The U.S. Supreme Court considered appeals by Comcast Corp and Amgen Inc that could help determine what kind of evidence must be presented before companies may be the subject of class-action lawsuits. Monday’s complex arguments gave the court a new opportunity to further limit class actions, which can let large groups of plaintiffs seek larger recoveries at lower cost. Most recently, in June 2011 the court decertified a class of as many as 1.5 million Wal-Mart Stores Inc female workers who accused the world’s largest retailer of bias in pay and promotions, saying they raised too many different claims. In [...]