Krugman elaborates on the events that made me say yesterday was scary:
The new system was supposed to do a better job of spreading and reducing risk. But in the aftermath of the housing bust and the resulting mortgage crisis, it seems apparent that risk wasn’t so much reduced as hidden: all too many investors had no idea how exposed they were.
And as the unknown unknowns have turned into known unknowns, the system has been experiencing postmodern bank runs. These don’t look like the old-fashioned version: with few exceptions, we’re not talking about mobs of distraught depositors pounding on closed bank doors. Instead, we’re talking about frantic phone calls and mouse clicks, as financial players pull credit lines and try to unwind counterparty risk. But the economic effects — a freezing up of credit, a downward spiral in asset values — are the same as those of the great bank runs of the 1930s.
More details as events warrant.