With 44% of shoppers owning smartphones, per Nielsen, some brick-and-mortar retailers are resisting applications that allow shoppers to easily compare prices and buy products elsewhere. Amazon took it up a notch, offering coupons as an inducement to check prices, forcing Best Buy to price-match Amazon on many items through its own online portals. Other stores, such as Brookstone, are designating items as exclusively branded to the store so the apps can't directly compare them.

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