NY Fed, Monetary Policy Transmission and the Size of the Money Market Fund Industry: An Update

“This post updates the findings of our previous work on the relationship between monetary policy, MMF yields, and the size of the MMF industry. During the current tightening cycle, MMF yields have increased by 4.13 percentage points, in line with our previous estimate of the beta on MMF shares between 2002 and 2020; in contrast, deposit rates have remained flat. Moreover, consistent with these results, the AUM of the MMF industry has increased as the Federal Reserve has tightened rates, from $4.31 trillion in April 2022 to $4.62 trillion in January 2023. The relatively small magnitude of this increase in the size of the MMF industry, against a rate hike of 4.25 percentage points, is likely due to a lag with which monetary policy affects investor flows in MMFs; the recent monetary policy tightening, in fact, could lead to a further expansion of the MMF industry in the near future.”