The following period saw the new town expand rapidly in highly favourable economic circumstances. The Birmingham market was the earliest to be established on the Birmingham Plateau – an area which accounted for most of the doubling or tripling of the population of Warwickshire between 1086 and 1348 as population growth nationally encouraged the settlement and cultivation of previously marginal land. Surviving documents record the widespread enclosure of wasteland and clearance of woodland in King's Norton, Yardley, Perry Barr and Erdington during the 13th century, a period over which the cultivated area of the manor of Bordesley also increased twofold. Demand for agricultural trade was further fuelled by the increasing requirement for rents to be paid in cash rather than labour, leading tenant farmers to sell more of their produce. It would be almost a century before markets at Solihull, Halesowen and Sutton Coldfield provided the Birmingham market with any local competition, and by then the success of Birmingham itself provided the model, with tenure at Solihull explicitly being granted "according to the liberties and customs merchant of the market of Birmingham".