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All Individuals are enriched at the Expense of the Proprietors of Land

It is simple enough to observe that all the necessities and conveniences of life are taken from the land: if every landowner refused to open his fields to cultivation, there could be no food for anyone. All labor must be performed upon something - either the land itself or the produce of the land.

There is some elaboration on how land is apportioned:

Those who live in cities come to live better than their country brethren by virtue of profiting from the income of the landlords and nobility, each of whom own a great deal of land and take a third of all product of all the land, to be traded for goods. In essence, a third of the land's product is consumed in the country and two-thirds in cities, among a roughly equal number of people.

It has been said that labor without land produces nothing, but it is equally true that land without labor produces nothing - hence the relationship between the owner of land and the provided or labor is mutually beneficial.