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D. M. Shapiro, M. Stelcner, The Persistence of the Male-Female Earnings Gap in Canada, 1970-1980: The Impact of Equal Pay Laws and Language Policies, Canadian Public Policy / Analyse de Politiques, Vol. 13, No. 4 (Dec., 1987), pp. 462-476
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Shapiro et al. (1987) studied this question.
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