What drives the choice of the type of partner in R&D cooperation? Evidence for Spanish manufactures and services

We analyse the heterogeneity in firms’ decisions to engage in R&D cooperation, taking into account the type of partner (competitors, suppliers or customers, and research institutions) and the sector to which the firm belongs (manufactures or services). We use information from the Technological Innovation Panel (PITEC) for Spanish firms and estimate multivariate probit models corrected for endogeneity which explicitly consider the interrelations between the different R&D cooperation strategies. We find that placing a higher importance to publicly available information (incoming spillovers), receiving public funding and firm size increase the probability of cooperation with all kind of partners but the role is much stronger in the case of cooperative agreements with research institutions and universities. Our results also suggest that R&D intensity and the importance attributed to the lack of qualified personnel as a factor hampering innovation are key factors influencing positively R&D cooperation activities in the service sector but not in manufactures.     

动力机械实验课程建设与实验教学改革与实践

实验教学在机械类专业教育中具有不可替代的功能和作用。为适应机械类专业知识体系发展需求,我们进行了动力机械实验课程建设与实验教学改革,构建了＂三层次三结合＂的的实验课程教学新体系,提升学生的创新意识和实践能力。     

品牌经济学的理论基础——引入品牌的需求曲线及其经济学分析

需求定律是经济学分析的理论基础之一,品牌经济学的理论基础为引入品牌的需求曲线或考虑选择成本的需求定律。把品牌引入经济学中后,品牌信用度的提高使需求曲线右移并变得更为陡峭,同时品牌信用度的提高改变了需求曲线的位置,使得均衡价格提高,均衡数量增加,增加了消费者剩余和生产者剩余,提高了社会福利水平。文章为“品牌战”替代“价格战”提供了理论依据,即通过品牌建设提高品牌信用度,使得在价格提高的条件下需求量增加,而这只有在需求曲线改变位置时方能做到。     

参与PPP能否减轻企业税负——基于准自然实验的证据

政府与社会资本合作（PPP）模式在解决公共服务供给不足问题的同时,也给社会资本方的经营带来影响。企业参与PPP与政府建立良好合作关系是否有助于其税负的减轻？基于PPP概念股上市公司数据,本文采用准自然实验框架实证研究了企业参与PPP对其税负的影响。研究结果表明：企业参与PPP提高了其避税程度,降低了税负水平。分行业看,建筑业效应在统计上最为显著,而电力、热力等市政建设类项目企业参与PPP后税负不降反升。分区域看,东部和中部地区企业参与PPP对其税负有显著的降低,而西部地区并不显著。政策启示是在严格执行显性税收优惠的同时,规范PPP项目中政府与企业之间的利益关系。     

Labour adjustment costs: Estimation of a dynamic discrete choice model using panel data for Greek manufacturing firms

In this paper we estimate a dynamic structural model of employment at firm level. Our dataset consists of a balanced panel of 2790 Greek manufacturing firms. The empirical evidence of this dataset stresses three important stylized facts: (a) there are periods in which firms decide not to change their labour input, (b) there are periods of large employment changes (lumpy nature of labour adjustment) and (c) the commonality is employment spikes to be followed by smooth and low employment growth periods. Following Cooper and Haltiwanger [Cooper, R.W. and Haltiwanger, J. “On the Nature of Capital Adjustment Costs”, Review of Economic Studies, 2006; 73(3); 611–633], we consider a dynamic discrete choice model of a general specification of adjustment costs including convex, non-convex and “disruption of production” components. We use a method of simulated moments procedure to estimate the structural parameters. Our results indicate considerable fixed costs in the Greek employment adjustment.     

浅析我国发展企业绿色物流的战略选择

在全球大力提倡经济可持续发展的今天,现代化物流的发展必然能够为企业提供更长久的发展动力。我国的企业想要在世界经济大发展的趋势下获得更多的公众信任和资本青睐,必然要走企业绿色物流的发展道路。文中在比较欧美日与国内企业绿色物流发展现状的基础上进行了分析并提出了我国发展企业绿色物流的三种战略选择,希望能够通过绿色物流的发展压缩国内企业贸易成本,化解绿色壁垒带来的经营风险,增强物流国内企业应对市场挑战的能力并抢得市场先机。     

Time-varying parameters in the almost ideal demand system and the Rotterdam model: will the best specification please stand up?

This article assesses the ability of the Rotterdam Model (RM) and of three versions of the Almost Ideal Demand System (AIDS) to recover the time-varying elasticities of a true demand system and to satisfy theoretical regularity. Using Monte Carlo simulations, we find that the RM performs better than the linear-approximate AIDS at recovering the signs of all the time-varying elasticities. More importantly, the RM has the ability to track the paths of time-varying income elasticities, even when the true values are very high. The linear-approximate AIDS, not only performs poorly at recovering the time-varying elasticities but also badly approximates the nonlinear AIDS.     

Do Inflation‐Linked Bonds Still Diversify?

The diversifying power of inflation-linked (IL) bonds relative to traditional asset classes has changed significantly. In this paper, we study the dynamics of conditional volatilities and correlations for three asset classes, IL bonds, nominal bonds and equities, in the USA and Europe. Using a DCC-MVGARCH for the period 1997–2007, we highlight the change that took place in 2003. Although IL bonds once had definite diversification power, they are now highly correlated with nominal bonds and have reached similar volatility levels. As a result, the two asset classes are practically substitutable. This seems to be due to more stable inflation expectations and to a more liquid IL bond market. Although diversification was a valuable reason for introducing IL bonds in a global portfolio before 2003, this is no longer the case. Dynamic portfolio optimisation using our estimates of conditional correlations and volatilities clearly demonstrates that the optimal weight of IL bonds in a portfolio decreased sharply in 2003 in favour of nominal bonds and equities.     

浅析高校开设实验经济学的意义与方法

在经济信息化、全球化、一体化迅猛发展的背景下,如何培养和造就适合当今社会发展的经济管理类应用型人才成为财经类院校的新课题。加强实验室建设,则成为培养人才的必要手段之一。本文通过引入目前西方的一些研究经验,结合理论经济学对实验室建设的要求,具体对高校开设实验经济学、建立经济学实验室的必要性、意义和方法进行了探讨。     

Students' Characteristics and Performance in Economic Statistics

The vast majority of studies in college economics have dealt with the introductory principles course. In one of the rare research projects dealing with other courses, Professor Cohn attempts to identify factors affecting student performance in economic statistics. He considers such variables as grade point average, graduate vs. undergraduate status, major field, sex and credits in economics, mathematics and statistics. There are a few recognized limitations to his model, but the reader will find some of his results to be surprising indeed.