Abstract
Working paper.We examine deviations from the law of one price (LOP) with price data from duty-free outlets where each product, at a given location, has its price quoted in (at least) two currencies. Reluctance to adjust relative prices for "small" deviations from LOP allows prices to differ by up to 7-10 percent. Deviations below this level can be very persistent and last up to a decade. Even after accounting for costs of exchanging currency, there are periods with arbitrage opportunities. However, if exchange rates bring prices further out of line then the outlets adjust nominal prices to reduce the deviations from LOP.