Agency residential MBS issuance in November rose to its busiest level since the start of 2011, but seasonal slowdowns in housing activity and a refinance boom that’s losing steam suggest that the current wave is at or near its peak. Fannie Mae, Freddie Mac and Ginnie Mae generated a total of $114.53 billion in new single-family MBS during November. That was up 11.2 percent from October volume and marked the highest monthly production level since January 2011, when the agencies issued $137.76 billion. But consumer demand for refinance loans has been...(Includes two data charts)