“…Different empirical studies, by considering diverse country samples and/or periods and using various econometric techniques and models, reached different conclusions regarding the specific impact of some or all of the above institutional variables (eg, OECD, 1994;Scarpetta, 1996;Nickell, 1997;Signorelli, 1997;Garcilazo and Spiezia, 2007;Bassanini and Duval, 2009;Feldmann, 2009;Arpaia and Curci, 2010). Others combined institutions and sub-national level variables to explain regional (un)employment rate differences and dynamics (eg, Signorelli, 2007 andMarelli et al, 2012a;Demidova and Signorelli, 2012). The lagged level of unemployment is often added to control for a persistence effect.…”