Just musing here but....
The front end of the Yen carry collapsed and a significant amount of positioning risked off, but cost-to-carry on the longer duration side of the carry is rising.
If the dollar continues to fall, tightening the spread, maintaining leverage will require that more and more assets are marked to market to satisfy calls.
So, If Jpow cuts the carry will tighten more and margin requirements in the long end will rise. If participants are forced to sell short term paper to cover the rise in cost-to-carry on the long end, liquidity can crunch, breaking the buck, and pushing MMs toward failure.
I think the low RRP balances, in the face of a rapidly falling dollar may indicate that money markets are not carrying a sufficiently liquid buffer and meeting 2a-7 requirements, are more exposed to volatility on short paper. This would increase exposure to a liquidity event and possibly leave money markets unable to meet redemptions and maintain a stable NAV.
I think this may already be in motion as we "return to normal" following the recent shock. But Jerome said "The time has come for policy to adjust", so maybe I'm just an idiot.
@MrZackMorris The man literally always tells y’all to watch your size and and set stops… who cares if he gets in a few days before, if it still runs 50%+ for a few days after😂