The chart profiles the sudden collapse of the refi market using October and November rates. As Black Knight writes, it looks at the – quite dramatic – effect the mortgage rate rise has had on the population of borrowers who could both likely qualify for and have interest rate incentive to refinance. It finds it was cut in half in just one month.

Some more details from the source:

The results of the U.S. presidential election triggered a treasury bond selloff, resulting in a corresponding rise in both 10-year treasury and 30-year mortgage interest rates

Mortgage rates have jumped 49 BPS in the 3 weeks following the election, cutting the population of refinanceable borrowers from 8.3 million immediately prior to the election to a total of just 4 million, matching a 24-month low set back in July 2015

Though there are still 2M borrowers who could save $200+/month by refinancing and a cumulative $1B/month in potential savings, this is less than half of the $2.1B/ month available just four weeks ago

The last time the refinanceable population was this small, refi volumes were 37 percent below Q3 2016 levels