The role of peasants as participants in markets and as distinctive players in the medieval English economy has been emphasised by a number of historians. Marxist historians writing either side of the Second World War argued for a peasant economy that was, in its development, principally influenced by lordship and which was certainly not determined in the greater part by the market or commerce. The chapter sets out the ways in which the market has often tended to be set aside in discussion of the medieval peasant. It examines the adoption of new approaches to the study of the medieval English economy. Central features of this approach are: an awareness of the potentially significant impact of peasant economic endeavour on medieval gross domestic product and a reconsideration of the role of commerce, including rural trade and peasant economic activity, in effecting and indeed driving change in the medieval English economy.