Economics is a social science that combines politics and science. It focuses on how people choose to live their lives and interact with each other. Economics uses scientific methods to address political questions and tackle societal challenges. The author was inspired to write a book to share the excitement of economics and its unique perspective on the world. They believe that studying economics is essential for everyone to become better citizens. By writing an economics textbook, economists can contribute to better governance and a more prosperous future, as famously stated by economist Paul Samuelson.