The foundation plates of this volume kept deferring a question. At the close of each — the differential, the margin, the general law of scarcity, the rent that time dissolves — stood the same unanswered asking: whether the surplus to a fixed thing is a thing earned, or merely a thing extracted. This plate stops deferring. It takes up the idea that land rent, or at the least the growth of it, is unearned — the creation not of the owner but of the whole society that rises up around his land — and the remarkable policy that has been drawn from it: that this unearned increment can, and ought to, be taxed away, and taxed, alone among all the levies a state might raise, without cost to anyone but the idle owner himself. The plate follows the idea from Mill's coining of it, through Henry George's vast and half-forgotten crusade, to the surprising verdict of the modern science — that the tax on land may be the best tax there is — and gives the volume's question its sharpest answer yet, while showing why even that answer does not reach all the way to its edge.
Begin with Mill. In 1848 John Stuart Mill set down the observation that would become the whole of this plate's theme: that the landlords, as a society advances, “grow richer, as it were in their sleep, without working, risking, or economizing.” For the rent of land rises as a country grows — as its people multiply, its commerce thickens, its roads and railways and cities spread across the map — and that rise owes nothing whatever to the landowner, who has done no more than hold his title while the world improved around it. Mill named this rise the unearned increment: the increase in the value of land created by the growth of the community, and by no act of the owner's. And he drew the conclusion that follows. If the increment is the creation of society, then society has a just claim upon it; and Mill proposed that the future rise in land values — not the value that stood already, which the present owners had fairly bought and paid for, but the increment yet to come — be taken, by taxation, for the common good. The owner might keep what he had purchased; but the windfall that the nation's growth would heap upon him, the nation might in justice reclaim.
But it was an American, Henry George, who took Mill's quiet observation and made of it a crusade that shook the world. George began from a paradox the age pressed hard upon him: why, amid the most stupendous material progress the world had ever witnessed — the railroads, the factories, the wealth pouring from the new machines — did poverty not vanish but seem to deepen, the squalor of the great cities swelling alongside their riches? His answer, set out in Progress and Poverty in 1879, in prose that sold in the millions and was read around the globe, was that the gains of all this progress were being swallowed by the rent of land. As society advanced, the value of land rose faster than all else; and the landowners, who produced nothing, gathered in the advancing fruits of everyone's labour and everyone's enterprise as rent, while wages and the return to capital were squeezed against the rising claim of the ground beneath. Progress itself, George argued, by lifting the value of land, delivered its own gains into the hands of those who merely owned the earth — and that, and not any failure of productivity, was why plenty and poverty advanced together, locked arm in arm.
Progress itself, by lifting the value of the land, delivers its own gains into the hands of those who merely own the earth.
From the diagnosis flowed a cure as radical as itself. If rent is the unearned capture of society's progress, George reasoned, then let society take it back — and take it back in a manner that would free the economy rather than burden it. He proposed to abolish every other tax — every tax upon labour, upon trade, upon the fruits of industry and enterprise, all of which punish the very activity they fall upon — and to put in the place of the whole apparatus a single tax upon the value of land. Not upon the buildings, nor the crops, nor any improvement the owner had wrought — those were the products of effort, and to tax them was to tax production itself — but upon the value of the bare site, the location alone, which the community and never the owner had made worth having. The single tax would fall upon the unearned, and upon the unearned only; it would return to society the value that society had made; and it would, George promised, suffice to fund the whole of government, drain the poverty from the cities, and leave every productive act untaxed and free. It was, for a season, one of the most powerful political ideas in the English-speaking world; its author came within a few thousand votes of the mayoralty of New York.
And here the crusader's vision met, and was confirmed by, the cold logic of the foundation this volume has laid. For there is a reason beyond justice that the tax on land is special — a reason the earlier plates make plain. Recall that rent is the surplus to a fixed factor, the lesson of the scarcity; and that to tax that surplus does not disturb the margin which sets the price, the lesson of the marginal land. It follows that a tax upon the value of land is unique among all taxes in working no distortion whatever. Tax labour, and men work a little less; tax capital, and men invest a little less; tax trade, and trade contracts — every ordinary tax, by falling upon something whose supply can answer, discourages the very thing it touches, and leaves the economy poorer by more than the revenue it raises, in that dead loss the economists call the burden of taxation. But land cannot answer. Its supply is fixed; one cannot make less of it to escape the tax; and so a tax upon its value falls wholly upon the owner's rent, altering nothing he does, withdrawing not a single acre from use, leaving not a particle of dead loss behind. The tax on land is the one tax that takes without discouraging — and so, on the cold ground of efficiency alone, quite apart from George's burning sense of justice, the modern science has granted the greater part of his central claim: that a tax on land value is the least harmful, and very possibly the best, of all the taxes a state can lay. Even economists with not a shred of sympathy for his politics have called it so.
The tax on land is the one tax that takes without discouraging — and so, alone among taxes, leaves not a particle of dead loss behind.
And yet — the question that haunts every admirer of the idea — if the tax on land is so just and so efficient, why has the world so seldom laid it? The answers are partly objections of principle and partly the resistance of power, and an honest plate must weigh them all. There is, first, the problem of assessment: to tax the bare site and spare the improvements, one must somehow value the site apart from everything built upon it — and to disentangle the worth of the location from the worth of the edifice, the unearned ground from the earned building, is a genuinely hard and contestable business, though not, the modern valuers insist, an impossible one. There is, second, the question of sufficiency: whether the rent of land, a smaller share of a modern industrial economy than of George's agrarian one, could truly fund the whole of a modern state — so that the “single” tax may need, after all, to be one tax among several. There is, third, the hard matter of fairness to those who hold land now: for most of them bought it at a price that already reflected its expected rents, and a full tax suddenly imposed would crash that value and ruin them — the ordinary householder and the pension fund beside the speculator — which is exactly why Mill, the more cautious man, would have taxed only the increment still to come. And beneath all these runs the plain resistance of those who own the land, who have always been numerous among the powerful, and who have never been eager to tax themselves. The tax on land is easy to justify and hard to install; and most of the places that have tried it have done so by halves, taxing the value of the site at a higher rate than the buildings rather than taxing it alone.
One scruple remains, and it is the volume's own. The whole case rests upon the word unearned — upon the claim that the value of land is the creation of society and not of its owner. And that claim, true in the main, is not true without remainder. For some of what a landowner takes is not the unearned increment at all: it is the return upon the improvements he has genuinely made, the draining and the building and the tending that the single tax was at pains to exempt; and it is, less obviously, the reward for having borne a risk — for having bought the land that might have risen and might as easily have fallen, and so having carried the uncertainty that the speculator carries, which is not nothing. Even the bare site value is not quite purely unearned, for the price of land does a necessary work, as the earlier plates allowed: it rations the scarce locations to the uses that value them most, and a price that does that work is not wholly idle. So the “unearned” of this plate is, like every sharp word in this volume, a little softer on inspection than at first it shows — land rent is largely the capture of a value the owner did not make, more largely so, it may be, than any other return in the whole economy, but “largely” is not “wholly,” and the remainder is the ground on which the honest argument is still fought.
Return, then, a last time in the volume's first half, to its question. The unearned increment is the sharpest answer the volume has yet yielded to its own asking: of all the rents these plates examine, the rent of land — and above all the increment of it that springs from the mere growth of the community — is the one most plainly extracted rather than earned, the value society creates and the owner merely gathers while he sleeps. Mill saw it, and would have taxed the increment; George saw it, and would have taxed the whole and freed the rest of the economy entire; and the modern science, weighing it on the cold scale of efficiency, has granted the larger part of their case — that the tax on land is the one tax that takes without discouraging, and land rent the one great income a society may reclaim without loss. And yet even here, at the volume's sharpest point, the answer will not run all the way to its edge: for the assessment is hard, the sufficiency uncertain, the transition cruel to the innocent holder, and the “unearned” itself not quite total, shadowed always by the improvement and the risk and the rationing work that even the idlest-seeming rent performs. The unearned increment is the strongest case the volume can make for calling rent extraction — and the proof that even the strongest case is bounded. Whether to reclaim it, and how much, and by what means, is a question that passes out of this volume and into the volume of the tax, and there goes on. As the table says of every price within it, the argument remains open.