The Federal Housing Finance Agency “should not appreciably change” guaranty fees charged by Fannie Mae and Freddie Mac, according to a new paper by Moody’s Analytics. The paper, “A General Theory of G-Fees,” by Mark Zandi, chief economist at Moody’s Analytics, and Cristian deRitis, a senior director of consumer credit analytics, noted that the two GSEs are currently charging an average g-fee of approximately 60 basis points across all new loans they insure.