Managers who deliberately leave certain workers out of the loop, whether for strategic, political or pragmatic reasons, could be causing themselves major headaches down the line, writes Heidi Grant Halvorson, a motivational psychologist. Sidelined employees don't just get annoyed, they start questioning the foundations of their workplace relationships, Halvorson writes. "The short-term gains could be far outweighed by the significant losses of trust, cooperation, loyalty and motivation you create," she warns.

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