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.     

阻碍资本外流契约对区域经济的影响

阻碍资本外流契约不仅影响资本优化配置,也削弱代理人在优惠回报契约中的谈判力,从而使区域经济难以实现效用最大化.同时,在存在代理人道德风险的情况下,阻碍资本外流契约所规定的撤资高额违约金会妨碍区域经济总效用最大化的实现.应从制度上消除区域内外资本的等级差别,规定区域融资契约合理的法定有效期,并制定强有力的法律来制止区域融资主体迫使投资者与之签订只体现自己意愿的阻碍资本外流契约.     

转轨中国公共品导出机制中的政府行为分析

本文从政府角度出发,对公益品和私益品的特性进行了重新思考,从偏好、福利二分、绩效衡量难易、制度环境、意识形态等角度考察政府行为的独特性.并以我国体制转轨的特殊时期为背景,分析了不同于西方代议制的政体下,在公共品导出机制中政府行为的复杂性,指出了制度上的缺陷和由此导致的一系列现实问题.     

关于社会保险的深层次思考

正确认识社会保险税并非一般意义上的税，而是介于税费之间，从而跳出了目前的费改税之争，对当前我国社会保障制度的构建具有重要的指导作用。关于社会保险模式的选择，结合我国实际，针对不同群体可选择“并列型和个人主导型”。运用收支两条线和提高社会保障立法层次构建起社会保障运行的制约机制。同时，要在工会的参与实施下，通过制度规则建企，构建社会保险的补充形式，如企业保险、社区互助等。     

An optimization approach to business buyer choice sets: How many suppliers should be included?

In many new or repeat purchasing situations, business buyers must decide how many suppliers to consider (a “choice set”) in determining which supplier(s) to actually buy from or contract with. This paper develops an optimization approach to determining the size of the choice set, taking into consideration buyer utility and search and evaluation costs. A theoretical model is developed for both one-time and repeat purchase situations. The model is estimated using empirical data received from bids received for procurement auctions. In these auctions, suppliers provide bids for steel pipe based on two product attributes (price and delivery time). Model sensitivity to small changes in parameters is also tested.     

Expected exponential utility maximization of insurers with a Linear Gaussian stochastic factor model

In this paper, we consider the problem of optimal investment by an insurer. The wealth of the insurer is described by a Cramér–Lundberg process. The insurer invests in a market consisting of a bank account and m risky assets. The mean returns and volatilities of the risky assets depend linearly on economic factors that are formulated as the solutions of linear stochastic differential equations. Moreover, the insurer preferences are exponential. With this setting, a Hamilton–Jacobi–Bellman equation that is derived via a dynamic programming approach has an explicit solution found by solving the matrix Riccati equation. Hence, the optimal strategy can be constructed explicitly. Finally, we present some numerical results related to the value function and the ruin probability using the optimal strategy.     

取消农业税后河北省农村公共产品供给体制重构研究

中国农村公共产品供给体制存在先天性缺陷,取消农业税,一方面使这一体制进一步削弱,另一方面也为体制的重构提供了契机。河北省农村公共产品供给体制的重构,核心是重新划分各级政府在不同种类公共产品供给上的职责,并建立与其相适应的财力保证制度、激励与监督制度。     

从多个视角看公共组织的内在性问题

公共组织的内在性是指公共组织确立的用来指导、管理和评估机构运行及其成员行为的标准或目标,这些标准或目标在很大程度上反映了公共组织的内部利益而非社会利益。文章从公共物品、公共组织的特性和政治"市场失灵"三个视角对公共组织内在性问题进行分析,认为这三个方面构成了内在性作用的载体、来源和机制。     

试论我国电子商务发展的对策措施

随着计算机技术、网络技术和通讯技术的发展和应用,商务活动的国际化、信息化和无经纸化已成为各国商务发展的潮流,电子商务作为一种全新的商务方式应运而生,掀起一场全球性的贸易革命。我国在电子商务发展中应该采取积极的对策措施,以期引起有关部门、企业等的关注,共同推动我国电子商务的快速发展。     

试论消费税税制改革与完善

目前,消费税成为世界各国广泛研究的课题,在税收政策中扮演越来越重要的角色。我国自1994年1月开始征收消费以来,消费税收入从514．07亿元增长到1634亿元,翻了3倍。但是,由于消费税是一个与社会发展同步的税种,同时我国的消费税税制处于发展的初级阶段,现行消费税税制还存在一些问题。2006年4月1日,我国对消费税税制做了一次重大的调整,是自实行消费税以来第一次重大变革,为以后的进一步完善消费税指明了方向。