Following through on reports circulated Monday (Sept. 23), the U.S. Department of Justice filed an antitrust lawsuit against Visa, accusing it of stifling competition in the debit card market and suppressing alternatives.The Tuesday (Sept. 24) complaint alleged that Visa employed exclusionary contracts and anticompetitive practices to maintain its market share dominance, resulting in higher fees for merchants and consumers.In the complaint, filed in the U.S. District Court for the Southern District of New Y ...