Z:gnu-www-ja-frank--566196-The coefficients for the unlim/en

The coefficients for the unlimited and intermediate experimental categories represent effects relative to the defection rate for the limited category. As expected, the defection rate is smaller in the intermediate category (where subjects have more time to interact than in the limited category), and falls sharply further in the unlimited category (where subjects are permitted to make promises to cooperate). With subjects' permission, we tape recorded the conversations of several of the unlimited groups, and invariably each person promised each of his partners he would cooperate. (There would be little point, after all, in promising to defect.)