Why are homeowners reluctant to walk away from underwater mortgages?

Especially in states like Arizona and California, where mortgages are nonrecourse loans, which cost more because they are easier to walk away from ($800 for each $100,000 borrowed).

Morality aside, there are other factors deterring “strategic defaults,” whether in recourse or nonrecourse states. These include the economic and emotional costs of giving up one’s home and moving, the perceived social stigma of defaulting, and a serious hit to a borrower’s credit rating. Still, if they added up these costs, many households might find them to be far less than the cost of paying off an underwater mortgage.

An important implication is that we could be facing another wave of foreclosures, spurred less by spells of unemployment and more by strategic thinking. Research shows that bankruptcies and foreclosures are “contagious.” People are less likely to think it’s immoral to walk away from their home if they know others who have done so. And if enough people do it, the stigma begins to erode.