Z:gnu-www-ja-frank--2ad7a3-Thus, for students in general/en

Thus, for students in general there is a pronounced tendency toward more cooperative behavior with movement toward graduation, a trend that is conspicuously absent for economics majors. On the basis of the available evidence, we are in no position to say whether the trend for noneconomists reflects something about the content of noneconomics courses. But regardless of the causes of this trend, the fact that it is not present for economists is consistent with the hypothesis that training in economics plays at least some causal role in the lower observed cooperation rates of economists.