  Escalation is the fact that in a game (for instance an auction), the agents
play forever. It is not necessary to consider complex examples to establish its
rationality. In particular, the $0,1$-game is an extremely simple infinite game
in which escalation arises naturally and rationally. In some sense, it can be
considered as the paradigm of escalation. Through an example of economic games,
we show the benefit economics can take of coinduction.
