“The policy mix is very much weighted on the side of not lending, or at least not underwriting anything but a prime loan,” according to Chris Whalen, an executive vice president and managing director at Carrington Investment Services. Whalen and others spoke last week at a panel hosted by the American Enterprise Institute. The industry analysts said actions by federal regulators are limiting issuance of non-agency mortgage-backed securities. Tom Zimmerman, a managing director at UBS, said ...