After watching an infomercial, Harry Wiedenbeck bought a "comprehensive" medical health insurance plan for himself and his wife. When the insurer subsequently denied a claim based on his wife’s hospitalization, Mr. Wiedenbeck filed a class action alleging fraud and bad faith on behalf of all Wisconsin residents who had bought the plan.

The subsequent case

 In Basic, Inc. v. Levinson, the Supreme Court recognized a rebuttable presumption of fraud on the market for securities-fraud cases. That presumption allowed for certification of a number of securities class actions. Plaintiffs since have taken that presumption and tried to apply it to various other sets of facts, most notably tobacco (although