Stocks dive on new worries about Greek debt

It's amazing how fixated investors have been on the European financial crisis, especially since so much of it is indecipherable. Last week the Dow took off on word of a flimsy agreement to extend a European bailout fund, and today the Dow took a tumble after the Greek prime minister unexpectedly called for a referendum on the debt deal. That raises serious doubts on whether this deal will happen at all - as well as concerns about the prospects of default. All of which would be bad enough. But what's really worrisome is the sense that Europe is essentially out of control and subject to vicissitudes that no one can begin to understand or predict. Anyway, the Dow fell 297 points, or almost 2.5 percent.