 Consider again the new coordination game of  Figure 1:  for players to obey the norm, and thus choose C, it must be the case that each expects the other to follow it. In the original prisoner’s dilemma, empirical beliefs would not be sufficient to induce cooperative behavior. When a norm exists, however, players also believe that others believe they should obey the norm, and may even punish them if they do not. The combined force of empirical and normative expectations makes norm conformity a compelling choice, be it because punishment may follow or just because one recognizes the legitimacy of others’ expectations (Sugden 2000).