To study contemporary capitalism, I argue, sociology must go back before the disciplinary division of labour with economics negotiated on its behalf by its twentieth century founding figure, Talcott Parsons. For this it will be helpful to rediscover the sociology in classical economists from Smith to Pareto, Marshall, Keynes and Schumpeter, and the economics in classical sociologists like Weber, Sombart, Mauss and Veblen, to name only a few. Particular interest might usefully be paid to the institutional economics of the Historische Schule and to Marx the social theorist, as opposed to the deterministic economist. The lesson to be learned from all of them is that capitalism denotes both an economy and a society, and that studying it requires a conceptual framework that does not separate the one from the other.