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Tesco is a Korean multinational company, they faced the dilemma of how to increase sales without increasing stores as competition which is e-mart, to whom he can not compete in number of branches.
These Koreans came up with the great idea of bringing the supermarket customer. They opened virtual stores in subway stations in Seoul (capital of Korea). They placed great graphics with products normally sold in stores, each with its QR code so you can scan the product with your cellphone and make a shopping cart online. You are charged to your card and then the store sends you home.