 Take for example conventions such as putting the fork to the left of the plate, adopting a dress code, or using a particular sign language. In all these cases, my choice to follow a certain rule is conditional upon expecting most other people to follow it. Once my expectation is met, I have every reason to adopt the rule in question. In fact, if I do not use the sign language everybody else uses, I will not be able to communicate. It is in my immediate interest to follow the convention, since my main goal is to coordinate with other people. In the case of conventions, there is a continuity between the individual’s self-interest and the interests of the community that supports the convention. This is the reason why David Lewis models conventions as equilibria of coordination games. Such games have multiple equilibria, but once one of them has been established, players will have every incentive to keep playing it (as any deviation will be costly).