Mortgage demand increased last week
An 'open house' flag is displayed outside a single family home on September 22, 2022 in Los Angeles, California.Allison Dinner | Getty ImagesStress in the banking system turned out to be a boon for the U.S. mortgage market. As investors hid in the relative safety of the bond market, yields moved even lower last week. Mortgage rates followed.Mortgage demand, consequently, rose 2.9% compared with the previous week, according to the Mortgage Bankers Association's seasonally adjusted index. The string of gains, however, could…