Through the last couple of decades, scholars on both sides of the Atlantic have increasingly emphasized the importance of political ideas in understanding processes of change and stability in politics and public policy. Yet, surprisingly, relatively little has been done to more clearly and stringently conceptualize the relationship between political power and the role of ideas in public policy and political development. This volume addresses this major lacuna in the policy and political studies literature by bringing some of best scholars in the field, who each write about the relationship between ideas and power in politics and public policy. The contributions frame the concept of ideational power and explore ways in which ideas shape power relations, across a number of distinct countries and policy areas. The topics covered include austerity, coalition building, monetary policy, social policy, tax policy, and macroeconomic indicators. The volume features a short introduction written by the co-editors, and a final, recapitulative essay prepared by Mark Blyth, one of the most cited scholars in the field. This book was previously published as a special issue of the Journal of European Public Policy.