The Federal Housing Finance Agency so far has resisted calls to lower guaranty fees charged by Fannie Mae and Freddie Mac and quietly set a “minimum base guaranty fee” for the two government-sponsored enterprises. The FHFA directive was revealed in the 10-Q filings issued by the two GSEs this week accompanying second-quarter financial results that showed a combined $3.94 billion in net income. Their Securities and Exchange Commission filings, however, provided little detail about what the minimum base fee is. “In July 2016,” Fannie’s 10-Q states...