Since the RRP hike meant the GC rate would also have to increase, we noted last night that "with both market rates and RRP at .05%, there's really no economic incentive for cash investors to move cash to the Repo market."
Furthermore, now that the Fed is actually paying counterparties a modest but non-negligible 5bps on reserve deposits, it has made the RRP even more attractive compared to when it paid nothing (when the RRP rate was 0.0%), as it now generates a higher risk free yield than many short-term Bills.
As such, we concluded that if it was the Fed's intention to reduce participation in its Reverse Repo facility (which the Fed specifically expanded back in March knowing what was coming) it would fail.
And wow, did it fail: moments ago we got the first Reverse Repo results from the new post-FOMC regime, and boy was it a whopper: coming at $755.8 Billion among 68 counterparties, there was a tsunami of new reserves parked at the Fed, as the total was a massive $235 billion more compared to the $520.9BN (among 53 counterparites) yesterday, the biggest one-day increase on record as every Tom, Dick and Harry rushed to collect the Fed's free pennies.
One explanation for the surge is that as UBS noted earlier, the Fed's adjustment "is likely to make the RRP grow even more, in part due to new usage by GSEs who can now earn more than the zero they get on their deposits at the Fed." That, UBS added, takes reserves out of the banking system, which should slightly reduce the odds of balance sheet stress at year-end." Separately, since this is the first TOMO with the new 5bps RRP rate, we could be seeing a temporary spike as market rates adjust to the new lower bound.