To put the matter in a form in which it can be easily understood, let us take two cases. The one, a country where the available land is all in use, and the competition of tenants has carried rents to a point at which the tenant pays the landlord all he can possibly earn save just enough to barely live. The other, a country where all the available land is not in use and the rent that the landlord can get from the tenant is limited by the terms on which the tenant can get access to unused land. How, in either case, if the tax were imposed upon Land Values (or rent), could the landlord compel the tenant to pay it? ...

Hence a tax on Land Values, instead of enabling the holder of land to charge that much more for his land, gives him no power to charge an additional penny. On the contrary, by making it more costly to hold land idle, it tends to increase the amount of land which owners must strive to secure tenants or purchasers for. Thus the effect of a tax on Land Values is not to increase the rent that the tenant must pay the owner for the use of the land, but rather to reduce it. And since the tax must be paid out of what the land will yield the owner, its effect would be to reduce the price for which the land could be sold outright.  ... read the whole article

Charles B. Fillebrown: A Catechism of Natural Taxation, from Principles of Natural Taxation (1917)

Q55. How would the single tax effect the tenant?
A. It would neither increase nor decrease his land rent. It would reduce his house rent by the amount of the house tax.

... read the whole article

Upton Sinclair: The Consequences of Land Speculation are Tenantry and Debt on the Farms, and Slums and Luxury in the Cities

I know of a woman — I have never had the pleasure of making her acquaintance, because she lives in a lunatic asylum, which does not happen to be on my visiting list. This woman has been mentally incompetent from birth. She is well taken care of, because her father left her when he died the income of a large farm on the outskirts of a city. The city has since grown and the land is now worth, at conservative estimate, about twenty million dollars. It is covered with office buildings, and the greater part of the income, which cannot be spent by the woman, is piling up at compound interest. The woman enjoys good health, so she may be worth a hundred million dollars before she dies.

I choose this case because it is one about which there can be no disputing; this woman has never been able to do anything to earn that twenty million dollars. And if a visitor from Mars should come down to study the situation, which would he think was most insane, the unfortunate woman, or the society which compels thousands of people to wear themselves to death in order to pay her the income of twenty million dollars?

The fact that this woman is insane makes it easy to see that she is not entitled to the "unearned increment" of the land she owns. But how about all the other people who have bought up and are holding for speculation the most desirable land? The value of this land increases, not because of anything these owners do — not because of any useful service they render to the community — but purely because the community as a whole is crowding into that neighborhood and must have use of the land.

The speculator who bought this land thinks that he deserves the increase, because he guessed the fact that the city was going to grow that way. But it seems clear enough that his skill in guessing which way the community was going to grow, however useful that skill may be to himself, is not in any way useful to the community. The man may have planted trees, or built roads, and put in sidewalks and sewers; all that is useful work, and for that he should be paid. But should he be paid for guessing what the rest of us were going to need?

Before you answer, consider the consequences of this guessing game. The consequences of land speculation are tenantry and debt on the farms, and slums and luxury in the cities. A great part of the necessary land is held out of use, and so the value of all land continually increases, until the poor man can no longer own a home. The value of farm land also increases; so year by year more independent farmers are dispossessed, because they cannot pay interest on their mortgages. So the land becomes a place of serfdom, that land described by the poet, "where wealth accumulates and men decay." The great cities fill up with festering slums, and a small class of idle parasites are provided with enormous fortunes, which they do not have to earn, and which they cannot intelligently spend.

This condition wrecked every empire in the history of mankind, and it is wrecking modern civilization. One of the first to perceive this was Henry George, and he worked out the program known as the Single Tax. Let society as a whole take the full rental value of land, so that no one would any longer be able to hold land out of use. So the value of land would decrease, and everyone could have land, and the community would have a great income to be spent for social ends. ...

In Philadelphia, as in all our great cities, are enormously wealthy families, living on hereditary incomes derived from crowded slums. Here and there among these rich men is one who realizes that he has not earned what he is consuming, and that it has not brought him happiness, and is bringing still less to his children. Such men are casting about for ways to invest their money without breeding idleness and parasitism. Some of them might be grateful to learn about this enclave plan, and to visit the lovely village of Arden, and see what its people are doing to make possible a peaceful and joyous life, even in this land of bootleggers and jazz orchestras. ... read the whole article

Mason Gaffney: The Red and the Blue