Z:gnu-www-ja-frank--b0b294-Because the higher defection r/en

Because the higher defection rates for economics majors are largely attributable to the no-promises conditions of the experiment, the remainder of our analysis focuses on subjects in the limited and intermediate groups. The conditions encountered by these groups are of special significance because they come closest to approximating the conditions that characterize social dilemmas encountered in practice. After all, people rarely have an opportunity to look one another in the eye and promise not to litter on deserted beaches or disconnect the smog control devices on their cars.