Patents in a Model of Endogenous Growth

This paper examines patent protection in an endogenous-growth model. Our aim is twofold. First, we show how the patent policies discussed by the recent patent-design literature can influence R&D in the endogenous-growth framework, where the role of patents has been largely ignored. Second, we explore how the general-equilibrium framework contributes to the results of the patent-design literature. In a general-equilibrium model, both incentives to innovate and monopoly distortions depend on the proportion of industries that conduct R&D. Furthermore, patents affect the allocation of R&D resources across industries, and patents can distort resources away from industries where they are most productive.     

Vintage Human Capital, Demographic Trends, and Endogenous Growth

We study how economic growth is affected by demographics in an OLG model with a realistic survival law. Individuals optimally chose the dates at which they leave school to work and at which they retire. Endogenous growth arises thanks to the accumulation of generation-specific human capital. Favorable shifts in the survival probabilities induce longer schooling and later retirement but have an ambiguous effect on per-capita growth. The long-term relationship between fertility and per-capita growth is hump-shaped. Increases in longevity can be responsible for a switch from a no-growth regime to a sustained growth regime and for a positive relationship between fertility and growth to vanish. Solving numerically the equilibrium, demographic changes can have important medium-term effects even if long-term changes are very small. Journal of Economic Literature Classification Numbers: 041, I20, J10.     

人力资本投资结构与经济增长——基于包含教育资本、健康资本的内生增长模型理论研究

文章针对已有的关于人力资本投资的理论研究往往只关注于人力资本投资数量而忽视人力资本投资结构的现状,把教育和健康看作两种资本,分析了人力资本投资结构的具体构成形式。假设人力资本由教育资本和健康资本按照Cobb-Douglas生产技术形式组合生成,在扩展MRW模型的基础上,文章构建了一个内生经济增长模型。分析结论表明人力资本投资结构制约着经济增长,人力资本投资结构和数量(存量)都对经济产生重要影响。     

人本资本形成与内生经济增长

在生产力与生产关系之间关系上分析了技术进步与制度创新的匹配关系。在知识经济时代资本泛化趋势下,以技术要素、制度要素为核心黏合其他要素形成具有多元产权主体的人力资本、治理资本在经济组织内有机整合为人本资本。以制度要素为核心的治理资本边际收益递减假设、技术要素为核心的人力资本边际收益递增假设、制度创新和技术进步匹配假设的基础上导出人本资本形成与其内生经济增长关系,并分析了我国某些国有企业存在的一些弊端。     

资源约束条件下长期经济增长的动力机制--基于内生增长理论模型的研究

文章通过将存量有限且不可再生的自然资源引入生产函数,构建了一个产品种类扩张型的四部门内生增长模型。首先,通过对模型的市场均衡分析,给出了平衡增长路径的经济增长率以及均衡解存在的一个充分性条件,系统地探讨了在人口增长、自然资源不断耗竭的约束条件下内生技术进步促进长期经济增长的动力机制;其次,通过对平衡增长路径进行比较静态分析,讨论了各经济变量以及经济环境参数的变化对稳态增长率的影响效应及其作用机制,并给出其经济学解释;最后是综合结论及政策涵义。     

Patent Policy in an Endogenous Growth Model

We investigate how the patent policy affects economic growth and social welfare based on an endogenous growth model with R&D activities. We show that the patent length that maximizes the social welfare is finite. Moreover, by introducing compulsory licensing, we also show that the patent length that maximizes the social welfare is not infinite even if the royalty rate can be controlled. Received June 29, 2001; revised version received February 5, 2002 Published online: February 17, 2003 We wish to thank two anonymous referees for their constructive comments. We also thank Akira Yakita for his helpful comments.     

我国人力资本投资对经济增长作用的实证研究

我国作为世界上的大国,拥有世界1/5的人口,但是资源的稀缺约束着我国的发展。不过,我国所具备的充裕人力劳动资源是不可忽视的优势,若能将人力资源转化为人力资本,必定会推动我国经济进一步发展。通过计量经济学分析模式,剖析了我国人力资本投资对经济增长的贡献作用,阐明了人力资本投资对经济增长的促进作用。并就如何加强我国人力资本投资与建设提出了建议。     

Schooling, Training, Growth and Minimum Wages

We examine how the long-run growth performance of an economy is affected by a labor market distortion. In our model, growth occurs through skill formation, and skills are generated through schooling and training of unskilled workers. We analyze how a minimum wage legislation affects long-run growth. In general, the effects are ambiguous. The reason is that while a minimum wage discourages training, it also encourages schooling. The net effect then depends on whether training or schooling dominates the long-run increases in labor productivity.
JEL classification : I 20, J 31, O 40     

A Closed-form Solution of the Uzawa-Lucas Model of Endogenous Growth

This paper presents a closed-form solution to the Uzawa-Lucas endogenous growth model with human and physical capital. Our result also applies if an external effect in the use of human capital in goods production occurs. Using the ``guess-and-verify' method, we determine the two value functions of the social planner in the centralized economy and of the representative agent in the decentralized case. We show that the introduction of income taxes on wages and of a subsidy on physical capital earnings helps the decentralized economy in reaching the social optimum, while keeping the policy maker's budget balanced. Finally, we derive the time-series implications of the model's solution.     

Population and Economic Growth Under Different Growth Engines

Using a growth model with physical capital accumulation, human capital investment and horizontal R&D activity, this paper proposes an alternative channel through which an increase in the population growth rate may yield a non‐uniform (i.e., a positive, negative, or neutral) impact on the long‐run growth rate of per‐capita GDP, as available empirical evidence seems mostly to suggest. The proposed mechanism relies on the nature of the process of economic growth (whether it is fully or semi‐endogenous), and the peculiar engine(s) driving economic growth (human capital investment, R&D activity, or both). The model also explains why in the long term the association between population growth and productivity growth may ultimately be negative when R&D is an engine of economic growth.     

The Microeconomics of an R&D-Based Model of Endogenous Growth

This paper explores the microeconomic structure underlying a class of endogenous growth models in which product differentiation and stochastic quality growth coexist. The general equilibrium model generates a stationary stochastic equilibrium in which a nondegenerate ergodic distribution of firm size depends systematically on parameters of the model. Features of the model necessary for stable endogenous aggregate growth are explored, and predictions of the model are compared with microeconometric evidence on R&D intensity, firm growth, and concentration.     

Anticipated Environmental Policy and Transitional Dynamics in an Endogenous Growth Model

This paper makes a new attempt toinvestigate how an anticipatedenvironmental policy governs the transitionaldynamics of an economy when pollutionexternality is taken into account. Themodeling strategy we use is an AK technologyendogenous growth framework with an endogenousleisure-labor choice. It is found that, unlikeinelastic labor supply framework, a rise inpublic abatement expenditure will stimulate thebalanced economic growth rate. It is alsofound that public abatement technology plays animportant role in determining the transitionaladjustment of the economic growth rate inresponse to a pre-announced environmentalpolicy.     

贸易、环境污染与经济增长——基于开放经济下的一个内生增长模型

通过构建一个开放经济条件下的内生增长模型,文章探讨了国际贸易、环境质量与经济持续增长三者的内在关系以及相互作用的动力机制。首先,通过对模型的竞争性市场均衡分析,给出了平衡增长路径的经济增长率,并系统地分析了在环境污染进入效用函数的情形下长期经济增长的内在机理。其次,通过对最优增长路径进行比较静态分析,分别讨论了贸易自由化对环境质量、经济增长、福利效应的影响;污染外部性对长期经济增长的约束等。最后给出了模型的综合结论及其现实涵义。     

Endogenous Growth Cycles in Continuous Time

The endogenous dynamics of a closed constant returns multi-market economy are examined in which agents face downward sloping demand. The trigger for growth in this model is a technological change that warrants costly adjustment in input quantities by agents. In the resulting dynamic game, relative prices within markets remain constant. Consequently, all own price elasticities are constant. In markets characterized by lower cost of capital the unique outcome is collusion in which agents do not incur adjustment cost and there is no adoption of new technology. But in other markets a unique non-cooperative equilibrium exists in which agents do incur the cost of adopting the new technology. Only three specifications of adjustment costs are feasible. Output increases along an S-shaped time path with or without a non-explosive cyclical component.     

内生城市增长理论模型与实证研究述评

城市增长是现代经济增长理论研究和实证研究的重要内容。城市增长理论可划分为内生城市增长理论和外生城市增长理论。本文重点阐述三个城市内生增长模型即外部性城市增长模型、新经济地理城市增长模型和超边际城市增长模型及其主要思想;围绕“人力资本积累”和“产业聚集”对城市增长的影响,综述相关经验研究;简单总结和评述内生城市增长模型,为进一步研究中国城市增长提供理论借鉴和经验参考。     

Polluting Non-Renewable Resources and Growth

In an endogenous growth model with human capital accumulation, we introduce non-renewable resources which cause flow pollution problems. In this set-up the negative external effect of pollution on productivity does not cause any distortions in the economy: The market economy will achieve the optimal extraction and growth rates. Consequently, emission taxes are unnecessary and, when introduced, will have no effect on the economy. The more important is the negative pollution externality, the larger will be the optimal long-run growth rate (which may be either positive or negative). In the case of a positive human capital externality, consumption in the market economy may approach zero in the long run, although positive consumption growth is socially optimal. Growth-enhancing policies do not necessarily cause a larger drain in the resource stock.     

城镇化:经济可持续增长的新引擎——基于人力资本积累的角度

结合中国城镇化的特点,对贝克尔的人力资本模型和罗默的内生增长模型进行了调整,并以此为基础分析了城镇化通过人力资本积累影响经济增长的机制和作用效果. 研究发现,城镇化将从成本和收益两个方面影响人力资本投资决策,带来平均受教育年限的增加和人力资本专业化程度的提高,增加人力资本积累,并最终促进经济的可持续增长. 在此基础上,利用2005~2012年全国31个省份的面板数据对城镇化、人力资本积累与经济增长之间的关系进行了实证分析. 结果显示,通过人力资本积累这一途径,城镇化水平提高可以极大地促进经济增长.     

Comparison Utility in a Growth Model

We examine the dynamics of two endogenous-growth modelsin which agents have comparison utility. In the inward-lookingeconomy, individuals care about how their current consumptioncompares with their own past consumption. In the outward-lookingeconomy, they care about how their own consumption compares withother peoples consumption. In response to a negative shock tocapital, saving and growth will temporarily fall in both of themodels that we consider but will remain constant in a model withstandard preferences. The decline will be smaller in the outward-than in the inward-looking case, but utility will be lower inthe former case because of a negative externality.     

税收、财政支出与内生经济增长

构建了基于财政支出、税收的内生经济增长模型,并推导出在给定税收、财政支出政策的变化路径时,经济会达到竞争性分散均衡,税率与经济增长存在倒-U型关系,政府投资性支出与经济增长之间正相关。利用中国省际面板数据进行实证检验显示,在我国经济运行中,总产出、消费、投资、政府投资性支出、税率、利息率、工资水平之间存在长期均衡关系。我国宏观税率为28.63%时达到最优值,政府投资性支出对经济增长率存在正向影响,但不同区域间存在较大差异性。