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首页> 外文期刊>Journal of Economic Dynamics and Control >Market structure and endogenous productivity growth: how do R&D subsidies affect market structure?
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Market structure and endogenous productivity growth: how do R&D subsidies affect market structure?

机译：市场结构和内生生产力的增长：研发补贴如何影响市场结构？

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Conclusions about optimal R&D policies in existing endogenous growth models rely on strong assumptions regarding market structure. In particular, each industry is dominated by a single monopoly in most models or firms are cast as oligopolistic or monopolistic competitors. A model which combines the endogenous growth framework with the Ericson and Pakes (Rev. Econom. Stud. 62 (1995) 53) model of industrial dynamics is proposed to allow for direct market competition between multiple firms in each industry. Thus key features of competition through R&D typically missing in most endogenous growth models are introduced, including: (1) non-degenerate entry and exit; (2) distribution of firm sizes; and (3) more complex market structures that vary across industries and over time. This paper presents the partial equilibrium for a single industry demonstrating how growth-promoting R&D subsidies alter the endogenously determined market structure. Subsidies to R&D 'stretch' the distribution of market shares with an increased number of firms in the market but a higher variance in the market shares across firms.
机译：现有内生增长模型中最佳R＆D政策的结论依赖于有关市场结构的强大假设。特别是，在大多数模型中，每个行业都由单个垄断主导，或者公司被视为寡头或垄断竞争者。提出了将内生增长框架与Ericson和Pakes（Rev. Econom。Stud。62（1995）53）模型结合起来的模型，以允许每个行业中多个公司之间的直接市场竞争。因此，介绍了大多数内生增长模型中通常缺少的通过研发进行竞争的关键特征，包括：（1）不变质的进入和退出； （2）企业规模分布； （3）更复杂的市场结构，该结构随行业和时间而变化。本文介绍了单个行业的局部均衡，展示了促进增长的研发补贴如何改变由内生决定的市场结构。随着市场中企业数量的增加，对研发的补贴“扩大了”市场份额的分布，但是企业间市场份额的差异更大。

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