| I don't think it's that simple. Banks bought up a bunch of US treasuries at close to nothing interest rates during the last two years. This is where a bank typically parks their cash reserves because the audit requirements require them to hold a certain amount of cash and cash basically == treasuries. Now they're holding a bunch of treasuries that won't mature for a while. If they simply sold them they'd have to book a bunch of losses (because as rates rose the price of treasurys falls). They don't do that and instead hope holding them to maturity will be fine to service their existing commitments (i.e., pay interest on deposits). The problem is that they bought treasurys that yield close to nothing and they have to make a profit on those and pay out an interest to customers, so they take their cut from the 2% and pay the customers a 0.03% interest on deposits or whatever. The customer sees that their savings account is yielding 0% and they could just go park their money in a money market account that yields ~5% (thanks to overnight rates being that high) and moves their money from their bank to a brokerage account. Bank deposits fall resulting in a standard bank run. Sure well run banks maybe have their risk profile in a better place (didn't actually go out and buy a bunch of 30yr treasurys like SVB did and instead got more short duration stuff) but they can't just pivot to instantly increasing the interest rates to match the money market account and so will continue to bleed deposits. |
You're ignoring Fed Repos. Aka: overnight deposits at the Federal Reserve. Which counts as cash and today is returning 5% APY.
Today, a bank will very strongly consider Fed Repos, because 5% is a much better rate than the rates from 2 years ago (aka: 0% to 0.25%)
---------
This also means that a 10Y bond you bought at like 2% or whatever is making less than Fed Repo overnight deposits today. So banks who are on 5Y, 10Y, or 30Y treasuries are in practice feeling like they've lost a lot of money. (And in SIVB or FRC's case, collapsed in part because of this mismatch, combined with depositor flight).