“…These observations have been excluded, leaving 10945 observations for our working sample. 11 The nature, incidence, and intensity of COLA clauses and their implications, particularly for modelling wage adjustment, are analyzed in, inter alia, Card (1983Card ( ,1986), Christofides (1987Christofides ( ,1990), Cousineau, Lacroix and Bilodeau (1983), Ehrenbrerg, Danziger and San (1984), Hendricks and Kahn (1985), Kaufman and Woglom (1984), Mitchell (1980), and Vroman (1984). 12 Because of the smaller number of contracts, the first two and the last three years in the sample are considered together in everything that follows.…”