The second structural restraint to the accumulation of private property is the labour limitation. The actual amount of energy and production of human labourjustifiestheappropriationof the fruits of nature.Beyondacertainpoint,however, that accumulation becomes unnatural and immoral. The individual has a right to any property acquired but with the provision: ‘As much land as a man tills, plants, improves, cultivates, and can use the product of, so much is his property. He by his labour does, as it were, enclose it from the common’.