Federico Echenique (Departmento de Economía, Facultad de Ciencias Sociales, Universidad de la República and California Institute of Technology, Pasadena CA 91125, USA.) Alejandro Manelli (Department of Economics, Arizona State University, Tempe, AZ 85287-3806, USA)
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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 Stolper-Samuelson Theorem for an n × n trade model.
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Find related papers by JEL classification: C60 - Mathematical and Quantitative Methods - - Mathematical Methods and Programming - - - General D44 - Microeconomics - - Market Structure and Pricing - - - Auctions F11 - International Economics - - Trade - - - Neoclassical Models of Trade
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