We extend an earlier model of innovation dynamics based on invasive percolation by adding endogenous R&D search by economically motivated firms. The {0,1} seeding of the technol-ogy lattice is now replaced by draws from a lognormal distribution for technology ‘difficulty’. Firms are rewarded...

This paper focuses on the analysis of size distributions of innovations, which are known to be highly skewed. We use patent citations as one indicator of innovation significance, constructing two large datasets from the European and US Patent Offices at a high level of aggregation, and the...

Abstract not available

While long waves have been seriously discussed by economists for almost one hundred years, to date there is no scientific consensus that particular frequency components are in any way privileged in the undoubtedly fluctuating history of modern economic and political development. This is...

The theory of long waves is exceptionally fortunate in that, while there is no general consensus that they exist or, assuming that they do, what an appropriate theory should be, due to the unstinting efforts of several researchers, we have encyclopaedic compendia of the literature (Freeman 1996,...

This study analyses the medium-term effect of RD expenditure on firm employment growth. Four cross-sectional waves of an innovation survey conducted in the Netherlands have been used to evaluate the effect on firm growth in the five years following the investment. Panel data fixed effect...

The European economy is currently in a slump, the worst since the 1930s. Although this is often seen as a consequence of the financial crisis that hit the capitalist world in 2007-8, we argue that many of the problems that Europe faces today have long-term roots to do with the fact that Europe...

This paper will present a multi-region-multi-country model in which inter-regional knowledgespillovers determine the growth of regions. Key parameters in the model are the learningcapability of a region, and the exogenous rate of knowledge generation (R&D). The intensityof spillovers depends on...

This paper analyses the effect of locally bounded knowledge spillovers on regionaldifferences in growth. A model will be developed that allows spillovers to take place acrossregions. Certain conditions determine the amount of spillovers a region receives. By use ofsimulations (with randomised...

The research area of the economics of innovation and technological change (EITC) has flourished over the past decades. While it was a relatively marginal field of economics in the 1950s and 1960s, the field has now grown to become a major part of economic analysis. Because many of the early...