Jaime Orrillo Catholic University of Brasilia   Brasilia, Federal District 70790-160 Brazil   orrillo@pos.ucb.br   http://www.cee.ucb.br/mestrado/professores/jaimejoc/jjoc.htm   Biographical Sketch: Jaime Orrillo received his B.A. in Mathematics from ''Universidad Nacional Pedro Ruiz Gallo de Lambayeque, Perú'' in 1990, his M.A. in Mathematics under Ramón García Combián from ''Pontificia Universidad Católica del Peru'', and Ph.D. in Mathematical Economics under Aloisio Araujo and Mario Pascoa from ''Instituto de Matemática Pura e Aplicada, Rio de Janeiro, Brazil'' in 1999. Currently, he works at ''Univesidade Católica de Brasilia, DF, Brasil since March 1999.   Primary Research Focus: Mathematical Economics, General Equilibrium Models with Incomplete Markets, and Economic Theory.   JEL Areas: D5 : General Equilibrium and Disequilibrium: General E6 : Macroeconomic Policy, Macroeconomic Aspects of Public Finance, and General