“…These contributions have taken a variety of approaches. Thus, at an academic level, Grech (2015a) presents a classification of studies according to several criteria and distinguishes between cross country studies (Atkinson, Bourguignon, O'Donoghue, Sutherland, & Utili, 2002;Dekkers et al, 2009;Dusek & Kopecsni, 2008;Ferraresi & Monticone, 2009;Fultz, 2006;Holzmann & Guven, 2009;Martin & Whitehouse, 2008;Sefton, Evandrou, Falkingham, & Vlachantoni, 2011;Soede, Vrooman, Ferraresi, & Segre, 2004;Zaidi et al, 2006); country-specific studies (Bottazzi, Jappelli, & Padula, 2006;Bridgen & Meyer, 2008;Flood, Klevmarken, & Mitrut, 2008;Fonseca & Sopraseuth, 2005;Frommert & Heien, 2006;Fultz & Steinhilber, 2003;Goodman et al, 2007;Orban & Palotai, 2005;Van de Coevering et al, 2006) and simulation studies (Falkingham & Johnson, 1995;Kotlikoff, Marx, & Rizza, 2006).…”