Starting on Saturday, Amazon (AMZN) is launching a promotion in which consumers will receive up...


Starting on Saturday, Amazon (AMZN) is launching a promotion in which consumers will receive up to a $5 discount on Amazon merchandise if they compare prices at a store using its Price Check app, available for iOS and Android. As Tricia Duryee observes, the promotion is not only useful for boosting sales, but for letting Amazon's customers provide it with mountains of price data about competing retailers.

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