Other recent studies have attempted to analyse how productivity and wage spillovers may occur by looking at specific ways domestic firms engage with foreign firms. For example, Görg and Strobl (2005) examine empirically the contribution of worker mobility to productivity spillovers using a panel of Ghanaian manufacturing firms. They find that domestic firms with an owner who has previously been employed in a foreign firm in the same industry, are more productive than other domestic firms. Balsvik (2006) analyses productivity spillovers through worker mobility using linked employer-employee data for Norway. She finds that workers with prior experience in MNEs tend to contribute 20-25% more to productivity than workers without such experience. Moreover, the contribution to firm productivity exceeds the private return to mobility, which suggests that worker mobility entails genuine productivity externalities. Poole (2006) analyses the role of worker mobility for wage spillovers using linked employer-employee data for Brazil.16 She finds evidence in support of positive wage spillovers and that their magnitude depends on the skill levels of workers previously employed by MNEs and incumbent workers in the domestic firm.