The egocentric bias is the tendency to overestimate your contribution to a group effort. While there is a motivational component to this, there is a cognitive component due to the availability heuristic. Our contributions to a group effort are psychologically available. We can easily think of examples of what we contributed because we did it, thus overestimating the contribution. We have a difficult time thinking of examples of what others contributed because we were doing other things, thus underestimating their contribution.
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