This book presents and discusses the most common mistakes in economics made by a vast majority of people in every aspect of society. Discussed herein are common misconceptions on economic issues, including such perennial issues like 'technical progress destroys jobs', 'immigration harms the domestic economy', 'population growth is undesirable', 'globalisation is bad'. Such misconceptions by a significant section of the general public do not just reflect inadequate understanding of how the economy functions, but may actually lead to unnecessary conflicts and impede progress and liberalisation. Understanding our mistakes on these issues may thus contribute to the advancement of our society and the progress towards a more harmonious world.