Micro and macroeconomic adjustment processes in East Germany — Ninth report

Micro and macroeconomic adjustment processes in East Germany — Ninth report     

Optimal Portfolios with Bounded Capital at Risk

We consider some continuous-time Markowitz type portfolio problems that consist of maximizing expected terminal wealth under the constraint of an upper bound for the capital at risk. In a Black–Scholes setting we obtain closed-form explicit solutions and compare their form and implications to those of the classical continuous-time mean-variance problem. We also consider more general price processes that allow for larger fluctuations in the returns.     

Der Patient als Partner

Die Patientenedukation schlie?t eine umfassende Information und Beratung des Betroffenen hinsichtlich der verschiedenen Aspekte seiner Erkrankung ein. Gerade bei geriatrischen Patienten mit oft komplexen Krankheitsbildern ist sie oft die Voraussetzung für ein weiteres selbstst?ndiges Leben. Was geh?rt alles dazu?     

Re‐assessing the long‐term underperformance of UK Initial Public Offerings

Previous work has identified that IPOs underperform a market index, and the purpose of this paper is to examine the robustness of this finding. We re‐examine the evidence on the long‐term returns of IPOs in the UK using a new data set of firms over the period 1985–92, in which we compare abnormal performance based on a number of alternative methods including a calendar‐time approach. We find that, using an event‐time framework, there are substantial negative abnormal returns to an IPO after the first 3 years irrespective of the benchmark used. However, over the 5 years after an IPO, abnormal returns exhibit less dramatic underperformance, and the conclusion on negative abnormal returns depends on the benchmark applied. Further if these returns are measured in calendar time, we find that the (statistical) significance of underperformance is even less marked.     

Spatial modelling of claim frequency and claim size in non-life insurance

In this paper, models for claim frequency and average claim size in non-life insurance are considered. Both covariates and spatial random effects are included allowing the modelling of a spatial dependency pattern. We assume a Poisson model for the number of claims, while claim size is modelled using a Gamma distribution. However, in contrast to the usual compound Poisson model, we allow for dependencies between claim size and claim frequency. A fully Bayesian approach is followed, parameters are estimated using Markov Chain Monte Carlo (MCMC). The issue of model comparison is thoroughly addressed. Besides the deviance information criterion and the predictive model choice criterion, we suggest the use of proper scoring rules based on the posterior predictive distribution for comparing models. We give an application to a comprehensive data set from a German car insurance company. The inclusion of spatial effects significantly improves the models for both claim frequency and claim size, and also leads to more accurate predictions of the total claim sizes. Further, we detect significant dependencies between the number of claims and claim size. Both spatial and number of claims effects are interpreted and quantified from an actuarial point of view.     

The Contribution of In‐house and External Design Activities to Product Market Performance

Design may be seen as one of several key factors contributing to new product development, along with research and development, marketing, manufacturing, purchasing, etc. More and more, creative design comes to the fore, and many companies believe that superior design will be the key to winning customers. It has the ability to create corporate distinctiveness and also possesses the potential to give a product an individual or new look. Furthermore, the model of open innovation suggests that firms can and should use external and internal knowledge flows in order to create valuable ideas, and also internal and external paths to the market. Also, in the design process, a common trend toward external design skills has emerged in recent years. Due to cost and control factors, firms are increasingly outsourcing design activities. By using a sample of Belgian companies, this paper explores the contribution of design activities to product market performance. While there is mounting evidence that design can be seen as a strategic tool to successfully spur sales of new product developments at the firm level, the topic of design innovation has not yet been linked to the open innovation concept. In this paper, it is empirically tested whether design activities conducted in house differ in their contribution to new product sales from externally acquired design. So, do design activities that have been developed only with internal resources lead to a greater success than those that have been carried out with external sources of knowledge? Using a large cross‐section of manufacturing and service firms, the effects on sales of products new to the market and of imitations or significantly improved products of the firm are investigated. At first glance, the findings indicate that externally acquired design is not superior to in‐house design activities: the results show that only design activities that are mainly conducted with internal knowledge sources play a crucial role regarding the product innovation's success with market novelties. Design conducted in collaboration with external partners, however, has no significant influence. This is not the case for imitations, that is, products only new to the firm. Their success is also influenced by design activities developed with external collaborators. This effect is robust for several modifications of the model specification. In contrast to earlier literature on new technological developments, this paper argues that external design may not affect the sales of market novelties as the “market news” may spill over quickly to rivals through common suppliers including external designers.     

Local institutions: Regulation and valuation of forest use—Evidence from Central Sulawesi,Indonesia

Forest management poses particular challenges as the pressure on forests is huge due to deforestation. In this context, the establishment of protected areas is a common conservation measure where institutions are put in place and sanctions regarding forest use are enforced. This paper focuses on the practice of sustainable forest management and the associated perspectives of local institutions at the rainforest margins of Lore Lindu National Park (LLNP) in Central Sulawesi, Indonesia.