When the great proprietors of land spend their rents in maintaining their tenants and retainers, each of them maintains entirely all his own tenants and all his own retainers. But when they spend them in maintaining tradesmen and artificers, they may, all of them taken together, perhaps maintain as great, or, on account of the waste which attends rustic hospitality, a greater number of people than before. Each of them, however, taken singly, contributes often but a very small share to the maintenance of any individual of this greater number. Each tradesman or artificer derives his subsistence from the employment, not of one, but of a hundred or a thousand different customers. Though in some measure obliged to them all, therefore, he is not absolutely dependent upon any one of them.
The personal expense of the great proprietors having in this manner gradually increased, it was impossible that the number of their retainers should not as gradually diminish, till they were at last dismissed altogether. The same cause gradually led them to dismiss the unnecessary part of their tenants. Farms were enlarged, and the occupiers of land, notwithstanding the complaints of depopulation, reduced to the number necessary for cultivating it, according to the imperfect state of cultivation and improvement in those times. By the removal of the unnecessary mouths, and by exacting from the farmer the full value of the farm, a greater surplus, or, what is the same thing, the price of a greater surplus, was obtained for the proprietor, which the merchants and manufacturers soon furnished him with a method of spending upon his own person, in the same manner as he had done the rest. The cause continuing to operate, he was desirous to raise his rents above what his lands, in the actual state of their improvement, could afford. His tenants could agree to this upon one condition only, that they should be secured in their possession for such a term of years as might give them time to recover, with profit, whatever they should lay out in the further improvement of the land. The expensive vanity of the landlord made him willing to accept of this condition; and hence the origin of long leases.