The post-crisis European economy is characterised by slow rates of growth. The consequences of the Great Recession which followed the collapse of the investment bank Lehman Brothers, determined that, on the 15th of September 2008, all the actors of the global economic scene assess the symptoms,...

Die Mehrwertsteuer (Umsatzsteuer) ist die Steuer mit dem größten Steueraufkommen. Für sie gibt es noch keinen Steuerfreibetrag. Ein "Mehrwertsteuerfreibetrag" ließe sich auf dem Wege einer "Negativen Mehrwertsteuer" realisieren. Diese orientiert sich an dem Konzept der "Negativen...

In this thesis, we develop a SKU level market basket model and apply the model to investigate cross-category reference price effects. This research extends previous work on the category-level multivariate logit model (Russell and Petersen 2000). Our model is a generalization of the multivariate...

The thesis consists of four separate papers that can be read individually.In the first paper “Efficiency of the Polish Banking Industry: Foreignversus Domestic Banks” we analyze the efficiency of foreign and domesticbanks. The second paper entitled “Foreign Acquisitions and Industry...

A single outlier in a regression model can be detected by the effect of its deletion on the residual sum of squares. An equivalent procedure is the simple intervention in which an extra parameter is added for the mean of the observation in question. Similarly, for unobserved components or...