Another antitrust lawsuit has been filed against Visa and MasterCard, one that experts say draws on allegations already brought against the card companies by the U.S. Department of Justice and national retail stores.

The latest attack is on the 1% fee that both associations charge for currency conversion. Consumers incur the fee when they make purchases abroad. The lawsuit - which names Visa International, Visa U.S.A., and MasterCard International - says the fee is unfair because "there is no rational relationship between the additional cost to the defendants of a foreign card charge and the currency conversion fee defendants levy."

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