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Non-technical SummaryInnovation is widely considered to be a key long-term driving force for economic growth. In 1993, the Community Innovation Surveys (CIS) were initiated in the European countries to investigate firms' innovation activities. However, there is still very little empirical evidence on the dynamics in firms' innovation behaviour. Looking at innovation indicators at the aggregate or industry level, we can identify a high and quite stable share of innovators in Germany over the last ten years. One interesting question, however, cannot be answered by such macroeconomic numbers: Is it the same group of firms that always set themselves at the cutting edge by introducing new products and processes or is there a steady entry into and exit from innovation activities at the firm level, with the aggregate level remaining more or less stable over time?This paper analyses the dynamics in firms' innovation behaviour. In particular, it focuses on the following two questions: First of all, is innovation persistent at the firm-level? And secondly, if persistence is prevalent, what drives this phenomenon? In principle, there are various potential sources for persistent behaviour: First, it might be caused by true state dependence. This means that a causal effect exists in the sense that the decision to innovate in one period itself enhances the probability of innovating in the subsequent period. The theoretical literature delivers several potential explanations for state dependent behaviour: success breeds success, dynamic increasing returns (learning effects) or sunk costs in R&D investments. On the other hand, firms may possess certain characteristics which make them more likely to innovate. To the extent that these characteristics themselves show persistence over time, they will induce persistence in innovation behaviour. Such firm-specific attributes can be classified into observable characteristics, like firm size, competitive environment, skills or financial resources, and unobservable ones. For instance, technological opportunities, managerial abilities or risk attitudes are important for the firms' decision to innovate, but are typically not observed (unobserved heterogeneity).The answers to both questions are important from a theoretical as well as a policy point of view. From a theoretical point of view they are interesting because endogenous growth models differ in their underlying assumptions about the innovation...