Werner Sombart, seen both as a path-breaking innovative economic historian who invented the concept of the Spätkapitalismus (Late Capitalism) and the follower (for some time) of Hitler’s National Socialism, is still a forgotten major figure in German social science. As the author of a widely known exposition on socialism and social movements (trade unions), the monumental Der moderne Kapitalismus and a controversial monograph on the role of the Jews in the birth of capitalism, he is shown in this book in the broader context of the disputes in the first decades of the 20th century involving Marxists, German Jews and his friend Max Weber.