This paper provides an empirical analysis of the mechanism through which R&D and export influence investment decision. The analysis is based on a large representative and cross-country comparative sample of manufacturing firms across seven European countries. To control for reverse causality between export decision and R&D spending and investment, we use an instrumental variable analysis to overcome the problem of endogeneity. Employing a three step procedure, it is assumed that R&D decision is endogenously determined by receiving public subsidies, and, in turn, affect investments through its impact on engagement by the firm in international trade. The results suggest that R&D positively affects export propensity. We find that there is an average increase in propensity to invest for those firms which decide to engage in R&D activities. The results also reveal that the effect of decision to export on investment behaviour is positive and highly significant, when accounting for endogeneity of export activity.