Homebuyer Activity Picks Up Pace in Mid-September U.S. mortgage rates tumbled this week, posting their largest weekly decline in more than a year and providing a boost to prospective homebuyers. According to Freddie Mac's latest Primary Mortgage Market Survey, the average 30-year fixed-rate mortgage fell to 6.35%, down from 6.50% the previous week, marking the most significant single-week drop since at...