From The Representative Agent in Macroeconomics, Hartley, p190-191:
In a remarkable series of papers, Sonnenschein (1972, 1973, 1973), Mantel (1974, 1976), Debreu (1974), and Mas-Colell (1977) showed that in an economy in which every individual well-behaved excess demand function, there are only three restrictions on the aggregate excess demand
(
Read more... )