MasterCard Inc.'s new tiered interchange rates for domestic automated teller machine withdrawals could severely impact the independent sales organizations that operate networks of cash machines, according to executives.

"MasterCard, which owns the Cirrus network, recently announced that in April of this year it was going to arbitrarily retain a large portion of the interchange previously shared with the ATM ISOs," Darryl Ware, a board member of the National Association of ATM ISOs and Operators, wrote in the organization's newsletter last week.

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