1. Reputation, incentives, and opportunism (with Christian Hilbe)

2. Public Good game with positive or negative incentives Two players game for simplicity and to compare with Rand, Armao, Nakamaru and Ohtsuki (2010)

3. Public goods with punishment

4. 2-Stage Game

5. 2 Stage Game

6. Conditional Strategies

7. Punishment unstable

8. Opportunistic Players

10. Bistability [O C,P]

11. Role of reputation in Punishment Punishment as deterrent

12. Role of reputation in Punishment Punishment as deterrent Revenge economically useful

13. Role of reputation in Punishment Punishment as deterrent Revenge economically useful Revenge is sweet (=fitness-enhancing) Anger is loud

14. Role of reputation in Punishment Punishment as deterrent Revenge economically useful Revenge is sweet (=fitness-enhancing) Anger is loud Barclay (‚Don‘t mess with the enforcer‘)

15. Role of reputation in Punishment Punishment as deterrent Revenge economically useful Revenge is sweet (=fitness-enhancing) Anger is loud Barclay (‚Don‘t mess with the enforcer‘) Non-altruistic punishment

16. Role of reputation in Punishment Punishment as deterrent Revenge economically useful Revenge is sweet (=fitness-enhancing) Anger is loud Barclay (‚Don‘t mess with the enforcer‘) Non-altruistic punishment Kurzban et al, Suter: ‚Audience effects‘

19. The feeling of being watched ‚Conscience…the nagging feeling that someone may be watching‘ (Mencken)

20. The feeling of being watched Subliminal cues: Fessler, Haley Bateson et al Ancestral environment

21. Public goods with reward

22. Trust game

23. Trust game with reputation

24. Trust game with reputation For large mu, prosocial behavior

25. Reward and Punishment

26. Payoff

27. Results:

28. The case of high information (μ=0.75)

29. The case of low information (μ=0.25)

32. Antisocial Punishment

33. Antisocial punishment Rand, Armao, Nakamaru, Ohtsuki (JTB 2010) Localised interaction: Social life in groups of N+1 individuals (introduces spite effects) Modified replicator equation (or z-dynamics)

34. Antisocial Punishment