Germany’s changing airport infrastructure: the prospects for ‘newcomer’ airports attempting market entry

Despite fluctuations for economic or political reasons, the number of passengers and volume of cargo carried by air is growing quickly, leading to a shortage of airport capacity in some European regions with few slots available at some hubs. This problem has accelerated the trend towards an increase in airport capacity for larger aircraft everywhere, a process which started in the UK and is now continuing throughout Europe, especially in Germany. Apart from development at the hubs, however, many small airports have also been enlarged, former military airbases have been converted to civilian use, and new runways are to be built in areas away from centres of population. These changes have occurred within a short period of time. In Germany, the number of available airports with runways over 1800 m will have doubled in a period of 10–15 years.     

Do Industries Explain Momentum?

This paper documents a strong and prevalent momentum effect in industry components of stock returns which accounts for much of the individual stock momentum anomaly. Specifically, momentum investment strategies, which buy past winning stocks and sell past losing stocks, are significantly less profitable once we control for industry momentum. By contrast, industry momentum investment strategies, which buy stocks from past winning industries and sell stocks from past losing industries, appear highly profitable, even after controlling for size, book-to-market equity, individual stock momentum, the cross-sectional dispersion in mean returns, and potential microstructure influences.     

Arbeiten 4.0 — Folgen der Digitalisierung für die Arbeitswelt

Digitalisation will not only lead to the disappearance of jobs, the creation of new jobs and changing skill requirements in many existing jobs. It also leads to fundamental challenges for existing qualification systems as well as labour law and labour relations. New digital technologies pervasively change the content and organisation of work. They may have an impact on the actual weekly working time hours and the adoption of self-managed working time systems. The consequences, however, may differ for each worker. Accordingly, economic and policy conclusions cannot be derived for the labour market as a whole. Workers‘qualifications need not only to be adapted to changing occupational tasks. Work intensification and increasing communication flows have to be addressed as well. Furthermore, adequate human resources policies can foster the proper use of new flexible work arrangements. Crowdworking as a specific form of flexible work, however, has to be primarily integrated in existing labour legislation. That is one opinion, another author considers the forecasts doomsday prophecies that call for political action or amending the regulative framework. And he suggests that the characteristics of the digital transformation of work may mainly be firm-specific. In a social-scientific perspective there is no deterministic relationship between technology and work but the development of work has to be regarded as a strategic and political design project.     

自然经济体系、食物链与禽鸟病毒传染

本文在自然经济的基础上,创建并论证了由草木、禽鸟和细菌组成的食物链及其微观和宏观经济影响.并将其应用于分析当前由H5N1类型病毒传染引起的禽鸟死亡现象可知:第一,具有双向前级让渡(级中投入)交换优势的自然市场短暂性的失去了平衡;第二,超级"自然王国"已经为全部生物种群按其信息与其适应性作出了持续性反应,以克服负面冲击;第三,生物种群的进化将跃上一个新的高度.     

Gut versorgt nach der Herz-OP

Pflegerische Betreuung kardiochirurgischer Kinder - Herzfehler sind die h?ufigsten angeborenen Erkrankungen und machen oft noch im ersten Lebensjahr eine korrigierende Operation erforderlich. Um den Therapieerfolg zu sichern, ben?tigen die Kinder auch nach der Operation eine intensive überwachung. Festgelegte Handlungsanweisungen sorgen dafür, dass keine Komplikationen übersehen werden.     

Estimating demand systems when outcomes are correlated counts

We describe and employ a Bayesian posterior simulator for fitting a high-dimensional system of ordinal or count outcome equations. The model is then applied to describe the multiple site recreation demands of individual agents, and we argue that our approach provides advantages relative to existing methods commonly applied in this area. In particular, our model flexibly adjusts to match observed frequencies in trip outcomes, permits a flexible correlation pattern among the sites visited by individuals, and the posterior simulator for fitting this model is relatively easy to implement in practice. We also describe how the posterior simulations produced from the model can be used to conduct a variety of counterfactual experiments, including predicting behavioral changes and describing welfare implications resulting from shifts in exogenous demographic and site characteristics. We illustrate our method using data from the Iowa Lakes Project by modeling the visitation patterns of individuals to a set of twenty-nine large Iowa lakes. Consistent with previous findings in the literature, we see strong evidence that own and cross-price effects on trip demand are negative and positive, respectively, that higher income increases the likelihood of visiting most sites, and that a commonly used indicator of water quality, Secchi transparency, is positively correlated with the number of trips taken. In addition, the correlation structure among the errors reveals a complex pattern in which unobserved factors affecting trip demand are generally (though not strictly) positively correlated across sites. The flexibility and richness with which we are able to characterize the demand system provides a solid platform for counterfactual analysis, where we find significant behavioral and welfare effects from changes in site availability, water quality, and travel costs.