Charge It . . . but Check the Math
Gayle Keck and R. Paul Herman report for the Washington Post on dynamic currency conversion -- where purchases are rung up in US dollars at merchants abroad.
It could be a bad deal. If the transaction is run in dollars, cardholders can get socked with a dismal exchange rate, compared with charges that are processed in the local currency (euros, for example) and converted at or near the interbank clearing rate by Visa or MasterCard.







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