Ample Reserves, Hollow Buffers: Reserve Distribution and Policy Incidence in U.S. Banking
Using quarterly US Call Report data from 2001 to 2024, this paper shows that retail-franchise banks can hold thin reserve buffers even in an ample-reserves regime. In 2024:Q4, 39.2 percent of banks and 10.4 percent of deposits sit below the historical ten percent top-tranche benchmark, so aggregate abundance is not a sufficient statistic for reserve-policy incidence.