Unfavorable economics and new regulations appear to have slowed the issuance of jumbo mortgage-backed securities in recent months. New deals from Credit Suisse and Two Harbors Investment suggest that the market could be regaining its legs in September. Mid-way through the third quarter of 2015, only four jumbo MBS had been priced, according to the Inside Mortgage Finance MBS Database. An average of about 11 deals per quarter have been issued in the past year ...