Home buying got even more affordable this week as mortgage rates continue to break records and increase home buyer affordability. For the fourth consecutive week, 30-year fixed-rate mortgages, the most popular choice of borrowers, reached a new all-time low. They averaged a new record of 3.78 percent while a year ago at this time, 30-year rates averaged 4.60 percent. 15-year fixed-rate mortgages...