Attendees at the ABS East conference sponsored by Information Management Network this week in Miami were more optimistic about the MBS and ABS markets than they have been in some time. So optimistic, in fact, that some industry participants are already concerned about bubbles forming in the still recovering securities markets. “If this conference is any indicator, it looks like everybody feels there’s real vitality,” said Lewis Ranieri, chairman and founding partner of Ranieri Partners. “I haven’t seen a conference like this in quite a while.” Close to 3,000 people attended the event. Jay Steiner, a managing director at Deutsche Bank, noted...