Andrey Brevern Senior researcher, Institute of Control Sciences (ICS) of the Russian Academy of Sciences (RAS)   ,   abrevern@mail.ru     Biographical Sketch: 1983 M.S. in Automation and Remote Control, Moscow Institute of Electronic and Mathematics. 1987 PhD. in Applied Mathematics, ICS of the RAS. 1987 - present, Senior stuff researcher, ICS of the RAS.   Primary Research Focus: Social choice theory, preference aggregation rules   JEL Areas: D7 : Analysis of Collective Decision-Making: General E1 : General Aggregative Models: General