Similarly , the spread of money economy is often seen as having stimulated the replacement of labor services by money payments , but the growth of the money supply and resulting inflation after 1170 initially led nobles to take back leased estates and to re-impose labor dues as the value of fixed cash payments declined in real terms . Similarly , the spread of money economy stimulated the replacement of labor services by money payments , but the growth of the money supply and resulting inflation after 1170 initially led nobles to take back leased estates and to re-impose labor dues as the value of fixed cash payments declined in real terms .