Second, I've chosen a 5-year old analysis of mortgage lending specifically because the Alt-A (no documentation) and Option-ARM (negative amortization) loans discussed by the Economist commonly sported reset dates 5 years into the loan terms. So the observation that "payments surge as principal repayment kicks in" is not an event that was occurring then. Rather, it is an event that has just begun to occur with loans now hitting their resets. And while current ARM interest rates are only about 4.5%, these mortgages now demand a combination of interest plus principal repayment, on a loan balance that is most likely well above the current market value of the home. This is likely to be onerous relative to a previous payment that was less than the interest alone.