The essays collected here straddle four decades of work in both historiography and Marxist theory, combining source-based historical work in a wide range of languages with sophisticated discussion of Marx's categories. Key themes include the distinctions that are crucial to restoring complexity to the Marxist notion of a 'mode of production'; the emergence of medieval relations of production; the origins of capitalism; the dichotomy between free and unfree labour; and essays in agrarian history that range widely from Byzantine Egypt to 19th-century colonialism.