1. a Department of Economics, Dept.de Estatistica , Southern Illinois University, Universidade Federal de Pernambuco Cidade Universitéria , Carbondale,Recife/PE , IL , 62901-4515, 50740-540 , USA, Brazil
2. b Department of Economics , Foundation for Economic and Industrial Research, University of Athens , 11 Karatasi st, 8 Pesmazoglou str, Athens, Athens , GR , 11742 , Greece, Greece