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Providing shoppers with a chance to buy and transport goods across international boundaries without paying local and national taxes, duty-free shops are found in airports and other ports and stations around the world. A creation of the 20th century, duty-free shops mark a sharp departure from more than 2,000 years of nations generating revenue by taxing the trade in commodities and other goods.
Want the text version?: http://www.todayifoundout.com/index.php/2015/02/origin-duty-free/