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This paper attempts to determine the extent to which the concept of «intra-organizational bargaining», suggested by Walton and McKersie, among others, is useful in analyzing wage differentials between sub-groups within a local union. Based on historical data for public schoolteachers in Saskatchewan, the results show that the relative power of sub-groups within the union has a much stronger bearing on internal wage differentials than do the economic variables. This lends strong support to the intraorganizational bargaining model of internal wage differentials.