The state of the U.S. economy has given the Fed confidence to increase interest rates for the better part of two years. As recently as June 2017, the average rate on a 30-year fixed mortgage rested at 3.9%. Today, the rate on 30-year fixed mortgages has jumped to 5.04%. In 2018 alone, the interest rate on 30-year fixed mortgages has jumped slightly more than a point, but I...