Interpretation problems of the partial correlation with nonnormally distributed variables

The partial correlation is a commonly used measure for assessing the bivariate correlation of two quantitative variables after eliminating the influence of one or more other variables. The partial correlation is generally interpreted as the correlation that would result if the variables to be eliminated were fixed (not allowed to vary and influence the other variables), which is referred to in the statistical literature as conditional correlation. The present paper demonstrates, by means of theoretical derivations and practical examples, that when the assumption of multivariate normality is violated (e.g., as a result of nonlinear relationships among the variables investigated) the usual interpretation of the partial correlation coefficient will be basically incorrect. In extreme cases the value of the partial correlation coefficient may be strongly positive, close to 1, whereas the conditional correlation may have a large negative value. To solve this problem the paper suggests to partial out a certain function (in most cases the square) of the variables whose effects are to be eliminated if nonlinear relationships are likely to occur.     

Second‐Generation Immigrants in the Swedish Labour Market

This study focuses on the labour market performance among second‐generation immigrants in Sweden. One motivation behind the analysis is that it gives insight into the long‐term consequences of immigration. Labour market performance relates the probability of having a job, referred to here as a threshold effect and to the differences in income from work, given that a person is in the market and is referred to as an income from work effect. We have shown that a clear threshold effect of being a second‐generation immigrant exists and that different groups of second‐generation immigrants perform differently in the Swedish labour market.     

利用生产停顿机会进行维修以提高产量

介绍Statoil公司提出的机会维修概念和它对生产所起的重要作用,举例说明机会维修的可行性,并对机会维修进行优化使它更好地为生产服务.     

Costs and benefits of Danish active labour market programmes

Since 1994, unemployed workers in the Danish labour market have participated in active labour market programmes on a large scale. This paper contributes with an assessment of costs and benefits of these programmes. Long-term treatment effects are estimated on a very detailed administrative dataset by propensity score matching. For the years 1995 – 2005 it is found that private job training programmes have substantial positive employment and earnings effects, but also public job training ends up with positive earnings effects. Classroom training does not significantly improve employment or earnings prospects in the long run. When the cost side is taken into account, private and public job training still come out with surplusses, while classroom training leads to a deficit.     

Asset pricing with loss aversion

The use of standard preferences for asset pricing has not been very successful in matching asset price characteristics, such as the risk-free interest rate, equity premium and the Sharpe ratio, to time series data. Behavioral finance has recently proposed more realistic preferences such as those with loss aversion. Research is starting to explore the implications of behaviorally founded preferences for asset price characteristics. Encouraged by some studies of Benartzi and Thaler [1995. Myopic loss aversion and the equity premium puzzle. The Quarterly Journal of Economics 110 (1), 73–92] and Barberis et al. [2001. Prospect theory and asset prices. Quarterly Journal of Economics CXVI (1), 1–53] we study asset pricing with loss aversion in a production economy. Here, we employ a stochastic growth model and use a stochastic version of a dynamic programming method with an adaptive grid scheme to compute the above mentioned asset price characteristics of a model with loss aversion in preferences. As our results show using loss aversion we get considerably better results than one usually obtains from pure consumption-based asset pricing models including the habit formation variant.     

Farmers,Middlemen and Exporters: A Model of Market Power,Pricing and Welfare in a Vertical Supply Chain

Markets for cash‐crops in developing countries are typically characterized by a concentration of buyer power at different levels of the supply chain. For instance, small‐scale coffee farmers sell their produce to a middleman, who in turn sells the coffee onward to an exporter, often a foreign multinational, with monopsony power in the hands of the purchasers at both levels. We analyze pricing behavior and welfare with different assumptions regarding market power. In particular, we show that a more powerful exporter is likely to benefit the producers and may even lead to higher welfare for the producer country as a whole.     

Das Finanzierungssystem der EU und die Nettozahlerdebatte

Die deutsche Nettozahlerposition innerhalb der EU wird in der ?ffentlichen Meinung h?ufig kritisch beurteilt. Wie funktioniert das Finanzierungssystem der EU? Worauf l?sst sich die Auszahlungsstruktur zurückführen? Ist der Nutzen der EU-Mitgliedschaft allein anhand der Zahlungsstr?me zu messen? Prof. Dr. Lars P. Feld, 40, ist Inhaber des Lehrstuhls für Finanzwissenschaft am Alfred-Weber-Institut für Wirtschaftswissenschaften der Ruprecht-Karls-Universit?t Heidelberg und Mitglied des wissenschaftlichen Beirats des Bundesministeriums der Finanzen; Dr. Jan Schnellenbach, 33, ist wissenschaftlicher Assistent am Alfred-Weber-Institut.     

Investment liberalization — Why a restrictive cross-border merger policy can be counterproductive

Investment liberalizing countries are often concerned that cross-border mergers and acquisitions, in contrast to greenfield investments, might have an adverse effect on domestic firms and consumers. However, given that domestic assets are sufficiently scarce, we identify a preemption effect and an asset complementarity effect, which imply that the acquisition price is substantially higher than the domestic seller's profits. Moreover, we show that for the acquisition to take place, the MNE must be sufficiently efficient when using the domestic assets, otherwise rivals will expand their business, thereby making the acquisition unprofitable. Consequently, restricting cross-border M&As may also hurt consumers.     

How Economic Incentives May Destroy Social,Ecological and Existential Values: The Case of Executive Compensation

Executive compensation has long been a prominent topic in the management literature. A main question that is also given substantial attention in the business ethics literature—even more so in the wake of the recent financial crisis—is whether increasing levels of executive compensation can be justified from an ethical point of view. Also, the relationship of executive compensation to instances of unethical behavior or outcomes has received considerable attention. The purpose of this paper is to explore the social, ecological, and existential costs of economic incentives, by discussing how relying on increasing levels of executive compensation may have an adverse effect on managerial performance in a broad sense. Specifically, we argue that one-dimensional economic incentives may destroy existential, social, and systemic values that influence the manager’s commitment to ensure responsible business conduct, and have negative spillover effects that may reduce the manager’s performance. There are well-documented findings that demonstrate that reliance on sources of extrinsic motivation (such as economic incentives) may displace intrinsic motivation. Our perspective is a holistic one, in the sense that we will explore the influence of sources of extrinsic motivation on the manager’s intrinsic commitment to different types of values. We will in particular investigate how it may influence the manager’s ethical reflection and behavior or lack thereof.