Changes in the parameters of an n-dimensional system of equations induce changes in its solutions. For a class of such systems, we determine the qualitative change in solutions given certain qualitative changes in parameters. Our methods and results are elementary yet useful. They highlight the existence of a common thread, our "own effect" assumption, in formally diverse areas of economics. We discuss several applications; among them we establish the existence of efficient equilibria in English auctions with interdependent valuations, and a version of the Stopler-Samuelson Theorem for an n X n trade model.
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Paper provided by California Institute of Technology, Division of the Humanities and Social Sciences in its series Working Papers with number
1178.
Length: 15 pages Date of creation: Sep 2003 Date of revision: Publication status: Published: Handle: RePEc:clt:sswopa:1178
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