Umm, my search engine says US inflation was 4.7 percent in 2021, 8 in 2022, 4.12 in 2023, 2.9 in 2024, 2.4 this year. Will you choose this in the 4+ percent years too?
Did you also check 7 day yields (interest) in those years? SPAXX is currently 4%. But was 5% in previous years (it holds US treasuries and has a very low expense ratio and holds its NAV)
https://fundresearch.fidelity.com/mutual-funds/summary/31617...