregate reserves are in the trillions of dollars? Has banks' demand for reserves moved over time? We provide a structural time-varying estimate of the slope of the reserve demand curve over 2010-21. We estimate a time-varying vector...