The lingua franca of "cooperatives" and "solidarity economy" is broad and empowering.  As for substantive concepts, processes, movements, and phenomena, "cooperatives" and "solidarity economy" are neither mutually exclusive nor wholly unrelated.  To be sure, no dichotomy exists between them. Both espouse collectivism and cooperation.  Both expose the perils of rugged individualism and competition.  Both foster inclusion, not exclusion. Both encourage dynamic, rather than static, approaches to development.  And both convey the crucial role of institutions and organizations in societies, whether in the social, economic or political sphere.  All these demonstrate that "cooperatives" and "solidarity economy" are germane to the discourse of industrial relations as a multidisciplinary field.