Anyone who cares about the health of the US economy should welcome the enactment of the Treasury’s rescue plan for Fannie Mae and Freddie Mac, along with other measures to support the housing market. While there is room for argument about details, the risks to the financial system were too great to allow delay.

No one should suppose, however, that the issue is now satisfactorily resolved, even for the short term. Emergency legislation was necessary because market participants were unwilling to buy Fannie and Freddie’s debt; investors doubted that the government-sponsored enterprises were healthy enough to repay it and did not draw sufficient reassurance from the implicit guarantee of federal support. If their debt proves easier to place now, it is only because this guarantee has been strengthened, not because anything has changed at the GSEs.