试论人力资本的投资回报路径

人力资本与物质资本虽然在生产经营过程中关系密切,但由于两者的投入性质和方式不同,投资回报的性质和路径也不同。研究和区分人力资本与物质资本的不同投资回报路径,把握人力资本投资回报路径的特性,有利于政府在公共管理中推动人力资本的生成,有利于完善激励机制,发挥人力资本的潜能。     

Trades and Quotes: A Bivariate Point Process

This article formulates a bivariate point process to jointlyanalyze trade and quote arrivals. In microstructure models,trades may reveal private information that is then incorporatedinto new price quotes. This article examines the speed of thisinformation flow and the circumstances that govern it. A jointlikelihood function for trade and quote arrivals is specifiedin a way that recognizes that an intervening trade sometimescensors the time between a trade and the subsequent quote. Modelsof trades and quotes are estimated for eight stocks using Tradeand Quote database (TAQ) data. The essential finding for thearrival of price quotes is that information flow variables,such as high trade arrival rates, large volume per trade, andwide bid–ask spreads, all predict more rapid price revisions.This means prices respond more quickly to trades when informationis flowing so that the price impacts of trades and ultimatelythe volatility of prices are high in such circumstances.     

新形势下施工企业管理理念探讨

随着中国市场经济体制改革的深化，世贸经济组织的加入，建筑市场环境的变化，企业改制及经营特型的开展，施工企业如何立足于国内市场，打入国际市场，面临着又一次大发展的机遇与挑战。本文通过综合分析，对我国建筑施工企业管理思想提出了一些初步的看法，供有关管理人员参考。     

投资资本权利扩张与管制的辩证法--FTAA投资规则的规范分析

文章对FTAA有关投资规则进行了规范分析,并在与NAFTA有关规定进行比较的基础上,对FTAA投资规则草案所反映的投资资本权利扩张和东道国对其的管制之间的博弈关系进行了思考.     

The mean-variance investment problem in a constrained financial market

This paper extends the mean-variance analysis and the two-fund separation theorem to a market with some constraints, such as, the incompleteness, prohibition of short-selling, and partial information, with stochastic interest rate, and with stochastic volatility for risky assets. By maximizing a quadratic utility of terminal wealth, we show that the efficient frontier for the problem is a straight line in the mean-standard-deviation diagram. The quadratic utility function exhibits mean-variance efficiency. Our results apply to portfolios of claims in a single period, multiperiod, and continuous time.     

试论市场经济条件下的经济计划

在商品货币关系广泛存在的情况下,要想恰当有效地按比例分配社会劳动时间,既离不开市场的作用,也离不开计划的作用。这既为资本主义社会的实践所证明,也为社会主义社会的实践所证明。对这个问题进行深层次的分析,可以从生产关系与生产力、上层建筑与经济基础的关系上,从计划与市场的内在统一性上。从计划与市场两种手段的不同特点上找到理论根据。在市场经济条件下,并不排斥计划的作用,但计划工作必须进行改革使之与发展市场经济相适应。     

The division of labour and market structure

Most firms produce most of the time under conditions of substantial economies of scale. The division of labour, according to Adam Smith the mainspring of wealth, is intrinsically an economies of scale phenomenon. Market structure in most industries in characterized by a small number of suppliers and a larger number of customers. I explain this law of small numbers as the equilibrium of two forces: the deconcentration effect of imitation and the market spliting effect of further refinements in the division of labour by innovation. A deconcentrated market creates larger incentives for market splitting (product differentiation) by innovation than a concentrated market. But market splitting raises concentration in the market and it raises the number of different markets in the economy. Before the economies of scale of old products are fully exploited, new products are being offered which again are produced under conditions of economies of scale.     

我国资本市场存在的制度功能缺陷与对策

我国资本市场是在新旧体制转换中建立起来的，先天就存在着制度和市场功能方面的缺陷，亟需要采取有效应对策略以弥补，使我国资本市场的发展走上正常轨道。     

全面理解人力资本的经济价值——教育经济学与培训经济学的融合

教育经济学不应只是正规学校教育的经济学,在终身学习的理念下,正规学校教育的结束并不意味着学习步伐的停滞和人力资本投资的终结。教育经济学未来拓展的路径,除了理论基础上的"外延式"发展外,还可以在原有的人力资本理论框架内走一条"内涵式"发展的道路,即强调综合考察人力资本投资的多种途径,特别是教育和培训这两种最主要的人力资本投资形式,让教育经济学走出正规学校教育经济学的固有领地,团结在人力资本理论的名义下,与培训经济学融合,走向人力资源开发研究的广阔天地,惟其如此,才能全面、深入地研究人力资本的经济价值及其实现机制。     

FACTORS THAT AFFECT THE LONG‐TERM SURVIVAL OF MICRO,SMALL AND MEDIUM ENTERPRISES IN ETHIOPIA

There is an increasing recognition of the potential importance of micro, small and medium enterprises (MSMEs) for employment, income and poverty reduction in Ethiopia. Although the MSME sector contributes significantly to the national economy, the high failure rate among well established small businesses and enterprises is a matter of major concern. A random sample of 500 small businesses and enterprises selected from five major cities in Ethiopia were followed up for 6 years in order to assess the impact of influential factors that affect the long‐term survival and viability of small enterprises. Hazard ratios estimated from the Cox Proportional Hazards Model were used to quantify the impact of key predictors of survival. Businesses that ceased operation were characterised by inadequate finance (61%), low level of education (55%), poor managerial skills (54%), shortage of technical skills (49%), and inability to convert part of their profit to investment (46%). The study shows that participation in social capital and networking (iqqub schemes) was critically helpful for long‐term survival. Businesses that did not participate in iqqub schemes regularly were found to be 3.25 times more likely to fail in comparison with businesses that did. Results of the study have implications that could be used for developing policy initiatives that are aimed at fostering long‐term growth in small businesses and enterprises.