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In page Graciela Chichilnisky:

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In welfare economics and voting theory, particularly in the specialty of social choice theory, Chichilnisky introduced a continuous model of collective decisions to which she applied algebraic topology; following her initiatives, continuous social choice has developed as an international subdiscipline. During the 1980s and 1990s some of Chichilnisky's research was done in collaboration with mathematical economist Geoffrey M. Heal, who has been her colleague at Essex and Columbia.[citation needed]