In Chapter 3, I address religion as a moral foundation for capitalism by discussing the lives and writings of Max Weber and R. H. Tawney. Classical economists after J. S. Mill limited the motivations of economic man to narrow self-interest and increased the mathematical formalism of their discipline, which tied their hands in arguing for capitalism. I begin by discussing the narrowing of arguments for capitalism in the nineteenth century by classical economists and the resistance to this narrowing by historical economists in Germany. Next, I discuss Max Weber and his broad critique of capitalism which included important social and moral issues as well as economic considerations. Given their opposing views, I contrast Weber’s critique of capitalism with that of Karl Marx. I then discuss the British economist R. H. Tawney and his critique of capitalism as a devout Christian on the political left. Tawney’s attempts to address the social injustices of the British industrial revolution led him to support the British Labour Party, but he rejected Marx’s anti-religious views and his emphasis on class division. This sets up a discussion of the role of religion in the development of capitalism based on Weber and Tawney’s two seminal works.