Guido Ascari University of Pavia   Via S. Felice 5 Pavia, 27100 Italy   guido.ascari@unipv.it   http://economia.unipv.it/pagp/pagine_personali/gascari/ascari.htm#an1           JEL Areas: E6 : Macroeconomic Policy, Macroeconomic Aspects of Public Finance, and General