Somdeb Lahiri SPM, PDPU   ,   somdeb.lahiri@yahoo.co.in     Biographical Sketch: Born:May 1,1957. Educational Qualification :Ph.D (Economics),University of Minnesota (Twin Cities),USA. Present Designation:Professor Institute of Petroleum Management, Gandhinagar (PD Petroleum University).   Primary Research Focus: Social Choice Theory   JEL Areas: D7 : Analysis of Collective Decision-Making: General D6 : Welfare Economics: General