Monopolistic competition,as you like it

We explore monopolistic competition with asymmetric preferences over a variety of goods provided by heterogeneous firms, and compute equilibria (approximating Cournot and Bertrand equilibria when market shares are negligible) through average Morishima elasticities of substitution. Further results concerning pricing and entry emerge under homotheticity and when demands depend on a common aggregator, as with Generalized Additively Separable preferences. Under additivity we can determine which goods are going to be provided under free entry, as well as the selection effects associated with changes in market size, consumers' income, aggregate productivity, and preference parameters.     

C337. Misspecified location and scale. 11. independence of and s2

A hierarchical Bayesian approach to the problem of estimating the largest normal mean is considered. Calculation of the posterior mean and the posterior variance involves, at worst, 3-dimensional numerical integration, for which an efficient Monte Carlo method of evaluation is given. An example is presented to illustrate the methodology. In the two populations case, computation of the posterior estimates can be substantially simplified and in special cases can actually be performed using closed form solutions. A simulation study has been done to compare mean square errors of some hierarchical Bayesian estimators that are expressed in closed forms and several existing estimators of the larger mean.     

Object-oriented design of a distributed agent-based framework for e-Procurement

Procurement is an important function in any manufacturing organization and it also has strategic business value attached to it. Hence, any improvements in the process would result in tremendous benefits. E-Procurement exploits the Internet and agent technologies to conduct procurement-related processes. In this paper, we design and develop a software agent-based framework for a typical e-Procurement process by decomposing it into three business processes: e-Negotiations, reverse auctions and e-Settlement. The artefacts of the system for each of the three business processes have been designed and developed using Unified Modeling Language (UML). A prototype of one of the processes, viz. reverse auction, has also been implemented.     

Communication With Unknown Perspectives

Consider a group of individuals with unobservable perspectives (subjective prior beliefs) about a sequence of states. In each period, each individual receives private information about the current state and forms an opinion (a posterior belief). She also chooses a target individual and observes the target's opinion. This choice involves a trade‐off between well‐informed targets, whose signals are precise, and well‐understood targets, whose perspectives are well known. Opinions are informative about the target's perspective, so observed individuals become better understood over time. We identify a simple condition under which long‐run behavior is history independent. When this fails, each individual restricts attention to a small set of experts and observes the most informed among these. A broad range of observational patterns can arise with positive probability, including opinion leadership and information segregation. In an application to areas of expertise, we show how these mechanisms generate own field bias and large field dominance.     

The Role of Automatic Stabilizers in the U.S. Business Cycle

Most countries have automatic rules in their tax‐and‐transfer systems that are partly intended to stabilize economic fluctuations. This paper measures their effect on the dynamics of the business cycle. We put forward a model that merges the standard incomplete‐markets model of consumption and inequality with the new Keynesian model of nominal rigidities and business cycles, and that includes most of the main potential stabilizers in the U.S. data and the theoretical channels by which they may work. We find that the conventional argument that stabilizing disposable income will stabilize aggregate demand plays a negligible role in the dynamics of the business cycle, whereas tax‐and‐transfer programs that affect inequality and social insurance can have a larger effect on aggregate volatility. However, as currently designed, the set of stabilizers in place in the United States has had little effect on the volatility of aggregate output fluctuations or on their welfare costs despite stabilizing aggregate consumption. The stabilizers have a more important role when monetary policy is constrained by the zero lower bound, and they affect welfare significantly through the provision of social insurance.     

大学生村官创业群体的异质资源联合效应——以江西省H市大学生村官创业群体为个案

立足异质资源联合与联盟管理能力协调机制的视角,个案实证调查表明,大学生村官创业需要借助大学生村官联合组织的联盟管理能力优势,发挥大学生村官创业者自身的知识技能和所在地资源禀赋优势.通过大学生村官所在地的异质资源联合,加上大学生村官所在地的大学生村官群体上级管理组织和大学生村官群体的行业协会组织形成的联盟管理能力协调机制,可以助推大学生村官创业成功,从而形成以大学生村官创业为典范、当地村民为创业主体的创业集群效应,真正构建起新型农业经营体系,推进现代农业转型升级发展.     

看守所狱侦耳目的终结

在侦押一体的体制下,长期以来,我们事实上赋予了看守所侦查的职能。看守所除了监管犯罪嫌疑人外,还要协助公安机关办案人员侦查破案,开展深挖余罪活动,这致使看守所狱侦耳目日渐制度化,助长了刑讯逼供、牢头狱霸和超期羁押等问题的滋生,导致了一系列冤假错案的发生,使看守所部分失去了保障犯罪嫌疑人和被告人人权的职责意识。因此,我们应当趁着制定《看守所法》这一历史性契机,明确宣布废除看守所狱侦耳目制度,并为彻底将其埋葬创设配置制度。     

基于伪最近邻节点的异构无线网络组网实现及仿真

网络的出现,改变了很多人工作和生活的习惯,作为现代信息技术的基础,网络技术的发展速度很快,传统的有线网络已经开始很少使用,在实际的网络建设中,主要采用新兴的无线网络,本文在伪最近邻节点概念的基础上,对ISIS等网络传输协议进行了分析,最后对基于伪最近邻节点的异构无线网络组网实现及仿真,进行了深入的研究.     

非均质性砂砾岩储层渗透率预测方法研究

针对测井储层评价中的渗透率预测问题，基于相控建模理念，采用流动单元分析法，将所研究工区划分为4个特征明显的流动单元；采用最能表征储层储集性能的声波时差、补偿密度、补偿中子、自然伽马、流动层带指数进行模糊聚类分析，选取最大隶属度大于70%的最优样本进行建模，得到流动单元的判别模型；建立了复杂砂砾岩储层渗透率模型，提高了储层流体渗透性能的预测精度，为非均质储层物性认识提供了参考方法。     

信贷扭曲下系统性风险形成和“双支柱”政策协调问题研究——基于异质性企业的视角

我国国有企业和私营企业在信贷获取和生产效率上的差异性会扭曲信贷资源配置,进而抬高宏观杠杆率,增加系统性风险。本文基于抵押约束机制构建了包含异质性企业的动态随机一般均衡模型,从理论上分析了由企业信贷扭曲引起的系统性风险形成机制,并探讨了货币政策和宏观审慎政策"双支柱"调控的协调问题。研究发现：在异质性企业环境下,宏观审慎政策通过减缓信贷市场顺周期行为,抑制信贷规模过度膨胀,起到降低宏观杠杆率、防范系统性风险的作用,并显著改善社会福利损失,为货币政策制定创造更多空间;货币政策与宏观审慎政策"双支柱"的调控框架仅减缓了抵押约束机制对经济周期的放大效应,未解决异质性企业对经济结构的扭曲问题。因此,深化供给侧结构性改革,提高国有企业市场竞争力和自负盈亏能力,充分发挥市场对资源的配置作用,是建立"去杠杆"长效机制、提高金融韧性以形成能够内生消化风险的市场环境的关键所在。