By Saloni Sinha ( May 28, 2026, 09:33 GMT | Insight) -- The market in which to assess the alleged harm in Mastercard’s Australian antitrust case is debit-card acceptance services, because least-cost routing intensified competition in ways not seen in the credit card market, a court heard on Thursday. In a Federal Court hearing, economic expert witness Alan Frankel, called by the Australian Competition & Consumer Commission, said that said the introduction of least-cost routing changed the debit card acceptance market into a “broader, more competitive market.” The market in which to assess the alleged harm in Mastercard’s Australian antitrust case is debit-card acceptance services, because least-cost routing intensified competition in ways not seen in the credit-card market, a court heard on Thursday....
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