Conditioning manager alphas on economic information: another look at the persistence of performance

This article presents evidence on persistence in the relativeinvestment performance of large, institutional equity managers.Similar to existing evidence for mutual funds, we find persistentperformance concentrated in the managers with poor prior-periodperformance measures. A conditional approach, using time-varyingmeasures of risk and abnormal performance, is better able todetect this persistence and to predict the future performanceof the funds than are traditional methods.     

陕西农村科技推广体系与模式研究

构建市场导向,社会化服务与政府的支持保护相结合,具有陕西特色的多元化、多层次、组织化、法制化的农村科技推广体系及模式是当前推进陕西省农业现代化、增加农民收入、提高农村经济实力的合理模式选择.     

Voting with their feet: Relative economic conditions and state migration patterns

Over the past decade, state and local policymakers and business leaders across the U.S. have expressed concern regarding the ability to attract and retain skilled workers, given the economic climate of their states compared with other parts of the nation. Examining the factors underlying state-level migration trends is important to determine what role, if any, public policy might play in addressing their potential impact on local labor supply. Using data from the Internal Revenue Service for each of the 48 states in the continental United States from 1977 through 2006, this paper examines the role of three economic factors—namely labor market conditions, per capita incomes, and housing affordability—in determining domestic state-to-state migration flows. Estimates from a logistic model of out-migration show that while all three measures of relative economic conditions are significant determinants of migration, the magnitude of their impact varies and has changed considerably over time. For example, the importance of per capita income as a determining factor has fallen considerably since the late 1970s, while that of housing affordability has risen. Interestingly, the role of labor market conditions—while significant throughout the entire 30-year period—was most prominent in the late 1980s and early 1990s. Estimates from the model are used to forecast migration for 2009 for selected states. The results from this exercise are surprisingly accurate when compared to actual state migration patterns for that year.     

参与发展:上海构建和谐旅游城市的理论与实践

"旅游促进发展"已成为共识。随着上海都市旅游发展的深入,出现了许多不和谐现象和负面效应,特别是对本地居民利益保护的缺位现象等日益凸现。为了促进上海都市旅游和谐发展,在探析和谐旅游城市构建中引入参与发展理念,具有重要的理论与实践指导意义。     

颠覆性技术从边缘力量如何成为未来主流？ ——基于技术－应用－生态的视角

颠覆性技术会对主流技术轨道以及行业市场格局乃至国际竞争规则产生颠覆性效果,如何从边缘力量成为未来主流,对于科技自立自强具有现实意义。基于创新理论构建技术-应用-生态（TAE）框架,对颠覆性技术的演化路径及其作用机制进行分析。研究表明,颠覆性技术由边缘力量到未来主流是一个系统变革,具有由萌生→丛生→递归的技术生成动态演化轨迹、由初始场景→中阶场景→目标场景→未来场景的应用跃迁路径,以及树状→环状→网状的创新生态变革过程,并受到技术的融合发展、技术－应用的深层互动,以及后发优劣势动态转换的竞争机制等综合作用,从边缘力量到未来主流存在技术分叉、应用跃迁、生态协同三大后发优势转换的临界条件。最后从重视技术科学、加强需求侧管理、优化创新生态、把握政策时机等方面得到政策启示。     

服务外包与国内就业:基于全球15个国家25个行业的实证分析

利用2000年和2005年的投入产出表数据,计算了世界15个主要发包国25个行业的服务外包率,并建立计量模型实证分析了服务外包对发包国国内就业的影响。研究结果表明,从总体上看,服务外包对发包国国内就业的影响方向是不确定的,正负效应主要取决于服务外包量的大小、外包对国内就业的替代效应和规模效应以及外包环节的类型;对绝大多数国家而言,服务外包的就业效应是不显著的,仅是影响国内就业的弱因素,工资水平和产业规模是影响各国国内就业的重要因素。