American Express Co. chairman Harvey Golub, whose acerbic comments three years ago helped set off a legally troublesome chain of events for MasterCard and Visa, said Monday that changes in the bank-owned associations' membership policies are "inevitable."

"Either through action on the part of member banks or through the courts," Mr. Golub predicted, MasterCard and Visa will not be able to sustain rules that prohibit banks in the United States from offering other brands of credit cards.

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