This textbook provides a comprehensive overview of macroeconomic relationships and explains the most important macroeconomic variables in a clear and accessible way. Readers are introduced to key concepts such as inflation and aggregate demand. They learn, among other things, how economic crises arise and how money, capital, and goods markets function and interact. The book complements business administration studies and provides economic knowledge that can be applied in business practice. Detailed explanations, application-oriented and practice-based examples, as well as exercises, make it easy even for non-economists to understand complex macroeconomic topics. The third edition has been revised and expanded to include current topics such as the COVID-19 crisis and a new chapter on the development of macroeconomics.