In "The Power of Productivity," William W. Lewis confronts the enduring chasm between the world’s affluent and impoverished with a resolute clarity that challenges conventional wisdom. Drawing from the extensive, data-driven research conducted by the McKinsey Global Institute across thirteen countries over twelve years, Lewis debunks the long-held belief that financial injections and enhancements in education or government stability alone can uplift the economically disadvantaged nations. Through rigorous analysis, from scrutinizing state-of-the-art factories to the humble street vendors and small businesses, Lewis argues that the real catalyst for economic improvement lies in bolstering productivity. This book not only questions the efficacy of traditional aid but boldly highlights a path forward through the promotion of intense, fair competition and the safeguarding of consumer rights. At the heart of "The Power of Productivity" is a compelling argument for a paradigm shift from a producer-centric to a consumer-focused approach in developing economies. By advocating for policies that prioritize consumer interests and rights, Lewis posits that such a shift is crucial in dismantling the privileges of producers and, in turn, sparking significant economic growth. The narrative is enriched by Lewis’s own insights from his tenure at the McKinsey Global Institute, offering a unique blend of academic research and practical policy recommendations. This book is not just an analysis of economic disparities but an impassioned call to action, aiming to reshape how we think about aiding the world's poor and, ultimately, to create a more stable, prosperous global economy.