The purpose of this study is to evaluate management effi ciency of professional teams in the Korean Baseball Organization by using Data Envelope Analysis (DEA). The professional baseball teams in Korea are in urgent need of effi cient management as no teams are making profi ts and their fi nancial defi cits are growing. DEA is a technique to measure relative effi ciency when coping with multiple inputs and multiple outputs. We implemented total player salary as input item and winning percent and total fan attendance as output item to evaluate 8 teams' management effi ciency for the 2004 season. The analysis identifi ed teams operating relatively effi cient and teams that are not effi cient. The result revealed that a team's effi ciency score is not necessarily correlated to the fi nal standings in the league. Rather, teams relatively mediocre sized outperformed the teams well-known for its fi nancial abundance.
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