Surprise: 'Toxic' Mortgages Are the Best

A new study from professors at Columbia and NYU finds that the "optimal" mortgage in a perfect world is an option ARM

If you had to name the most toxic, dangerous, foolhardy kind of mortgage loan that exists, you'd very likely pick a pay-option ARM, which lets borrowers get deeper into debt by paying less than the minimum interest they owe each month and adding the unpaid interest to the loan principal. Worse yet, you might say, would be a pay-option ARM with a very high penalty for prepayment so borrowers can't get out of it easily once they're in it. There's a move afoot to ban these worst-of-the-worst loans.

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