The video outlines a scenario where lower teaser or piggy back...

The video outlines a scenario where lower teaser or piggy back rates were offered to Americans to take out mortgages. The fed then raised rate 17 times and those mortgages' rates went up with the fed's rates.

I would find it hard to fathom that banks decided to be altruistic with their lending rates by locking in mortgages at the record low rate. Perhaps there will be a large portion of Americans that find themselves in the exact same position. I think this time though Yellen has an idea just how bad it is out there.