MIGRATION AND AGGLOMERATION WITH KNOWLEDGE SPILLOVERS*

In this paper, a Grossman–Helpman–Romer‐type endogenous growth model is developed that incorporates two regions and mobile workers. While the linkage between final goods firms and intermediate goods firms is strong, the linkage between innovation activities and manufacturing activities is weak in our paper. It is possible for the economy to reach either full agglomeration, partial agglomeration, or segmented agglomeration. We find that mobile workers acquire the highest welfare under full agglomeration. However, under segmented agglomeration, the welfare of skilled workers is not necessarily the lowest.     

生产性服务业与下游企业的集聚研究:以广州市银行业为例

随着城市之间贸易的深入发展,现阶段中国城市化的一个重要特征就是生产性服务业向各城市群中心城市的集聚日益增长。本文以广州市四大国有商业银行为例,对生产性服务业与下游制造业的集聚进行了理论建模和实证分析。其结论认为:在理论上控制生产性服务业与下游制造业集聚的参数主要有中间服务与最终产品的运输成本和二者的边际产品以及中间服务的供应价格等;由于现阶段中国的生产性服务在城市之间的贸易程度尚较低,因此它们和制造业中的中间产品及最终产品生产企业既有集聚式分布又存在分散式布局模式,现代中国大都市的生产性服务业与下游企业的区位主要以集聚式布局为主要特征。     

Agglomeration in a vertically-related oligopoly

This paper examines the location of three vertically-linked firms. In a spatial economy composed of two regions, a monopolist firm supplies an input to two consumer goods firms that compete in quantities. It is concluded that agglomeration is more likely to occur when the ratio between the transport cost of the intermediate good and the transport cost of the final good is higher. If this proportion is low, the likelihood of an agglomeration decreases with transport costs. If the ratio has an intermediate value, a non-monotonic pattern is obtained that is different from Krugman and Venables (1995).Received: October 2004, Accepted: March 2005, JEL Classification: C68, F12, F15, R12, R13This paper had the support of the Research Unit on Complexity in Economics (UECE). The author wishes to thank Masahisa Fujita, Armando Pires and an anonymous referee for helpful comments. The usual disclaimer applies.     

Skill distribution and income disparity in a North‐South trade model

Abstract. What are the impacts of free trade agreement on the welfare of different types of workers in a developed country? What is the impact of free trade on a developed country's income disparity? What is the effect of free trade on the skill distribution of a developed country? The objective of this paper is to address the above questions in a two‐sector general‐equilibrium North‐South trade model in which both countries produce one final good and one high‐tech intermediate input. The final good is produced with the use of a high‐tech intermediate input and unskilled workers. Horizontally differentiated skilled workers produce the high‐tech intermediate input. Each country is populated by a continuum of unskilled workers with differential potential ability. Workers in the North and South can acquire skills by investment in training or education. Thus, skill distribution in the North and South is determined endogenously in the model through a self‐selection process. I characterize two different types of equilibria: a closed‐economy equilibrium without trade and a free trade equilibrium. Then, I investigate the impact of free trade, in the presence of training costs, on the skill distribution within each country, income disparity, and social welfare. JEL classification: D63, F10, J31     

Firm productivity and agglomeration economies: evidence from Egyptian data

This paper attempts to shed the light on the nexus between firms’ productivity and economies of agglomeration in Egypt. Using a large dataset of firms in 342 firms’ four-digit activities in 27 regions (62,108 firms), we introduce three measures of agglomeration which are urbanization or firm diversification measured by the number of firms by governorate, localization and specialization measured by the average productivity by governorate and sector (generating externalities and knowledge spillovers) and finally competition measured by the number of firm operating in the same governorate and the same sector. We find strong evidence for the existence of agglomeration in Egypt after controlling for firm age, location, economic activity and legal status. In the Egyptian context, productivity spillovers gained from agglomeration measures outweighed the negative effects of competition implied by congestion. The latter is chiefly due to the lack of good infrastructure. When regressions are run by firm size, location and activity, our main findings show first that micro and small firms are more likely to benefit from localization and diversification compared to medium and large firms. Service firms benefit more from high level of diversification while manufacturing firms gain more benefits from knowledge spillovers and specialization in Egypt.     

Franchise fee,contract bargaining,and economic growth

This paper combines the industrial organization (IO) theory and the R&D-based endogenous growth theory in a model of a successive imperfect competitive economy. The current study assumes that firms between upstream and downstream industries bargain over both the price of intermediate goods and the franchise fee. Findings show that the intermediate goods firm with a R&D sector charges the price equal to the marginal cost. Economic rent may also be partly transferred into the franchise fee determined by the relative bargaining power. In particular, the traditional double marginalization result, such as in Spengler (1950), does not take place here due to the above-mentioned bargaining scheme. Finally, this work shows that final goods firms in vertically linked industries play an important role in an economic growth model. The more bargaining power the final goods firms have (or the more returns to specialization upstream firms have, or the less substitution elasticity the final goods have), the more the economy grows. However, the consumer preference for diversity seemingly does not affect economic growth rate.     

垄断竞争、中间产品与城市规模

从分工经济与城市规模之间关系的角度,运用Dixit-Stiglitz模型框架下经济活动的规模收益递增原理,在城市内部最终产品生产企业利润最大化的条件下,系统讨论了投入的中间产品种类数与城市人口规模之间的关系、中间产品之间的替代性对城市均衡人口规模的反馈作用,以及城市内部中间产品专业化水平和互补经济程度之间的关系。在此基础上,利用广东省城市增长的部分数据进行了实证分析。认为:经济活动的集聚形成了城市;在城市体积增长和城市系统随产业的专业化与多样化发展而演进的过程中,城市规模经济的实现除了依赖生产要素流动外,最终产品生产企业对中间产品投入的需求也具有不可忽视的作用。     

The spatial sorting and matching of skills and firms

Abstract .  In this paper we make use of a matched employer-employee database for Italy to look at the spatial distribution of wages. Using this rich database we aim to open up the black box of agglomeration economies exploiting the micro dimension of interaction among economic agents, both individuals and firms. We provide evidence that firm size and, especially, skills are sorted across space and account for a large portion of the spatial wage variation. Our data also support the assortative matching hypothesis, which we show not to be driven by co-location of good workers and firms. Finally, we point out that assortative matching is negatively related to local market size.     

CBD hypothesis and economies of agglomeration

Economies of agglomeration as a rationale for the formation of central business district of a city is examined. In a simultaneous location problem of firms and workers on a line segment, a locational interaction effect among firms is introduced. As an optimal solution to the cost minimization problem, a locational pattern is obtained in which the outermost zone is occupied by workers, the middle zone by firms, and the innermost zone by both workers and firms.     

跨国公司全球化生产模式的理论分析——基于行业的视角

本文在迪克希特-斯蒂格里茨(D-S)垄断竞争模型的基础上,建立了一个3×2×2模型,分析了不同行业特性对跨国公司生产模式的影响.结果表明,跨国公司的生产模式和其自身行业特性有很大关系,某一生产环节投资的固定成本越低,跨国公司越倾向于将其转移到低成本国家;东道国市场规模越大,越有利于吸引跨国公司投资;成品的交易成本越高,跨国公司越倾向于采取本地组装的生产模式;中间品交易成本越高,跨国公司越倾向一体化的生产模式,将中间品和组装放在一起,分散在多国生产.该模型的分析结果和现实情况基本吻合,对分析跨国公司如何在全球组织其生产活动具有很好的解释力.     

开发区与企业动态成长机制*--基于企业进入、退出和增长的研究

开发区的高速增长到底是源自寻求“政策租”所导致的短期“虚假繁荣”,还是通过集聚效应推动企业迅速成长而形成的长期表现？回答好这一问题,对于开发区政策的效果评价和进一步完善至关重要。然而,现有研究对此却语焉不详。文章在识别开发区企业的基础上,实证检验了开发区对企业进入、退出和成长的作用,以及开发区增长效应的可持续性,揭示了开发区影响地区经济增长的微观机制。研究发现：(1)开发区会吸引高效率企业进入,并降低开发区内企业的退出风险,从而使得开发区内净进入企业数目显著增加,这意味着开发区政策是吸引企业入驻并加强集聚经济的重要因素;(2)开发区显著提高了企业的就业增长、生产率增长和销售增长,这表明开发区政策和集聚经济的增长效应十分明显;(3)企业“入驻”开发区初期,“政策租”带来了短期的快速增长,而开发区内自我加强的集聚经济对企业成长具有长期的促进作用,这说明开发区的增长效应具有可持续性。文章肯定了开发区实践对企业动态成长的长期积极影响,这不仅为开发区政策绩效的评估提供了更为全面的认识,而且也为开发区的进一步发展和完善提供了重要启示。     

Self-organized agglomerations and transport costs

This paper investigates the impact of the shape of transport costs on the structure of spatial equilibria. We consider a racetrack economic model in which firms and workers freely locate on the continuous space of a circumference. We present “reasonably” weak conditions on the shape of transport costs under which continuous distributions of firms and workers are never stable equilibria. We also characterize conditions on the shape of transport costs under which discrete distributions are stable equilibria. The results confirm the idea that agglomeration of firms and workers in few cities is a natural outcome of economic interactions.     

Agglomeration economies and location choice of Korean manufacturers within the United States

Employing the micro data for 1997–2004, we investigate the location decision of Korean-affiliated manufacturing investments in the United States. The conditional logit estimates confirm that although industry-specific Korean agglomeration and domestic agglomeration play an important role, the Foreign Direct Investment (FDI) location is more sensitively affected by the interstate difference in endowment conditions than by the same nationality agglomeration. Both business service and intermediate good agglomeration are main determinants of FDI location. Furthermore, estimation results show substantial change in the location pattern after recovery from the Asian financial crisis. We find quite different patterns of location decision across industry groups; dispersion forces work greater than the agglomeration force in the consumer goods industry, forward linkages with US upstream firms can be seen in the assembly and processing industry, and typical follow-the-leader pattern mixed with market potential effect by Korean immigrants is seen in the basic material manufacturing industry.     

Effects of vertical integration on price and volume: An empirical inquiry

A simple model with two stages of production is used for deriving some empirically testable hypotheses. Firms (two upstream and two downstream) in the industry are either vertically integrated or not, hence the industry has three alternative patterns: Complete unintegrated, partially integrated, or fully integrated.Final good prices, outputs and profits of firms are different in each integration pattern but what is optimal can not be stated (i.e., pay-offs are much too complicated in order to solve the sub-game equilibrium).The essential feature of the model is that there are external markets for the intermediate inputs. Hence input trade between the four firms/divisions need not balance since excess supply or demand is traded at the external market. With this feature purely downstream exogenous shocks have no effect on upstream pricing nor production decisions if all four firms are unintegrated. Such exogenous shocks have non-zero effects if at least one firm is vertically integrated. There are also other dissimilarities in comparative statics of each industry integration pattern.An indirect method to test the effects of vertical integration on price and volume is presented and empirically tested. Depending on the vertical integration pattern of an industry exogenous shocks have dissimilar effects on prices and outputs of the final and intermediate good. A four equations system is estimated by using Finnish forest industry firm data. Final good demand rise has a reducing effect on both paper and pulp prices. Stumpage prices (upstream marginal costs) have a negative impact on paper and pulp production and a positive impact on prices. These effects from upstream (downstream) stage into downstream (upstream) market should not occur when all firms are unintegrated.This is a revised version of a paper which was presented at seminars at Brussels, Turku, Vienna, and Stuttgart. I would like to thank seminar participants (specially Frank Schmid) and anonymous referees for helpful comments. Financial support from the Marcus Wallenberg Foundation is gratefully acknowledged.     

Skill-replacing process innovation and the labour market: Theory and evidence

I study the differential impacts of product innovation and process innovation on the labour market. Using European data from 2000 to 2018, I find that industries with proportionally more firms reporting product innovation than process innovation also tend to exhibit a lower income share of low-skilled workers. To better understand the mechanism, I develop a dynamic growth model in which firms conduct both types of innovation endogenously. In the model, product innovation introduces new intermediate goods, which tend to require high-skilled workers to implement. Process innovation simplifies existing production technologies and thereby allows firms to replace high-skilled workers with low-skilled ones. I calibrate an extended version of the model to the largest two industries in UK in 2014 and 2018, respectively. I find that product innovation has become less costly but increasingly demanding for skills, and the cost of process innovation has increased on average and become more diverse across firms.     

The microfoundations of business cycles: an evolutionary, multi-agent model

This work presents an evolutionary model of output and investment dynamics yielding endogenous business cycles. The model describes an economy composed of firms and consumers/workers. Firms belong to two industries. The first one performs R&D and produces heterogeneous machine tools. Firms in the second industry invest in new machines and produce a homogenous consumption good. Consumers sell their labor and fully consume their income. In line with the empirical literature on investment patterns, we assume that firms’ investment decisions are lumpy and constrained by their financial structure. Simulation results show that the model is able to deliver self-sustaining patterns of growth characterized by the presence of endogenous business cycles. The model can also replicate the most important stylized facts concerning micro- and macro-economic dynamics.     

REGIONAL SPECIALIZATION,URBAN HIERARCHY,AND COMMUTING COSTS*

We consider an economic geography model of a new genre: All firms and workers are mobile and their agglomeration within a city generates costs through competition on a housing market. In the case of two sectors, contrasted patterns arise. When one good is perfectly mobile, the corresponding industry is partially dispersed whereas the other is agglomerated, thus showing regional specialization. When one sector supplies a nontradeable consumption good, this sector is more agglomerated than the other. The corresponding equilibrium involves an urban hierarchy in that a larger array of varieties of the two goods is produced within the same city.     

THE PROVISION OF PUBLIC INPUTS AND FOREIGN DIRECT INVESTMENT

A small open economy model is developed that incorporates direct and indirect effects on multinational location decisions associated with public input provision. It is shown that when agglomeration externalities are present in local intermediate goods markets, public input provision can affect multinational firms directly by lowering the fixed costs of production and indirectly by decreasing the costs of intermediate inputs, but growth is contingent on achieving a critical mass of investment. It is further shown that the effectiveness of a policy of public input provision over a policy of subsidy incentives is critically dependent on key market parameters in the host country . ( JEL F2, H4, O1)     

Growth and Agglomeration

This article presents a model in which growth and geographic agglomeration of economic activities are mutually self-reinforcing processes. Economic agglomeration in one region spurs growth because it reduces the cost of innovation in that region through a pecuniary externality due to transaction costs. Growth fosters agglomeration because, as the sector at the origin of innovation expands, new firms tend to locate close to this sector. Agglomeration implies that all innovation and most production activities take place in the core region. However, as new firms are continuously created in the core, some relocate their production to the periphery.