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Chiappori & Ekeland 1999, p. 1437, "...we establish that when the number of agents is at least equal to the number of goods, then any smooth enough function satisfying Walras's Law can be locally seen as the aggregate market demand of some economy, even when the distribution of income is imposed a priori." Chiappori, Pierre-André; Ekeland, Ivar (1999). "Aggregation and Market Demand: An Exterior Differential Calculus Viewpoint". Econometrica. 67 (6): 1435–1457. doi:10.1111/1468-0262.00085. JSTOR2999567.
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