ISSN 1791-3144 University of Macedonia Department of Economics Discussion Paper Series What explains output volatility? Evidence from G3 Maria Grydaki and Stilianos Fountas Discussion Paper No. 09/2010 Department of Economics, University of Macedonia, 156 Egnatia str, 540 06 Thessaloniki, Greece, Fax: + 30 (0) 2310 891292 http://econlab.uom.gr/econdep/