The peculiar trait which distinguishes 'molland' is the transition from labour service to money rent, and the rent is undoubtedly considered as an equivalent for the right to labour services which the lord abandons. It must be admitted that in some cases the lord may have taken less than the real equivalent in order to get such a convenient commodity as money, or because for some reason or another he was in need of current coin. Still I am not afraid to say that, in a general way, commutation supposes an exchange against an equivalent. Indeed the demand for money rents was considered rather as increasing than as decreasing the burden incumbent on the peasantry[749]. Now, although it would be preposterous to try and make out in every single case whether the rent of the free virgate is an adequate equivalent for villain services or not, there is a very sufficient number of instances in which a rough reckoning may be made without fear of going much astray[750]. And if we attempt such a reckoning we shall be struck by the number of cases in which the rent of the free virgate falls considerably short of what it yielded by the virgate of the villain. We have seen that in Ravenston, Bedfordshire, the villain service is valued at eight shillings per virgate, and that the free assessment amounts only to four shillings. In Thriplow, Cambridgeshire, the villains perform labour duties valued at 9_s._ 4_d._ per bovate, the freeholders are assessed variously; but there is a certain number among them which forms, as it were, the stock of that class, and their average rent is 5_s._ 6_d._ per bovate[751]. In Tyringham, Buckinghamshire, the villain holding is computed at six acres and one rood, and its service at five shillings; the free virgates have a like number of acres and pay various rents, but almost without exception less than the villains[752]. In Croxton, Cambridgeshire, there are customers with twenty acres, and others with ten acres; the first have to pay ten shillings and to assist at four boonworks. The free holders are possessed of plots of irregular size, and their rent is also irregular; but on the average much lower than that of the customers[753]. Let it be noted that the customary tenants have commuted their labour services into money payments, and, in fact, they are to be considered as molmen in the first stage of development. Still, their payments are computed on a different scale from those of the free.