Cheaper money JIN MIN-JI JIN MIN-JI Published January 17, 2023 - 7:10 p.m. A person walks past a banner promoting loans in front of a bank in Seoul on Jan. 17. The Cost of Fund Index (Cofix), which is the reference rate for variable-rate mortgages, fell for the first time in 11 months to 4.29 percent in December. YONHAP mortgage business interest rate cofix money loan korea