“…As observed by Olsen (2006) and Schwörer (2013) direct investigations of the impact of outsourcing on firm performance are relatively small and provide some evidence that outsourcing can increase productivity, but the identified effects are quite heterogeneous depending on the analysed country, the firm's specific characteristics (exporters versus non-exporters, foreign-owned versus domestic) or the kind of activities outsourced (materials or services). Several studies (Girma & Görg, 2004;Hanley, 2004 and2011;Egger & Egger, 2006;Jabbour, 2010;Wagner, 2011;Schwörer, 2013) find some positive connection between productivity and outsourcing, though often this is limited to specific kind of firms or to the outsourcing of services, and to international outsourcing. However, other authors report no significant connection between outsourcing and a firm's performance (Gilley & Rasheed, 2000;Laugen et al, 2005) or any negative effect.…”