Stromspeicher für die „Energiewende“ – eine akteursbasierte Analyse der zusätzlichen Speicherkosten

Political targets for implementing the German “energy turnaround” aiming at the ambitious extension of renewable energies to generate electricity. However, a majority of the renewable supply is provided by intermittent sources, e.g. wind and solar power. For balancing the increasing supply fluctuations additional storage options are claimed beside of an enforced grid infrastructure and a more flexible demand side. Despite of the political guidelines the economics of additional flexibility measures has to be considered. For this paper we analyse the costs of large scale stationary battery storages to be operated in wholesale markets and transmission grid level. By deriving a key figure based on a life-cycle cost approach, we are able to evaluate the additional costs of electricity of selected battery technologies (lead-acid, lithium ion, sodium sulphur, redox-flow). Moreover, current and valid parameters of the cost analysis are received by scientific and industrial stakeholders of battery systems via online survey and face-to-face interviews. According to the stakeholder estimation a nationwide operation of stationary battery storages will be established at wholesale and transmission grid level until the year 2030. The life-cycle cost analysis, which also includes estimated future cost reductions, shows that lead-acid batteries remain the cost-efficient technology, assuming about 100 storage cycles p.a. In addition, a sensitivity analysis reveals the impact of increasing annual storage cycles as well as the achievable cost reduction by economies-of-scales of the power unit of the storage system.     

Lodging Managers' Perceptions of Work and Personal Life: Balanced or Imbalanced?

ABSTRACT

This study serves two main purposes: (1) to assess lodging managers' perceptions of difficulties and success in balancing their personal and work lives, and (2) to investigate if lodging managers' work interferes with or is enhanced by their personal lives, or vice versa. The results indicate that most lodging managers believe that they have struck a satisfactory balance between their work and personal lives. This study identifies the respective bidirectional effects of the interaction between work and personal life. Personal life boundaries are more permeable to work demands than work boundaries are to personal life demands.     

Hedging Equity-Linked Life Insurance Contracts

Abstract

This paper examines a portfolio of equity-linked life insurance contracts and determines risk-minimizing hedging strategies within a discrete-time setup. As a principal example, I consider the Cox-Ross-Rubinstein model and an equity-linked pure endowment contract under which the policyholder receives max(S_T , K) at time T if he or she is then alive, where S_T is the value of a stock index at the term T of the contract and K is a guarantee stipulated by the contract. In contrast to most of the existing literature, I view the contracts as contingent claims in an incomplete model and discuss the problem of choosing an optimality criterion for hedging strategies. The subsequent analysis leads to a comparison of the risk (measured by the variance of the insurer’s loss) inherent in equity-linked contracts in the two situations where the insurer applies the risk-minimizing strategy and the insurer does not hedge. The paper includes numerical results that can be used to quantify the effect of hedging and describe how this effect varies with the size of the insurance portfolio and assumptions concerning the mortality.     

The international co-movements of Finish stocks

This paper provides new empirical evidence on the international co-movements of Finnish stocks. The vector autoregression (VAR) approach indicates that US and especially Swedish stock markets lead Finnish stock market returns by approximately one or two months. The results based on international market models indicate that the returns of individual Finnish stocks are significantly positively related to those of Sweden, while the relation between Finnish and US returns is significantly lower. The relation seems to vary clearly between industries, some industries being related to US markets as well. Significant time-series instability is reported in the results, however.     

Corporate diversification and firm value: a survey of recent literature

We survey the recent literature on corporate diversification. How does corporate diversification influence firm value? Does it create or destroy value? Until the beginning of this century, the predominant thinking among researchers and practitioners was that corporate diversification leads to an average discount on firm value; however, several studies cast doubt on the diversification discount. In the last decade, there has been no clear consensus as to whether there is a discount or even a premium on firm value. Recent literature concludes that the effect on value differs from firm to firm and that corporate diversification alone does not drive the discount or premium; rather, the effect is heterogeneous across certain industry settings, economic conditions, and governance structures.     

Capital Market Development,Competition, Property Rights,and the Value of Insurer Product‐Line Diversification: A Cross‐Country Analysis

In this article, we show that the effect of product diversification on performance is not homogeneous across countries. Diversified insurance companies perform significantly worse than their focused competitors in countries with well‐developed capital markets, high levels of property rights protection, and high levels of competition. In addition, we find that the diversification–performance relationship for insurance companies depends on company size. For large insurers operating in countries with less developed capital markets, diversification significantly increases performance. Our results suggest that the optimal organizational structure may be different for insurers operating in emerging economies than for insurers operating in developed countries.     

Captives zur Absicherung von Extremrisiken? Eine Untersuchung am Beispiel der OIL Insurance Limited

The use of captive insurance companies (captives) is quite common among big and international companies. Generally, captives are used to insure against high frequency/low severity risks. However, we can find captives which have been founded to deal with extreme risks as well. An example is the OIL Insurance Limited (OIL Insurance). In this context, we examine from a theoretical perspective whether captives are suitable for insurance against catastrophe risks. We show that regarding actuarial aspects captives have advantages in comparison to internal self-insurance and disadvantages in comparison to external insurance. The foundation of industry captives through the association of several companies can solve some of the problems, but further criteria especially costs have to be considered. Based on the developed arguments, we analyse whether our case example OIL Insurance is an appropriate instrument to transfer extreme risks.     

Does it pay to have friends? Social ties and executive appointments in banking

We exploit a unique sample to analyze how homophily (affinity for similar others) and social ties affect career outcomes in banking. We test if these factors increase the probability that the appointee to an executive board is an outsider without previous employment at the bank compared to being an insider. Homophily based on age and gender increase the chances of the outsider appointments. Similar educational backgrounds, in contrast, reduce the chance that the appointee is an outsider. Greater social ties also increase the probability of an outside appointment. Results from a duration model show that larger age differences shorten tenure significantly, whereas gender similarities barely affect tenure. Differences in educational backgrounds affect tenure differently across the banking sectors. Maintaining more contacts to the executive board reduces tenure. We also find weak evidence that social ties are associated with reduced profitability, consistent with cronyism in banking.     

Analyst coverage,earnings management and financial development: An international study

Using data from 21 countries, this paper analyzes the relation among analyst coverage, earnings management and financial development in an international context. We document that the effectiveness of financial analysts as monitors increases with a country’s financial development (FD). We find that in high-FD countries, increased within-firm analyst coverage results in less earnings management. Such is not the case in low-FD countries. Our results are economically significant and robust to reverse causality checks. Our findings illustrate one mechanism through which financial development mitigates the cost of monitoring firms and curbs earnings management.     

Individual investor perceptions and behavior during the financial crisis

Combining monthly survey data with matching trading records, we examine how individual investor perceptions change and drive trading and risk-taking behavior during the 2008–2009 financial crisis. We find that investor perceptions fluctuate significantly during the crisis, with risk tolerance and risk perceptions being less volatile than return expectations. During the worst months of the crisis, investors’ return expectations and risk tolerance decrease, while their risk perceptions increase. Towards the end of the crisis, investor perceptions recover. We document substantial swings in trading and risk-taking behavior that are driven by changes in investor perceptions. Overall, individual investors continue to trade actively and do not de-risk their investment portfolios during the crisis.