“…See also Booth (1985) and Naylor (1989) who, building on the framework of Akerlof (1980), use social customs models to address the issue of endogenous union membership. 3 The view that there is a link between union membership and employment has been pointed out by, for example, Booth (1983), Barker et al (1984), and Kidd and Oswald (1987). In Sweden during the recession years 1992-95, membership in the central blue-collar union (LO) fell by 48,000 members (Statistical Yearbook of Sweden, 1994-1997.…”