Liston-Heyes, Catherine; Pilkington, Alan - In: Science and Public Policy 31 (2004) 1, pp. 15-25
Patterns of ‘inventive concentration’ in green technologies are measured and analysed using patent data on fuel cells — potentially one of the most important ‘green’ technologies. Six measures are described and tested: the coefficient of variation; the Herfindhal index; the 4-firm and...