Innovativer Energiespeicher Bundeswasserstraßen

The present analysis provides a contribution to the question of how a system integration of large-scale energy storages can be implemented. It is to be investigated if and how federal waterways can be used for this purpose. Initially, a baseline study was carried out in which the federal waterways are systematically assessed with regard to their suitability for/as energy storage systems. Apart from the technical and the hydro mechanical implementation of the storage process, the advantages and disadvantages of the federal waterways in comparison to conventional pump storage stations play a significant role. A presentation and classification of the potentially available canal sections provides an overview of the suitable storage systems of the federal waterways. A specifically designed storage simulation on the basis of a sample application is used, in order to determine the capacity of the canal system for energy storage. Consequently, the simulation showed the theoretical capability of the federal waterways as energy storage systems, through their ability to balance the load and temporal fluctuations of the energy input. The simulation program Matlab was used on the basis of the synthetic load and delivery profiles. Finally, based on the example of the ships lock in Uelzen and the Scharnebeck boats lift, a simulation of the possible re-equipping options will be described, technically abstracted, economically analysed and combined with renewable energy facilities within a virtual power plant. The detailed formulation of further approaches and the calculation of possible application scenarios play a central role within this analysis.     

Limits to arbitrage and hedging: Evidence from commodity markets

We build an equilibrium model of commodity markets in which speculators are capital constrained, and commodity producers have hedging demands for commodity futures. Increases in producers' hedging demand or speculators' capital constraints increase hedging costs via price-pressure on futures. These in turn affect producers' equilibrium hedging and supply decision inducing a link between a financial friction in the futures market and the commodity spot prices. Consistent with the model, measures of producers' propensity to hedge forecasts futures returns and spot prices in oil and gas market data from 1979 to 2010. The component of the commodity futures risk premium associated with producer hedging demand rises when speculative activity reduces. We conclude that limits to financial arbitrage generate limits to hedging by producers, and affect equilibrium commodity supply and prices.     

A theorem on translations by Hille,and its interpretation from the point of view of the theory of probability

Abstract

The Taylor expansion of a function around a point a may, as is well-known, be formally written      

Corporate leverage and the collateral channel

We investigate whether and how corporate leverage depends on the structure of corporate assets. Based on a large panel dataset of US firms from 1990 to 2010, we show that property, plant and equipment are important drivers of the collateral channel, while inventories and receivables are less important. The collateral channel is more pronounced for firms that have to rely on banks and trade creditors to raise debt finance, but it has become weaker for these firms after the start of the financial crisis. Our study provides new evidence on the cross-sectional and time-varying importance of the collateral channel for corporate leverage.     

Do Alternative Real Estate Investment Vehicles Add Value to REITs? Evidence from German Open-ended Property Funds

Besides the more commonly used REITs, German investors can also invest in a lesser-known real estate vehicle, Open-ended Property Funds. OPFs are considered a compromise between listed and direct real estate investments. OPF fund managers generally provide daily (perfect) liquidity. However, if liquidity falls below 5%, share redemptions in these funds can be temporarily suspended for a period of up to two years. During this time, investors will only be able to sell shares on the secondary market (exchange), and are thus subject to significant liquidity risk. The objective of this paper is to analyze whether OPFs add value to investor portfolios above that provided by REITs. We show that OPFs have a diversification advantage over REITs in low-risk portfolios, despite their larger potential liquidity risk. REIT liquidity is comparable to that of ordinary common stock, but OPFs exhibit an average initial discount to funds’ NAV of about 6% when share redemptions are temporarily suspended. However, in the long-run, this potential redemption suspension does not negatively influence OPF performance (in case OPFs reopen again). This makes OPFs an attractive investment alternative to REITs for investors who have a high level of risk aversion and a long-term investment horizon, such as endowments, insurance companies, and pension funds.     

The evolving domain of entrepreneurship research

Research on entrepreneurship has flourished in recent years and is evolving rapidly. This article explores the history of entrepreneurship research, how the research domain has evolved, and its current status as an academic field. The need to concretize these issues stems partly from a general interest in defining the current research domain and partly from the more specific tasks confronting the prize committee of the Global Award for Entrepreneurship Research. Entrepreneurship has developed in many sub-fields within several disciplines—primarily economics, management/business administration, sociology, psychology, economic and cultural anthropology, business history, strategy, marketing, finance, and geography—representing a variety of research traditions, perspectives, and methods. We present an analytical framework that organizes our thinking about the domain of entrepreneurship research by specifying elements, levels of analysis, and the process/context. An overview is provided of where the field stands today and how it is positioned relative to the existing disciplines and new research fields upon which it draws. Areas needed for future progress are highlighted, particularly the need for a rigorous dynamic theory of entrepreneurship that relates entrepreneurial activity to economic growth and human welfare. Moreover, applied work based on more careful design as well as on theoretical models yielding more credible and robust estimates seems also highly warranted.     

Gender and self-selection into a competitive environment: Are women more overconfident than men?

Using a large running race in Sweden, this study shows that there are male-dominated environments in which the selection of women who participate are more likely to be confident/competitive and that, within this group, performance improves equally for both genders in absolute terms.     

Cross-border acquisitions and taxes: efficiency and tax revenues

Abstract .  We develop a theoretical oligopoly model to study how international differences in profit and capital gains taxes affect foreign acquisitions. Reductions in foreign profit taxes tend to trigger inefficient foreign acquisitions, while reductions in foreign capital gains taxes may trigger efficient foreign acquisitions. Foreign acquisitions can increase domestic tax revenues even when profit taxes are evaded. The reason is that bidding competition between foreign firms ensures that all benefits from the acquisition, including tax advantages, are captured by a domestic seller paying capital gains taxes. Tax code issues, such as the treatment of goodwill, are shown to affect the pattern of foreign acquisitions.     

Perspektiven und Optionen einer wachstumsorientierten Finanzpolitik

Nachdem sich die Lage der Staatsfinanzen in den vergangenen Jahren deutlich verbessert hat, wird derzeit kontrovers über den Kurs der Finanzpolitik diskutiert. Soll sie weiterhin vorrangig auf Konsolidierung oder eher auf die vielfach als notwendig erachtete Steigerung des Wachstumspotenzials abzielen? Welche M?glichkeiten für eine verst?rkt wachstumsorientierte Finanzpolitik er?ffnen sich und wie sollten sie genutzt werden? Heinz Gebhardt, 55, Dipl.-Volkswirt, ist wissenschaftlicher Mitarbeiter in den Kompetenzbereichen „Wachstum und Konjunktur“ sowie „?ffentliche Finanzen“ des Rheinisch-Westf?lischen Instituts für Wirtschaftsforschung (RWI) in Essen; Dr. Lars Siemers, 34, ist wissenschaftlicher Mitarbeiter im Kompetenzbereich „?ffentliche Finanzen“ des RWI Essen. Die Autoren danken Roland D?hrn, Rainer Kambeck, Tanja Kasten, Christoph M. Schmidt und Joachim Schmidt für kritische Anmerkungen und hilfreiche Kommentare.