Las Vegas is at greater risk than other cities that its homeowners will walk away from their mortgages even though they could afford them, according to a study by two Chicago universities. Not only are depressed home prices a contributing factor, but when neighbors and friends see someone they know defaulting on their mortgage, the moral constraints and social stigma are lessened and make it increasingly likely that more foreclosures will result, according to the study by the University of Chicago Booth School of Business and Northwestern University. The study finds that 26 percent of all mortgage defaults are classified ...