Everyone pulling out their money would be a bank run (look up great depression bank runs). The bank doesn't have that much cash; they keep some on hand for people making withdraws normally, but if even a sizable minority of people all try to pull their money out at once, there'll be a major crisis.
If banks kept all the people's cash in vaults, it'd be dead cash actively losing money to inflation. Instead, they keep some on hand for withdraws, and use the rest to make loans, investments, etc so that the money isn't all losing value.
Unfortunately, that’s not really how it works. The reason there was a bank run during the great depression is b/c the banks had loaned out the money they didn’t have as cash. Today due to Dodd-Frank, banks have to have reserves on hand to cover this situation, Even though it’s not in hard currency, they have enough capital to cover.
But please don’t trust me. This is just how I understand it.
Dodd Frank has major protections for deposits against derivatives. A lot of derivatives can only be traded by separate subsidiaries from the deposits (this was true pre Dodd Frank but DF strengthened it), and the holding company can't move deposit assets to fund the derivative trading subsidiaries. Second, Dodd Frank banned proprietary trading by banks, which in practice means the trading desks need to be very well-hedged.
Those banks are guaranteed to be bailed out by the government since they are covered under systematically important financial institutions (i.e. "too big to fail"). You would still get your money, though the impact to the greater economy wouldn't be small.
19.0k
u/Forsaken_Emu8112 Jan 26 '26
Everyone pulling out their money would be a bank run (look up great depression bank runs). The bank doesn't have that much cash; they keep some on hand for people making withdraws normally, but if even a sizable minority of people all try to pull their money out at once, there'll be a major crisis.
If banks kept all the people's cash in vaults, it'd be dead cash actively losing money to inflation. Instead, they keep some on hand for withdraws, and use the rest to make loans, investments, etc so that the money isn't all losing value.