Mixed Oligopoly and Environmental Policy

We show in this paper that when there are both public and private firms in product markets (a mixed oligopoly) the decision whether to privatize a public firm interacts with the environmental policy of governments. Therefore, the outcome of the decision whether to privatize a public firm may be different if the government internalizes the environmental damage than if the government ignores it. When the government sets a tax to protect the environment, the tax is lower in the mixed oligopoly than in the private one even though the environmental damage is greater. In the mixed oligopoly the marginal cost of the public firm is lower than the market price.     

Timing of Entry under Externalities

Received August 23, 2000; revised version received May 14, 2001     

国际多市场寡头条件下的贸易政策和产业政策

国际多市场寡头是Bulow( 1 985)提出的多市场寡头概念在国际贸易领域的自然延伸。在本文中 ,市场之间联系的纽带是本国企业具有规模收益递减的生产技术。本文的主要结论是 ,第一 ,如果本国企业与外国企业在外国市场进行价格竞争 ,那么 ,最优干预组合包括国内生产补贴与出口税 ,它们对本国福利的作用是一致的。第二 ,如果本国企业与外国企业在外国市场进行数量竞争 ,那么 ,最优干预政策组合包括国内生产补贴与出口补贴 ,它们作用于本国福利的方向是不一致的 ,这时 ,本国政府用国内生产补贴执行反托拉斯职能 ,用出口补贴执行利润转移职能。第三 ,作为模型的一个应用 ,本文论证了出口退税政策会加剧国内市场的扭曲 ;而且它不一定能够提高本国福利。     

Information Advantage in Cournot Oligopoly

Consider an oligopolistic industry where firms have access to the same technology but are asymmetrically informed about the environment. Even though it is commonplace to think that in this context superior information leads to higher profits, we find that under Cournot competition this is not generally the case: It holds when firms' technology exhibits constant returns to scale, but it does not necessarily hold otherwise. Journal of Economic Literature Classification Numbers: C72, D43, L13.     

Mixed Oligopoly at Free Entry Markets

We investigate the optimal behavior of a public firm in a mixed market involving private firms and one public firm. Existing works show that welfare-maximizing behavior by the public firm is suboptimal when the number of firms is given exogenously. We allow free entry of private firms and find that, in contrast to the case with the fixed number of firms, welfare-maximizing behavior by the public firm is always optimal in mixed markets. Furthermore, we find that mixed markets are better than pure markets involving no public firm if and only if the public firm earns nonnegative profits.     

寡头垄断行为模型的统一：推测变量法

推测变量法是哈佛学派SCP范式的理论基础。本文利用推测变量法对一些典型寡头垄断模型进行了统一,本质地 揭示了这些模型的差异但是推测变量取值范围的不同,并指出在实际运用推测变量法中所应注意的问题。     

Partial Privatization in a Differentiated Mixed Oligopoly

A model of differentiated mixed oligopoly is developed to systematically discuss the welfare consequences of partial privatization of a public firm. We analytically derive the optimal degree of partial privatization not only in the short run with restricted entry but also in the long run with free entry. It is shown that the short-run optimal policy is non-monotonic in the degree of love of variety, while the optimal degree of privatization is monotonically increasing in the consumer's preference for variety in the long run.      

Endogenous Timing in a Mixed Oligopoly with Foreign Competitors: the Linear Demand Case

We introduce foreign private firms into the model of Pal (1998) and investigate the impact of the introduction of foreign private firms on the endogenous timing in a mixed oligopoly in the linear demand case. We find that the public firm chooses to be a follower of all domestic private firms and that the public firm chooses not to be a leader of all foreign private firms, which is in contrast to Matsumura (2003).     

Time Preference, Stock Externalities and Strategic Reactions

This paper examines the relationship between the rateof time preference and strategic reactions in dealing with climate change caused by anthropogenic greenhouse gas (GHG) emissions. Treating climate change as stock externalities, the RICE model (Nordhaus and Yang [1996]) is employed in this paper for simulation studies. The simulation results show that when regions' rate of time preference in evaluating climatechange is sufficiently low, the paths of efficient GHGemission reduction measurement and the inefficient Nash equilibrium outcome are close. The paper also provides general interpretations of such phenomena. Finally, the implications of a low rate of time preference on GHG emission reduction policies are discussed.     

Bilateral Oligopoly,Private Information,and Pollution Permit Markets

We analyze the effects of strategic behavior and private information in pollution permit markets in which all firms have market power. The market is characterized by supply-function equilibria. Firms submit net supplies for permits and a market maker determines the market-clearing price. Net supplies depend on abatement cost functions, which in turn depend on private information parameters. We calculate the increase in aggregate abatement costs due to strategic behavior and private information and show that private information attenuates the effects of strategic behavior.      

Demand-Creating R&D in a Symmetric Oligopoly

Spillovers with demand-creating research and development (R&D) activities are investigated by revisiting a widely employed market share rivalry demand structure. Positive technological spillovers may inflict positive or negative side effects on rivals and this has important implications for the effects on innovative efforts of loose or tight R&D cooperation in symmetric oligopolies. A comparison with the effects that apply with linear demand structures and implications for empirical research are also touched upon.     

寡占市场下的广告成因探究

依照微观经济学和产业组织理论,高度集中产业市场中的寡头厂商往往会在价格变量上形成暗中或默契的价格串谋,使产业市场处在一种“准完全垄断”的状态。广告是企业主要的非价格竞争变量之一,重复博弈的结果使得寡头厂商能够走出囚徒困境(放弃产品的广告宣传),而垄断利润的存在导致第三方潜在进入的威胁,在位寡头厂商必然会联合起来进行抵制,通过广告串谋提高市场进入壁垒。     

The Complete Welfare Effects of Cost Reductions in a Cournot Oligopoly

This paper provides the smallest upper bound or the critical level for a Cournot firm's market share below which its cost reduction reduces welfare. It shows that a firm's cost reduction increases social welfare with nonlinear demand and nonlinear costs if and only if its market share is above the critical level, which is equal to a weighted sum of the other firms' market shares. The paper also reports similar results for technological spill-overs within any given set of firms.     

Relative Emission Standard versus Tax under Oligopoly: The Role of Free Entry

We compare the effects of an emission tax, and those of a relative emission standard, on welfare and pollution levels under oligopolistic market structures. We consider the cases where the number of firms is fixed and where there is free entry and exit of firms. When the number of firms is fixed, (i) a relative emission standard is welfare-superior to an emission-equivalent emission tax, and (ii) an emission tax is emission-superior to a welfare-equivalent relative emission standard. Under free entry and exit, the results are just the opposite when the inverse demand function is concave.     

Nuclear Power, Externalities and Non-Standard Pigouvian Taxes

The external effects arising from the use of nuclear power are, in a fundamental way, related to uncertainty. In this paper we locate these external effects and derive a dynamic Pigouvian tax in order to make the decentralized economy support the command optimum. Another interesting result is that a small constant energy tax (which we interpret as a second best policy) can take the decentralized economy reasonably close to the command optimum.     

Trading Taxes vs. Paying Taxes to Value and Finance Public Environmental Goods

The potential sensitivity of environmentalresource valuation to payment vehicles is ofinterest to researchers and decision-makersinvolved in estimating and applying thesenumbers. A conceptual model is developed whichprovides insight into how the different paymentvehicles of a special tax and a taxreallocation affects the willingness to pay(WTP) for environmental goods. Hypothesistesting using contingent valuation datasuggests WTP with a tax reallocation is higherthan WTP with a special tax for ground waterquality protection in Georgia and Maine, USA.Technical measurement and welfare analysisimplications and limitations of valuing andfinancing public environmental goods using taxrealloactions are discussed.     

国有银行控股比例与管理授权——基于混合寡占模型的研究

本文结合中国银行业竞争日趋激烈的现实背景,从国有银行股份制改革和管理授权入手构建了银行业混合寡占、国有银行混合持股的两阶段古诺竞争模型,分析国有银行为达到既定目标如何选择国有控股比例及适当的管理激励合同。研究表明,国有银行会选择利润收益合同作为占优管理授权,而放弃相对表现激励合同;当国有银行将最大化社会福利作为目标时,国有银行成为市场垄断者,私有银行被挤出市场;仅在利润收益激励合同下,国有银行将最大化利润和消费者剩余之和作为目标。     

基于技术外溢性的寡头垄断企业研发投资的动态博弈分析

在现代经济社会条件下,企业通过合作研发可以使研发的外部效应内部化,激励企业进行更多的研发活动。同样,合作企业可以共享信息和研究成果,提高研发效率。本文将结合企业研发投资过程中的实际情况,在假定技术不完全独占即存在技术溢出的情况下,通过构建一个两阶段寡头博弈模型对寡头垄断企业R＆D进行研究,比较寡头垄断企业在合作研发与非合作研发两种情况下研发投入、产出、社会福利的变化,从中探求合作研究的原因。     

我国农村金融“双失灵”及其矫正路径

农村经济社会发展离不开农村金融的支持,但我国农村金融却长期存在着市场与政府的"双失灵"问题.政府对农村金融的不恰当的干预不仅未能有效弥补市场机制的缺陷,相反还加剧了农村金融市场失灵,因而政府失灵是农村金融失灵的核心.只有正确处理好政府与市场的关系、合理界定政府与市场的边界、培育和完善农村金融市场,才能有效解决农村金融失灵问题.并提出了矫正我国农村金融"双失灵"的基本思路.     

集群外部性的发生机制

集群外部性是产生于集群化企业的产业特征或集群自身的特征的外部性,它们在企业集群的演变中起着重要作用。但是,直到今天,人们对它们的发生机制还是所知甚少。通过网络型相互作用的发生机制主要涉及集群区域品牌效应、社会资本累积效应等集群外部性;通过基于市场机制的相互作用的发生机制主要涉及集群中的货币外部性;通过策略性相互作用的发生机制主要涉及集群中的策略性外溢。