This volume turns from the price of work to the price of position — the rent of land, and of every scarce spot that others must pass through to live or to trade. And it begins where the theory of rent itself began, with David Ricardo, who in 1817 handed economics one of its most elegant ideas and one of its most subversive: that rent is not a payment for anything the landlord does, but a differential — the plain advantage of the better land over the worse — and that, so far from raising the price of what the land brings forth, it is the high price that brings forth the rent. The plate sets out Ricardo's differential, which is the foundation of everything the rest of this volume will build upon; and through it, the question the whole volume exists to press: whether the return to owning a scarce position is a thing earned, or a thing merely extracted from those who must use it.
Begin with Ricardo's picture, which is almost geometrical in its clarity. Land differs in its quality; the best is brought under the plough first, the next-best after, and so down the scale. As a growing people needs more corn than the best land alone can yield, worse and worse land is taken into cultivation. Now fix the eye on the worst land in use — the marginal land, the last and poorest plot whose crop is just sufficient to repay the labour and the capital spent upon it, with nothing whatever left over. That plot pays no rent, and can pay none, for there is no surplus on it from which a rent might be drawn; a landlord who demanded one would simply see it go untilled. But every better plot, worked at the very same outlay, yields more than the marginal plot — and that excess, the difference between what the good land returns and what the marginal land returns, is rent. Rent is the differential: the surplus of the better land over the worst land in use, gathered in by whoever holds the title to the better.
And here Ricardo turned the common understanding clean upon its head, in a sentence that has rung down two centuries. The plain man supposed that corn was dear because the landlord exacted a rent — that rent was a cost, like seed or labour, folded into the price of the loaf. Not so, said Ricardo: corn is not high because a rent is paid; a rent is paid because corn is high. The causation runs precisely the other way. The price of corn is fixed by the cost of raising it on the marginal land — the no-rent land — into whose reckoning no rent enters at all. Once that price is established, the better lands throw off their surplus, and the landlord gathers it as rent. But the rent did not lift the price by a farthing; it is the consequence of a price already lifted, by scarcity, to the level at which poor land must be worked. Rent, in a phrase, is price-determined and not price-determining: a surplus that appears after the price is set, never a cost that enters into it.
Corn is not high because a rent is paid; a rent is paid because corn is high. Rent is price-determined, and not price-determining.
The inversion holds within it a general truth that reaches far past the cornfield. What Ricardo had laid bare is that the return to a fixed factor — one whose supply cannot be enlarged however high its price may climb — is a surplus, and not a cost. Because the supply of land is what it is, the price is set out at the margin, and everything the better land earns above that margin is a residual, falling to its owner for no reason but that he owns the scarce and superior thing. Economists came in time to call this economic rent — the payment to any factor over and above what is needed to keep it in its present use — and land was merely its purest instance, the factor whose supply is the most nearly fixed and whose whole return is therefore rent. The notion would spread, as the later plates of this volume will show, to every scarce and unreproducible thing under the sun: to the fleeting scarcity of a skill, to the nearness of the city's centre, to the radio wave and the patent and the toll-gate of the digital marketplace. But the whole of it begins here, in the differential of the better field — with the discovery that what the scarce position earns its owner, it earns him simply for being scarce.
And from this clean mechanism Ricardo drew a sting that has never once lost its edge. For consider what, exactly, the landlord did to earn his rent: nothing. The fertility of the good land is, in Ricardo's own famous phrase, among “the original and indestructible powers of the soil” — a gift of nature, and no work of the owner's hand. The labourer earns his wage by his labour; the capitalist earns his profit by venturing his capital and waiting upon it; but the landlord earns his rent by the bare fact of owning the spot that nature happened to make fertile and that a swelling population happened to make dear. He grows rich, as John Stuart Mill would afterward put it, in his sleep. Rent, alone among the great shares into which the produce divides, rewards no contribution at all — only possession. And this made the landlord, in the eyes of the classical economists and of Henry George after them, the very drone of the economic order: the man who fattens upon the progress of a society to which he adds nothing, his rents swelling with every fresh mouth the population adds and every fresh acre of poor land that those mouths force under the plough.
Rent, alone among the great shares into which the produce divides, rewards no contribution at all — only possession.
The sting had a target, and a politics. Ricardo wrote in the white heat of the Corn Law controversy — the tariffs that walled out foreign grain and held English corn artificially dear — and his theory was forged as a weapon in it. For if rent rises as the price of corn rises, then the Corn Laws, by propping corn high, enriched the landlords at the direct and measurable expense of everyone else: the worker, who paid more for his bread, and the capitalist, whose profit the high wages and high rents together squeezed. Ricardo saw in the differential a deep and structural antagonism between the landlord and the rest of the nation — the landlord's gain cut straight from the capitalist's profit and the labourer's loaf — and he feared that as the population grew and ever-worse land was dragged into use, rents would climb without limit, profits would be ground toward nothing, and the whole machine of accumulation would shudder at last into a “stationary state,” presided over by landlords grown vast on the hunger of the rest. The differential was never merely a piece of analysis. It was the indictment of a class, and a prophecy of stagnation.
And yet the indictment, like the prophecy, must be qualified, for the theory is a great deal cleaner than the world it describes. Two qualifications weigh most. The first is that the “indestructible powers of the soil” are neither quite indestructible nor wholly the gift of nature. Land can be improved — drained and cleared and manured and irrigated — and it can be worn out; and where the landlord has himself sunk capital into the fertility he collects upon, his return is not the unearned surplus of the pure theory but a profit upon investment like any other, and the sharp line between the bounty of nature and the work of the owner smudges, in the actual cultivated field, past easy drawing. The second is that Ricardo's prophecy simply failed. The stationary state never arrived — because he had not reckoned upon the improvement of agriculture itself, the new techniques and the new continents of land that lifted yields faster than the population could press against them, driving the grim margin outward and the predicted stagnation away over the horizon. The differential held, as a piece of logic it holds yet; but the dynamics Ricardo hung upon it — the remorseless rise of rent, the strangling of profit — were overtaken by a force he had not foreseen, the selfsame productivity that, a volume earlier, was found unsettling the wage.
Return, then, to the question this volume opens upon, and which the differential poses in its very sharpest form. Ricardo's rent is the surplus that falls to the owner of a scarce and superior position — set at the margin, and paid for nothing the owner did — and the labour of the rest of this volume will be to ask whether that is the whole truth of the thing. On the one reading — the classical, the Georgist, the reading the differential most naturally invites — rent is pure extraction: the toll that whoever happens to own the scarce spot levies upon all who must pass across it, a private seizure of a value that nature and society, and never the owner, brought into being. On the other — the reading a defender of the order would press — the rent does necessary work: it signals the scarcity of the fixed factor, it rations the scarce land to the use that values it most, and it may, after all, repay an improvement or a risk that the bare theory passes over. Which reading is the true one is not to be settled by the differential alone; it is the argument of the whole volume, to be fought out across land and location and spectrum and the gate of the digital marketplace. But the differential frames it, cleanly and for good: the return to owning the scarce position is a surplus, and not a cost — and whether a surplus earned, or a surplus merely seized, is the question of the rent. As the table says of every price gathered within it, the argument remains open.