Greg Webb’s eight-year-old son doesn’t understand why nothing happens when he repeatedly taps and pinches his dad’s desktop PC screen. Webb, the president of Sabre Travel Network, believes his son’s impatience with a device that doesn’t react to his fingertips is a metaphor for the profound effect that the multi-channel, multi-device phenomenon is having on the way people shop and buy. And it is one of several developments that is forcing  experts at ...

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