It really helps to have a look at the graph: https://fred.stlouisfed.org/series/RRPONTSYD This is clearly the highest level of reverse repo since the program was introduced, by a wide margin. There are three factors behind this: 1. The Treasury has temporarily backed off issuance of short term debt as it drains down an overflowing General Account. https://www.reuters.com/article/us-usa-treasury-liquidity-ex... 2. Ban…
When interest rates are 0% there's nothing stopping them from doing this.