EVANSTON—Katherine Eisner, a Weinberg economics major, was dismayed to hear that she would be once again learning about the famous Prisoner’s Dilemma in her game theory class. “Great,” sighed an exasperated Eisner, “just great. I don’t think it stuck the first 12 times I learned it, but 13th time’s the charm, right?” “The Prisoner’s Dilemma is a fundamental and central example in the field of game theory,” explained Joan Docter, Eisner’s professor, “and it is impossible to proceed without first