On Thursday Sept 15, 2008 at roughly 11 AM The Federal Reserve noticed a tremendous draw down of money market accounts in the USA to the tune of $550 Billion dollars in a matter of an hour or two.
Money was being removed electronically.
The treasury tried to help with $105 Billion.
But could not stem the tide.
It was an electronic run on the banks
The treasury intervened but had they not closed down the accounts they estimated that by 2 PM that afternoon. Within 3 hours. $5.5 Trillion would have been withdrawn and collapsed and within 24 hours the world economy.