by Calculated Risk on 3/17/2008 01:14:00 PM

Fortune has a Q&A piece with Professor Krugman: How bad is the mortgage crisis going to get?

Fortune: By year-end, 15 million Americans could have mortgages worth more than the value of their homes. What happens then?

Krugman: Actually, I think home prices will fall enough for us to produce about 20 million people with negative equity. ... if you have negative equity, you can end up being foreclosed on, and then some people will just find it to their advantage to walk away. We're probably heading for $6 trillion or $7 trillion in capital losses in housing. Some fraction of that will fall on owners of mortgages. I still think the estimates people are putting out there - $400 billion or $500 billion in losses - are too low. I think there'll be $1 trillion of losses on mortgage-backed securities showing up somewhere.

Much more in the Q&A.