“…This easily observable phenomenon is usually absent from the standard models of trade unions. Although a lot of empirical studies have been done for developed countries (see Booth, 1995, Kennan, 1985, Card, 1990, and references therein), analyzing the duration of strikes, very little work has been done in the theoretical literature aiming at explaining the occurrence of strikes. While the seminal paper on this topic (Ashenfelter and Johnson, 1969), and a small number of followers in the same vein (Farber, 1978, Kennan, 1986, were in fact assuming that a strike was going on, for analyzing its duration as a function of the concessions made by the firm, the most recent literature has taken a game-theoretic approach (e.g.…”