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by Scoundreller 1193 days ago
They can’t touch most of those trillions to cover losses because they have to be 1:1 backed for their customer’s security holdings.

E.g. I have hundreds of thousands of dollars in stocks in my brokerage account, but $100 in uninvested « float ».

They could invest that $100 to make some money for themselves, but that’s where they might be taking some risk. If they screw it up and don’t have my $100 available, they can’t go fractional on my stocks to make up for it.