Fannie Mae and Freddie Mac had markedly different experiences in November in terms of new single-family business activity. Issuance of Fannie mortgage-backed securities fell 25.9 percent from October to November, while Freddie production soared 13.6 percent higher, according to a new Inside The GSEs analysis and ranking. The most likely explanation for the divergence is that Freddie had more business days in which November MBS were issued. Both GSEs observed two legal holidays – Veterans Day and Thanksgiving – which knocked the number of business days down to 20 last month. But Fannie also took off the day after Thanksgiving in terms of new MBS issuance, while Freddie kept the machinery running. And although mortgage sellers set up new...