Considering the characteristics of technical innovation and the existence of overconfidence in complex project team, we construct a cooperative behavior model of construction project team based on overconfidence and analyze the mechanisms that how overconfidence affects team members' cooperative effort and innovating performance. We explore and compare the optimal effort under rational condition, condition in which all the team members are overconfidence and condition in which part of team member is overconfidence, respectively. The results show overconfidence may enhance team member' optimal effort and improve performance of technical innovation in last two conditions, which provide some reference for complex project practice.
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