For example, American Eagle offers Foursquare users a 15 percent-off coupon when they check-in to stores nationwide.
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So Shake Shack could send a Tweet back to someone who had just snapped a photo of a burger with a link to a 10 percent off coupon on the next visit.
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Not your basic here's your 10%-off-coupon or your free-DVD kind of winner.
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At the same time, GPS-oriented Foursquare fires him off a discount coupon for the restaurant.
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Visa is using payment information to identify shoppers in a particular mall by their payments on the card and them pushing them a coupon worth 20 percent off at the Gap store in that mall.
The reason is that someone buying a high-coupon bond at a premium is entitled to write off the premium over time as a deduction against the interest income.
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