The power of buyers in the market:
Last year, he might have just dropped the $184.85 Garmin global positioning system into his cart. This time, he took out his Android phone and typed the model number into an app that instantly compared the Best Buy price to those of other retailers. He found that he could get the same item on Amazon.com Inc.’s website for only $106.75, no shipping, no tax.
Mr. Tang bought the Garmin from Amazon right on the spot….
Private companies, creating software for devices from other private companies, that gives private buyers to assess quickly the best price on private goods.
Via Phone-Wielding Shoppers Strike Fear Into Retailers – WSJ.com