So far we’ve been looking at frames and rational decision-making purely at the individual level. Agamemnon and Macbeth were grappling on their own account with issues of life and death. Our imaginary agent struggling with temptation was trying to control herself. Other people are involved, of course. Without Iphigenia, Duncan, and Lady Macbeth, Agamemnon and Macbeth would have been tackling very different problems, probably ones that we would not be talking about today. And although actually struggling with temptation can be a very private matter, there are often plenty of other people around ready to pass judgment and offer helpful (or unhelpful) advice. But still, all the decision-making we have been considering has been individual. We have not looked at any examples where multiple agents are making decisions simultaneously, with how things turn out for each agent depending not just on what they decide to do, but also on what other agents decide to do.