The European Central Bank published Working Paper 'Stablecoins, money market funds and 'monetary policy'.
This paper documents the distinction between stablecoins and money market funds (MMFs), namely their "different response to crypto and U.S. monetary policy shocks since 2019."
Drawing on a new series of crypto market shocks and a standard measure of monetary policy shocks, the paper shows that crypto shocks are "inconsequential for MMFs and traditional financial markets" but "negatively affect stablecoins."
In contrast, U.S. monetary policy shocks "significantly affect MMFs... and stablecoins, but in opposite directions. While prime MMF assets grow after contractionary monetary policy shocks, stablecoin market capitalization significantly declines."