BUENOS AIRES - Imagine the scenario: You have just spent the day shopping, and shiny plastic bags are littered at your feet as you chew the last forkful of the most succulent rib-eye steak you have ever tasted. The sommelier pours the last bit of a fruity Malbec into your glass, and you glance around, soaking up the minimalist room's bits of European-design eye candy. You order coffee and a caramel-filled crepe before confronting the check. And then you smile. Because, just as you have been doing with every receipt all day, you mentally take the total and divide it by three, to account for the phenomenal 3-to-1 exchange rate in Argentina. In the end, you pay the equivalent of $52 for the four-star dinner for two, including three courses, drinks, wine, and tip.