A picture of Max Weber as an economist is given, mainly by focusing on a text which he distributed to his students when he taught economics in the 1890s. Weber's work in economic sociology is outlined, relying primarily on Economy and Society and its central Chapter 2 (Sociological Categories of Economic Action). The differences between the approaches of economic theory and economic sociology, as seen by Weber, are summarized, and an account is given of some of Weber's most suggestive concepts in economic sociology. The question is raised as to when the analyst, according to Weber, should use economic sociology rather than economic theory, and vice versa. Weber's ideas about a broad economic science are also presented.