Fannie Mae and Freddie Mac late this year will raise guaranty fees on single-family mortgages by another 10 basis points, under a directive that the government-sponsored enterprises’ conservator announced late last week. The g-fee increases will be effective on Dec. 1, 2012, for loans exchanged for mortgage-backed securities, and on Nov. 1, 2012, for loans sold for cash. According to FHFA Acting Director Edward DeMarco, who telegraphed the move in a notification to Congress earlier this summer, the g-fee increases are designed...