Haoning Sun;Feng Dong;Guang Yang;

• 1:School of Economics and Management
• 2:Tsinghua University
• 3:School of Economics
• 4:Nankai University

Abstract：

Based on Matsuyama(1999), we construct an endogenous growth model that includes innovation decisions, and discuss the impact of policies such as patent protection on corporate innovation incentives and innovation-driven development. We find that the impact of the intensity of patent protection policies on economic dynamics is nonlinear: when the patent protection policy is too weak, potential innovative firms have no incentive to innovate, and the economy cannot achieve the innovation-driven growth path; when the patent protection policy is too strong, the innovation speed and capital accumulation speed are difficult to match, resulting in an endogenous cycle between the factor-accumulation-driven interval and the innovation-driven interval. At the same time, we introduce population growth into the model and discuss the impact of declining population growth on the realization of innovation-driven growth. We find that under certain conditions, the decline in population growth will lead to an increase in innovation costs and a decrease in innovation speed, while the government can offset this effect by reasonably strengthening patent protection and subsidizing innovation.

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Foundation: 国家青年科学基金项目（B类）;; 原创探索项目（项目编号：72122011,72250064）;; 清华大学自主科研计划（项目编号：2023THZWJC03）的资助

Authors: Haoning Sun;Feng Dong;Guang Yang;

References：

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• (1)事实上,专利保护涉及专利时间长度(length)和专利保护强度(breadth),本文主要讨论专利保护强度,即在专利期间厂商所具有的垄断势力,因而将专利时间长度标准化为1期。 (2)篇幅所限,文中未展示理论结果的证明,如有需要,请联系作者获取。 (3)注意当■时经济系统回到Matsuyama(1999)研究中的系统,Gardini et al.(2008)对该系统的稳态和循环性质给出了完整的证明。