THERE is a story about a science professor giving a public lecture on the solar system. An elderly lady interrupts to claim that, contrary to his assertions about gravity, the world travels through the universe on the back of a giant turtle. “But what supports the turtle?” retorts the professor. “You can’t trick me,” says the woman. “It’s turtles all the way down.”
The American financial system has started to look as logical as “turtles all the way down” this week. Only six months ago, politicians were counting on Fannie Mae and Freddie Mac, the country’s mortgage giants, to bolster the housing market by buying more mortgages. Now the rescuers themselves have needed rescuing.