This has tricky policy implications. The supply of credit--for which interest rates are usually a good proxy--has huge effects on home prices in this world of majority mortgage financing. We've pushed interest rates down as far as they're going to go, but that's not going to reinflate the bubble. So huge numbers of people who have income shocks are going to end up in foreclosure unless their bank allows a short sale.
But what's the alternative? Huge write-downs to the mortgage principal of everyone who gets in trouble? They'll still have to sell the house in a lousy market. And it makes the banks more fragile, while unfairly handing a giant subsidy to those who happen to lose their jobs.
On the other hand, it does mitigate the claim that this is about irresponsible borrowing--at least in a lot of markets. In places like California and Florida, where prices of large houses have dropped 30-50%, the most sensible downpayment policies wouldn't have kept people from going underwater. Though to be fair, highly insensible downpayment policies helped inflate the bubble, and a lot of people with tiny downpayments are getting themselves in trouble.
This article available online at:
http://www.theatlantic.com/business/archive/2009/05/facing-foreclosure/17275/
