The Feudal Origins of Manorial Prosperity: Social Interactions in Eleventh-Century England

Does the prosperity of medieval manors depend on their position in the feudal system? How large are these effects? And what are the underlying economic mechanisms? Using Domesday Book, a unique country-wide survey conducted by William the Conqueror, we reinterpret the eleventh-century English feudal system as a network in which manors are linked to one another based on their common ownership structure. Both a reduced-form and a more structural approach reveal the existence of external economies of scale: manorial prosperity was closely intertwined with the fortune of feudal peers. Our findings quantitatively establish the existence of feudal coordination in High-Medieval agricultural activities, revealing how institutionalized interactions could serve to mitigate transaction costs.