Retailers' rebellion against bank card industry pricing could take forms even more militant than the pending antitrust lawsuit against MasterCard and Visa, retail industry executives warned last week.

With the card associations' interchange rates-the basis for the processing discounts that banks collect from merchants-set to increase next month, resentment is rising in the retailing community. It has been simmering for years, has boiled over in the lawsuit challenging the prices charged on debit card transactions, and prompted several caustic comments during a panel discussion at the annual Star System member meeting in San Diego.

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