研究者情報 | 神奈川大学

シナガワ　シュンスケ Shinagawa Shunsuke 品川　俊介所属神奈川大学経済学部経済学科/現代ビジネス学科神奈川大学大学院経済学研究科経済学専攻（公共政策コース）職種准教授
言語種別	英語
発行・発表の年月	2026/04
形態種別	その他論文
標題	Patent Length and Economic Stability
執筆形態	共著
掲載区分	国外
担当区分	筆頭著者,責任著者
著者・共著者	Eiji Tsuzuki
概要	This study examines the impact of patent length on macroeconomic stability in the variety-expansion framework with finitely lived patents established by Judd [Econometrica 53 (1985), 567-585]. By analyzing the system of functional differential equations derived from this canonical model, we derive the necessary and sufficient condition for the local stability of the steady state. This condition reveals that patent length affects macroeconomic stability and triggers a transition between damped and divergent oscillations. Furthermore, we demonstrate that the relationship between patent length and stability can be either monotonic or non-monotonic. In the non-monotonic case, stability lost as a result of shortening of the patent length can be restored by additional shortening. While much of the existing literature on patent policy focuses on economic growth and welfare, our results highlight the importance of accounting for the implications of patent policy for dynamic stability.
DOI	https://dx.doi.org/10.2139/ssrn.6573658