Cappelli, Riccardo; Czarnitzki, Dirk; Kraft, Kornelius - In: Research Policy 43 (2014) 1, pp. 115-120
We estimate the effect of R&D spillovers on sales realized by products new to the firm (imitation) and new to the market (innovation). It turns out that spillovers from rivals lead to more imitation, while input from customers and research institutions enhance original innovation.