Giffen goods and market making

Summary. This paper shows that information effects per se are not responsible for the Giffen goods anomaly affecting traders demands in multi asset noisy, rational expectations equilibrium markets. The role that information plays in traders strategies also matters. In a market with risk averse, uninformed traders, informed agents have a dual trading motive: speculation and market making. The former entails using prices to assess the effect of error terms; the latter requires employing them to disentangle noise traders demands within aggregate orders. In a correlated environment this complicates the signal extraction problem and may generate upward sloping demand curves. Assuming (i) that competitive, risk neutral market makers price the assets or that (ii) uninformed traders risk tolerance coefficient grows unboundedly, removes the market making component from informed traders demands rendering them well behaved in prices.Received: 30 April 2002, Revised: 3 December 2003, JEL Classification Numbers: G100, G120, G140.Support from the Barcelona Economics Program of CREA and the Ente per gli Studi Monetari e Finanziari Luigi Einaudi, are gratefully acknowledged. I thank Anat Admati, Jordi Caballé, Giacinta Cestone, and Xavier Vives for useful suggestions. The comments provided by the Associate Editor and an anonymous referee greatly improved the papers exposition.     

绿色农业信息化建设初探

农业信息化是我国绿色农业可持续发展的主要保障.在分析了当前我国绿色农业信息化建设的现状和问题的基础上,提出了加快农业信息化建设步伐,促进我国绿色农业发展的对策措施.     

Income Redistribution with Well-Informed Local Governments

This paper examines the problem of redistributing incomeacross jurisdictions and to mobile workers within jurisdictionswhen local governments have better information than the centralgovernment about local production conditions. Under the centralgovernments optimal policy, the subsidies or taxes that localgovernments provide to mobile workers normally depend on whetherthese governments are net recipients or net donors of interjurisdictionalincome transfers. Moreover, the public-input decisions of somelocal governments are distorted. The analysis demonstrates thatit may not be desirable to harmonize social policies across jurisdictions,even when the beneficiaries are quite mobile.     

基于计算机信息集成技术的房产管理信息系统

基于计算机信息集成技术的房产管理信息系统是房管部门实现房产管理现代化的一种重要途径。这种系统不但具有房产信息管理的输入、查询、检索、修改、计算、统计等一般功能，而且在信息集成技术的支持下还可以实现信息的数据集中、网络共享、并行处理、数据完整等优点。本详细探讨了这种基于计算机信息集成技术的房产信息管理系统系统分析、系统设计以及系统实施等几个重要开发过程的设计思想和作业内容，对计算机信息集成技术的相关内容也进行了一定介绍。     

Voluntary disclosure and information asymmetry in Denmark

This paper examines if the level of voluntary disclosure affects information asymmetry for industrial companies listed on the Copenhagen Stock Exchange. Economic theory suggests that disclosing more information should lower the information asymmetry component of a firm's cost of capital [Leuz, C., & Verrecchia, R. E. (2000)]. The results indicate that voluntary disclosure is negatively associated with proxies for information asymmetry. The results are robust even after controlling for various firm characteristics introduced in related literature. Despite differences in institutional settings the findings in our paper are similar to the ones based on US data.     

美国证券法对衍生交易市场风险披露的监管及借鉴——以SEC“305规则”体制的监管要求为视角

在以市场风险披露为基础的衍生交易监管政策下,SEC的“305规则”体制由定量、定性信息披露要求与前瞻性信息披露的安全港规则有机构成。我国应当借鉴先进的风险监管规则,构建创新的衍生工具市场风险披露法律框架,并解决好创新规则实施过程中的成本-收益权衡问题、收益波动性问题。     

信息不对称条件下经济组织监管方式的分析:对我国公立医院改革模式的讨论

随着我国由计划经济体制向社会主义市场经济体制的过渡,仍然会有一定数量的国有医院要由国家直接控制经营。并需要相应的治理结构来规范其运行。本文的结果表明,在经济学理论上,公立医院的经营目的决定了产权改革既不是提高其经营绩效的充分条件,也不是必要条件。我们的理论分析否定了“产权优先”的改革观点,而为进一步完善公立医院治理结构的改革步骤提供了理论支持,并给出一定改革措施建议。另外,本文在理论上首次提出了非对称信息企业内部的“信息悖论”问题。这个广泛的结论不仅对于医院的改革是成立的,对于其他具有相同信息特征的企业都有理论意义。     

价格信息发布、消费者偏好差异与价格离中现象

本文运用博弈论方法研究互联网市场信息服务商的收费策略。互联网市场信息服务商的收入,来源于向厂商收取的信息发布费用。和向消费者收取的信息订阅费用。本文解释了,为什么目前大多数提供价格信息的网站只向厂商收取信息发布费用,而对消费者提供完全免费的服务。本文所建立的模型显示,如果互联网市场的规模足够小,消费者的信息订阅策略对信息服务商的收费足够敏感,则完全免费策略是信息服务商的最优策略。     

Accounting conservatism in a setting of Information Asymmetry between majority and minority shareholders

Following LaFond and Watts (2008), we examine the relation between information asymmetry (as measured by PIN, probability of information-based trading) and accounting conservatism but focus on a country – Taiwan – whose institutional background is different from that of the United States. Due to the disparate degree of conservatism across the world, the conclusions of LaFond & Watts (2008) might not be universally applicable. Our findings support, in general, the applicability of their conclusion to a Taiwan data set. We find, however, that the effect of PIN appears weaker when auditor tenure is taken into account, thus supplementing their conclusions.     

信息经济学视角下农户对信息需求的困境

本文运用信息经济学基本理论对农户信息需求不足的问题进行了分析,认为农户信息搜寻成本过高、农业信息市场不完善、农户自身素质偏低是农户信息需求面临困境的主要原因。并在此基础上提出加强农户的组织化水平,建立、健全农业信息经纪人制度,开发针对基层农户的农业信息市场模式,加强对农户的基础教育和职业教育等措施以提高农户的信息需求水平。