The third volume of the series presents contributions to the proceedings of the 12th and 13th annual conference of the Faculty of Economics and Business Administration at Sofia University. The fourteen articles by authors of six nations (Bulgaria, China, Germany, Italy, Russia, and Switzerland) have been selected by international peer reviews. The contributions are arranged in the sections theoretic approaches, empirical studies on European countries and contributions to sustainable development in theory and application. The volume contains 33 graphs, 20 tables and three drawings.