Arnold, 1963), 138 [English]) The figures are derived from the work of W.H.Beveridge on the estates of the bishop of Winchester, as used by M.M.Postan in his article, “Some Economic Evidence of Declining Population in the Later Middle Ages”, Econ. Hist. Rev., 2nd ser., vol. 2 (1950), 221-46. Professor Slicher van Bath has expressed the wages and wheat prices in grams of silver, since the silver content of the coinage was several times debased through devaluation.