A U.K. law firm has filed for permission to appeal a London judge’s recent decision to dismiss a £14 billion ($US 18 billion) class action lawsuit alleging Mastercard overcharged consumers.

The U.K.’s Competition Appeal Tribunal judge dismissed the lawsuit against Mastercard last month, citing a lack of sufficient evidence showing how businesses passed the fees they pay to accept credit and debit cards on to consumers, and a way to account losses suffered by each of 46 million consumers in the class.

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