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Greenberg's Language Universals is typical of his typological-theoretical work in its stunning originality. Starting out from the observations underlying Praguian markedness, Greenberg contributes a mass of new data and generalizations and lays the foundations for a post-structuralist, usage-based theory of grammatical asymmetries. This work will continue to be influential for many years to come.
Joseph Greenberg (Wed,) studied this question.