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A large-scale field experiment shows how to customize mobile discount offers for maximum effect. A promotion for a nearby event should be offered very close in time to when the event will occur. When mobile users are farther away, a one-day delay gets better results.

New research finds that the longer a CEO is in office, the stronger the company-employee relationship becomes--but after a time, the company-customer relationship weakens because of changes in how CEOs learn over the course of their tenure.