Long-term U.S. rates on mortgages fell in the week for a second straight week amid continued global economic concerns. Mortgage buyer Freddie Mac said Thursday the average 30-year fixed-rate mortgage dipped to 3.54 percent from 3.60 percent a week ago. That is well below its level a year ago of 4.00 ... » Learn More about Average 30-year mortgage falls to 3.54%