These enclosures were not caused by an advance in the price of wool relatively to that of wheat, as the rise in the price of wool in the decade 1510-1520 was no greater than that of corn. Nor does sheep farming seem to have been especially profitable at this time, as More himself attributes the high price of wool in part to a "pestiferous morrein." Again, the complaint is also made that unemployment was caused, showing that scarcity of labor was not the reason for the conversion of arable to pasture: The husbandmen be thrust owte of their owne, ... whom no man wyl set a worke, though thei never so willyngly profre themselves therto. For one Shephearde or Heardman is ynoughe to eate up that grounde with cattel, to the occupiyng wherof aboute husbandrye manye handes were requisite.[21] In 1514 a new husbandry statute was passed, penalising the conversion of tillage to pasture, and requiring the restoration of the land to tillage. It was repeated and made perpetual in the following year. In 1517 a commission was ordered to enquire into the destruction of houses since 1488 and the conversion of arable to pasture. In 1518 a fresh commission was issued and the prosecution of offenders was begun. These facts are cited as a further reminder of the fact that the period for which the prices of wool and wheat are both known is the critical period in the enclosure movement. It is the enclosures covered by these acts and those referred to by Sir Thomas More which historians have explained by alleging that the price of wool was high. As a matter of record, the course of prices was such as to encourage the extension of tillage rather than of pasture.