“…However, if the theoretical background underlying self‐selection mechanisms (Costantini & Melitz, 2009; Melitz, 2003) has been strengthened by the empirical literature (Aw et al, 2000, 2011; Helpman et al, 2004), within which it has been widely documented that firms introducing product or process innovations are ex‐post more likely to export (see, among others, Altomonte et al, 2013; Basile, 2001; Becker & Egger, 2013; Cassiman et al, 2010; Cassiman & Golovko, 2011; Lachenmaier & Wößmann, 2006), the ‘learning’ hypothesis has gained less empirical evidence in spite of a solid theoretical background in equilibrium frameworks (Grossman & Helpman, 1991; Howitt & Aghion, 1998). Besides, within this body of empirical literature the focus has been only on the firms’ export activities, studying their impact on product innovation (Fafchamps et al, 2008; Salomon & Shaver, 2005), process innovation (Damijan et al, 2010), both types of innovation (Bratti & Felice, 2012; Bustos, 2011; Lileeva & Trefler, 2010) or patent activities (Accetturo et al, 2014).…”