The article describes interpersonal Prisoner's Dilemmas, where if every person optimizes for themselves, the final result will be worse for each and every perso

The article describes interpersonal Prisoner's Dilemmas, where if every person optimizes for themselves, the final result will be worse for each and every person (than if they had all shown restraint). As the article points out, this may explain pollution and overfishing. There are also intertemporal Prisoner's Dilemmas, where each if person-at-time-T optimizes for their immediate goals, the final result will be worse for each and every moment in that person's life. This may explain why we overeat: any given moment is made better with a Big Mac, but if you ate a Big Mac all the time every moment your life would be made much worse than if you led a restrained, healthy life.