| 来源类型 | Discussion paper |
| 规范类型 | 论文 |
| 来源ID | DP6902 |
| DP6902 International Portfolios, Capital Accumulation and Foreign Assets Dynamics | |
| Robert Kollmann; Philippe Martin; Nicolas Coeurdacier | |
| 发表日期 | 2008-07-11 |
| 出版年 | 2008 |
| 语种 | 英语 |
| 摘要 | We investigate incidence and evolution of patent thickets. Our empirical analysis is based on a theoretical model of patenting in complex and discrete technologies. The model captures how competition for patent portfolios and complementarity of patents affect patenting incentives. We show that lower technological opportunities increase patenting incentives in complex technologies while they decrease incentives in discrete technologies. Also, more competitors increase patenting incentives in complex technologies and reduce them in discrete technologies. To test these predictions a new measure of the density of patent thickets is introduced. European patent citations are used to construct measures of fragmentation and technological opportunity. Our empirical analysis is based on a panel capturing patenting behavior of 2074 firms in 30 technology areas over 15 years. GMM estimation results confirm the predictions of our theoretical model. The results show that patent thickets exist in 9 out of 30 technology areas. We find that decreased technological opportunities are a surprisingly strong driver of patent thicket growth. |
| 主题 | Industrial Organization |
| 关键词 | Complexity Patent portfolios Patent thickets Patenting Technological opportunities |
| URL | https://cepr.org/publications/dp6902 |
| 来源智库 | Centre for Economic Policy Research (United Kingdom) |
| 资源类型 | 智库出版物 |
| 条目标识符 | http://119.78.100.153/handle/2XGU8XDN/535738 |
| 推荐引用方式 GB/T 7714 | Robert Kollmann,Philippe Martin,Nicolas Coeurdacier. DP6902 International Portfolios, Capital Accumulation and Foreign Assets Dynamics. 2008. |
| 条目包含的文件 | 条目无相关文件。 | |||||
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