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Antitrust class actions can be huge, complicated, and very expensive. The recent Visa/Mastercard class action arising from alleged fixing of credit card interchange fees has lasted for years and resulted in a $5.7 billion settlement with 12 million retailers — and the case is still not over. Ten of the original 19 named plaintiffs, including retail giants Wal-Mart and Target, opted out of the settlement. Thirty other merchants who opted out commenced a new action against Visa and Mastercard on Jan. 15, 2014, and further litigation is expected.