It becomes impossible to measure who contributed what to the overall performance of the group.2 In a 4 × 100 meter relay race, for example, the victorious team is not always the one that has the fastest sprinters. The runners also have to skillfully pass the baton. To do so, they must divert energy to their arms to properly make the pass and to their voices to effectively communicate—rather than putting all their energy into their legs for maximum speed. Consider the 2003 World Athletics Championships. Of the eight teams competing in the women’s 4 × 100 meter relay final, the United States was heavily favored yet the French team won. Based on the individual records of its runners, the US team should have been the fastest by far. The sum of the 100-meter personal best performances of the four US runners, compared to that of the French runners, gave the US team an edge of as much as 3.2 meters. And, considering 2003 performances only, the US margin over their French rivals was 6.4 meters. According to Christine Arron, who ran the final leg for the French, the win was achieved through exceptional cooperation.3 In this kind of activity, there is no way to precisely measure individual performance.