From the Motley Fool:
Congressman Paul E. Kanjorski of Pennsylvania reveals some shocking information regarding a bank run which occured right here and indeed brought this country and the entire world economy to within three hours of complete and systemic financial collapse. In this video, Congressman Kanjorski reveals (at about the 2:15 mark) that the move to raise the move to guarantee money market funds up to $250,000 was an emergency measure to stave off a massive run on the banks that removed $550 billion from the system in a matter of just a couple of hours. Treasury then injected $105 billion to no avail, and shut the system down to prevent a panic continuation of this electronic bank run. By "their" [read Treasury's] estimation, had they not shut it down and issued the guarantee, money market withdrawls would have reached $5.5 trillion by two 'o'clock that afternoon!! He then indicates Treasury's assessment that the run not only would have destroyed the U.S. economy immediately, but would have collapsed the world economy within 24 hours.
Kanjorski: "The Treasury opened its window to help. They pumped a hundred and five billion dollars into the system and quickly realized that they could not stem the tide. We were having an electronic run on the banks. They decided to close the operation, close down the money accounts, and announce a guarantee of $250,000 per account so there wouldn't be further panic and there. And that's what actually happened. If they had not done that their estimation was that by two o'clock that afternoon, five-and-a-half trillion dollars would have been drawn out of the money market system of the United States, would have collapsed the entire economy of the United States, and within 24 hours the world economy would have collapsed.""It would have been the end of our political system and our economic systems as we know it."
Rep. Kanjorski: $550 Billion Disappeared in "Electronic Run On the Banks"
12 minutes ago