A competitive spirit has its place in the office. It can be a positive force that pushes you to do your best work, thereby strengthening your company and increasing your job security and potential rewards.
Some people, however, become possessed with the competitive spirit. They begin to view work as a zero-sum game and coworkers as obstacles to their advancement. At this point, when a coworker is willing to step on your head to reach his goals, competition becomes negative.