Introducing a general class of species diversification models for phylogenetic trees

Phylogenetic trees are types of networks that describe the temporal relationship between individuals, species, or other units that are subject to evolutionary diversification. Many phylogenetic trees are constructed from molecular data that is often only available for extant species, and hence they lack all or some of the branches that did not make it into the present. This feature makes inference on the diversification process challenging. For relatively simple diversification models, analytical or numerical methods to compute the likelihood exist, but these do not work for more realistic models in which the likelihood depends on properties of the missing lineages. In this article, we study a general class of species diversification models, and we provide an expectation-maximization framework in combination with a uniform sampling scheme to perform maximum likelihood estimation of the parameters of the diversification process.     

Liberal Thought in Reasoning on CSR

In this article, I argue that conventional reasoning on corporate social responsibility (CSR) is based on the assumption of a liberal market economy in the context of a nation state. I build on the study of Scherer and Palazzo (Acad Manage Rev 32(4):1096–1120, 2007), developing a number of criteria to identify elements of liberal philosophy in the ongoing CSR debate. I discuss their occurrence in the CSR literature in detail and reflect on the implications, taking into account the emerging political reading of the firm. I conclude that the apolitical framework in the mainstream CSR literature has to be overcome since it does not reflect recent changes in the socio-economic conditions for economic actors in a globalizing world.     

Perspektive für junge Pflegebedürftige

Gro?er Bedarf – wenig Angebot – Station?re Intensiv- und Schwerstpflegepl?tze für junge Menschen sind selten zu finden in deutschen Pflegeeinrichtungen. Dabei sind Bedarf und Nachfrage gro?. Das Berliner Sanatorium West hat sich darauf eingestellt und einen Wohnbereich für junge Menschen ab 20 Jahre eingerichtet.     

Saving Rates, Trade, Technology, and Stochastic Dynamics

This paper develops a framework for analyzing the stochastic dynamics of small growing trading economies with CES sector technologies. The open neoclassical two-sector growth model with a diffusion process (uncertainty) for the aggregate saving/investment ratio is demonstrated with sample paths and long-run probability distributions of the overall factor endowment ratio. Stochastic endogenous growth and cycles require a combination of fundamental growth parameter values: saving rates, terms of trade, and sectorial substitution elasticities.     

Aufsicht der deutschen Flughäfen nicht dem Eigentümer überlassen

In Germany federal states are frequently both owners and regulators of commercial airports. This article argues that in order to avoid potential conflicts of interest, the supervision over fees should be handed over to an independent central agency. In addition, the liberalisation of the market for ground handling services should be continued. At large airports with sufficient capacity, additional independent service providers should be licensed to provide services.     

Determinants of customer loyalty and purchasing behavior for full-service and limited-service hotels

This study investigated factors that influence consumer purchasing decisions for two hotel segments: full-service and limited-service. Results from an online survey indicated that full-service hotel guests were more likely to be reward program members and be emotionally attached to their preferred brand. Price was the most important factor for limited-service guests’ purchase decisions, while both price and utility were important for full-service guests. Limited-service guests had lower switching costs, that is, they required less of a discount to switch to a non-preferred brand than full-service guests. The findings have implications for hotel pricing and marketing strategies.