There are very vulnerable groups out there. We found many consumers severely underestimated what their payments would be when they adjusted. Some didn't even know how to calculate what their payments would amount to.

For consumers, it may be waiting to see how the market shakes out a bit before deciding to buy at a price that's at the top of the market, particularly if they have to stretch to do that.

There could be a series of payment shocks.

A lot of borrowers don't understand the risks. There's a danger in treating a mortgage like a credit card.