In 'Major Transformations,' Mark Blyth meticulously unpacks the intricate relationship between prevailing economic ideas and profound institutional changes throughout the twentieth century. This insightful analysis challenges the notion that economic shifts are purely rational responses to market forces, arguing instead that they are deeply rooted in specific intellectual frameworks and political struggles. Blyth explores how dominant economic paradigms, from Keynesianism to neoliberalism, shaped policy choices and reshaped global institutions, offering a compelling narrative on the contingent and often contested nature of economic evolution. The book provides a critical lens through which to understand the historical trajectory of modern economies and the powerful, yet often overlooked, role of ideational forces.