Scholars of international political economy (IPE) often locate the origins of their field in the contested nature of the world economy of the early 1970s, but many of its early proponents drew important inspiration from political economists who had an international focus from the pre-1945 period. This chapter summarizes the book’s analysis of the field’s pre-1945 roots, an analysis that challenges conventional depictions of this history in two ways. First, the book embraces a more global conception of the field’s pre-1945 roots by highlighting many contributions made by thinkers from outside Europe and the United States. Second, it shows that discussions of the international dimensions of political economy before 1945 involved much more than a debate between the three perspectives of economic liberalism, neomercantilism, and Marxism. This introductory chapter also highlights some limitations of the analysis as well as some of the motivations behind the project.