Under new currency laws that took effect last month along the Mexican Riviera and elsewhere, restaurants, stores and other businesses can now accept a maximum of $100 in cash per transaction. Tour operators Apple Vacations and Funjet Vacations are warning customers that "certain businesses may not be able to, or may choose not to, accept U.S. dollars for any purchase at all, " and airlines at Mexican airports can no longer accept U.S. cash for checked bag fees or other charges, says Tim Smith at American Airlines.

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