In addition, to the extent that social protection becomes enshrined as a social
‘‘right,’’ political mobilization aimed at expanding or maintaining social policies
gains in legitimacy (Esping-Andersen and Korpi 1984; Klass 1985). Unemployment
insurance administered through unions—the ‘‘Ghent’’ system—was used as a selective
incentive to attract members, and thus led to higher rates of union membership
in countries that organized unemployment policy in this way (Rothstein 1992)