This study investigated the extent to which sex composition and average team academic achievement of student simulation teams affect team effectiveness. Seventy-four students in two sections of a marketing principles class were divided into 20 teams to test their decision-making skills. For 10 weeks, each team operated a simulated supermarket using the Quaker Oats version of the Purdue Supermarket Game. Four teams were all female, six were all male, and ten teams were mixed. The measure of team effectiveness was the degree of profitability achieved by each team at the end of the 10-week period. In terms of the degree of profitability averages, the 4 all-female teams performed best, followed by the 6 all-male teams, with the 10 mixed teams doing the least well. The average team academic achievement appears to be unrelated to team performance. Results indicate that while there are some significant differences, additional research in this aspect of student simulation participation is still needed. (Author/LMM)