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Wir befinden uns heute in der vollen Entfaltung des modernen Fremdenverkehrs. Dies nach seiner klassischen Periode vor 1914 und der Periode des Überganges bis ca. 1954. Nachstehend soll vom modernen Fremdenverkehr in seiner Gesamtheit und einigen aus seinem Fortschritt sich ergebenden Entwicklungstendenzen die Rede sein. Dies geschieht in Form eines summarischen, sozusagen im Telegrammstil gehaltenen Abrisses.

Without controlling for selection bias and the potential endogeneity of the treatment by using proper methods, the estimation of treatment effect could lead to biased or incorrect conclusions. However, these issues are not addressed adequately and properly in higher education research. This study reviews the essence of self-selection bias, treatment assignment endogeneity, and treatment effect estimation. We introduce three treatment effect estimators – propensity score matching analysis, doubly robust estimation (augmented inverse probability weighted approach), and endogenous treatment estimator (control-function approach) – and examine literature that applies these methods to research in higher education. We then use the three methods in a case study that estimates the effects of transfer student pre-enrollment debt on persistence and first year grades. The final discussion provides guidelines and recommendations for causal inference research studies that use such quasi-experimental methods.

This paper aims to raise awareness and the level of debate on a significant new development in international law.

The paper takes a historical overview in considering current approaches to the phenomenon of private military corporations (PMCs) and uses case examples to discuss the issues raised.

The paper concludes that the phenomenon raises many issues that need further analysis, such as the outcome of this phenomenon on the future of democracy in sovereign states.

The topic allows for much further research into such matters as definitional, jurisdictional and enforceability issues with regard to corporate entities known as PMCs.

For peace and human rights to prevail in democracies in which the state maintains the monopoly on the use of force, the paper argues that PMCs should be prohibited rather than subjected to mere regulation.

The paper is the first to use the term “preyfits” in describing the actions of transnational corporations. While most scholars argue for regulation of PMCs, this paper argues for their total prohibition.