“…9 In the literature, the choice to consider annual data to estimate growth equations à la Solow is followed, among the others, by Benos and Karagiannis (2008), Lanzafame (2005), Lee et al (1998), Loddo (2006) and Presbitero (2005). The use of annual data is also linked to the impossibility to divide the years from 1996 to 2007 in sub-periods, as was effected, for the case of the Italian regions by Carmeci and Mauro (2002), Di Liberto et al, (2007) and Aiello and Scoppa (2006). In fact, also considering three year intervals, only four observations would be obtained for each region (1996-98; 1999-01; 2002-04, 2005-07).…”