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"Stack ranking" made Microsoft employees want to compete with one another instead of other companies    

From DailyTech:
In an effort to move toward a more collaborative culture within Microsoft's walls, the software giant is axing its longtime system of "stack ranking."

Microsoft's stack ranking system was a management technique where each unit has a certain percentage of employees that are identified as top workers, good workers, average workers and poor workers. In other words, if there is a unit of 10 employees, it's understood that two people would be designated the top workers while seven employees would receive good or average reviews and the last one would get a poor review.
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