For municipalities struggling to get their finances in order and for the professionals who oversee their investments, the battle being waged in Washington over the federal debt ceiling has become an urgent source of worry. MIT Sloan Professor Andrew Lo provides his input, saying "Any time you have any kind of coordinated divestiture, there's alwasy the risk of a panic and a bank run, but instead of a run on a bank, it's going to be a run on money market funds."