In August 2016, the 30-year fixed mortgage rate as reported by the Federal Reserve hit an all-time low of 3.44%. Since then it has risen to its current level of 4.50%. While a 1% increase may appear small, especially at this low level of rates, the rise has begun to adversely affect housing and mortgage activity. After rising 33% and 22% in 2015 and 2016 respectively, total mortgage originations were down -16% in 2017. Further increases in rates will likely begin to weigh on house prices and the broader economy. This article will help quantify the benefit that lower rates played in making houses more affordable over the past few decades. By doing this, we can appreciate how further increases in mortgage rates might adversely affect house prices.