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This paper appeared in the Journal of Mathematical Economics volume 3, 1976. With the permission of the publishers, I have scanned the original. The publishers have asked that I note that the website of the JME is http://www.sciencedirect.com/science/journal/03044068.

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ABSTRACT:
Gale and Mas-Collel and Shafer and Sonnenschein introduced powerful new theorems on the existence of competitive equilibrium which used the assumption that the graph of the strict preference relation P is an open set. We show when this condition is satisfied and when it is not.

SUGGESTED CITATION:
Ted Bergstrom, Robert Parks, and Trout Rader, "Preferences Which Have Open Graphs" (January 21, 1976). Department of Economics, UCSB. Ted Bergstrom. Paper 1976B.
http://repositories.cdlib.org/ucsbecon/bergstrom/1976B