First Author:   Domenico Buccella Department of Economics, Kozminski University buccella@kozminski.edu.pl   ul. Jagiellońska 57/59 Warsaw, 03-301, Poland   + 48 22 51 92 153(Phone) + 48 22 51 92 153(Fax) Second Author: Luciano Fanti Department of Economics and Management, University of Pisa lfanti@ec.unipi.it   Via Cosimo Ridolfi, 10, I Pisa, 56124, Italy   +39 050 22 16 369(Phone) +39 050 22 16 384(Fax)