The book's theme is the fundamental competitive strategies of companies aimed at cost leadership and product differentiation. This includes sales and pricing strategies, as well as innovation, R&D, product, location, advertising, and standardization strategies. These strategies are examined individually using game-theoretical concepts within the framework of simple models of oligopolistic competition. In addition to the strategic interaction in actual competition, the potential competition and the question of strategic market entry barriers are also of interest. At the end of each chapter, there are corporate policy conclusions, learning control tasks, and literature references. The book can be used in higher education as well as in continuing education.