Z:gnu-www-ja-frank--43e1c8-Focusing on subjects in the un/en

Focusing on subjects in the unlimited subsample, we see in Figure 7 that the difference between economics majors and nonmajors virtually disappears once subjects are permitted to make promises to cooperate. For this subsample, the defection rate for economics majors is 28.6 percent, for nonmajors 25.9 percent.