The Physiocrats

Overview

The Physiocrats were the first organized school of economic thought, active in France in the mid-to-late 18th century and led by the court physician François Quesnay (1694–1774), the statesman-economist A.R.J. Turgot (1727–1781), and the publicist Victor de Riqueti, marquis de Mirabeau ("the elder Mirabeau"). The name derives from the Greek phýsis ("nature") and kràtos ("power"): they held that an economy's wealth flowed ultimately from the land, and that only the agricultural sector produced a genuine surplus — the produit net (net product) — over and above the costs of cultivation.[1]

Quesnay set out this vision in his Tableau économique (1758), a "zigzag" circular-flow diagram tracing how output and spending moved among three classes: landowners, the productive (agricultural) class, and a "sterile" class of manufacturers and others who, in the Physiocratic model, merely consumed what they produced and left no surplus for the next period.[1] Because in their theory only land generated a true surplus, the Physiocrats argued that all the miscellaneous taxes, tolls, and regulations burdening the French economy should be swept away and replaced by a single tax falling on that surplus — the impôt unique, a single tax on the net product of land. Henry George reports that the elder Mirabeau "ranked the proposition of Quesnay, to substitute one single tax on rent (the impôt unique) for all other taxes, as a discovery equal in utility to the invention of writing or the substitution of the use of money for barter."[2a] Quesnay also coined the phrase "laissez-faire, laissez-passer," and the school's attack on the mercantilism of Louis XV's finance minister Colbert anticipated much of classical free-trade economics.[1] Turgot, as intendant of Limoges and later finance minister (1774–1776), attempted to put Physiocratic reform into practice, and his analysis of capital, competition, and diminishing returns anticipated Adam Smith.[3]

Relevance to Georgism

The Physiocrats are the most direct pre-classical ancestors of the Georgist single tax. The lineage runs Physiocracy → the classical critique → George:

• The idea George revived. In Progress and Poverty, Book VIII, Ch. IV ("Indorsements and Objections"), George explicitly credits the school: "The French Economists of the last century, headed by Quesnay and Turgot, proposed just what I have proposed, that all taxation should be abolished save a tax upon the value of land."[2] He acknowledged reaching his own conclusion independently — "Without knowing anything of Quesnay or his doctrines, I have reached the same practical conclusion by a route which cannot be disputed"[2] — but recognized the Physiocrats had grasped "the fundamental relation between land and labor which has since been lost sight of."[2]
• The classical hand-off. Adam Smith met the Physiocrats in France and admired them, while criticizing the doctrine that manufacturing is "sterile" — see Smith's own chapter-length assessment below[1][4]; through Smith and Ricardo the analysis of rent passed into classical economics, where George picked it up.[1] The Physiocrats thus form the first link in the chain that produced the law of rent.
• Where George honestly differed. George taxed land rent — the value of location and the unearned increment — not merely agricultural produce, and he rejected the Physiocrats' claim that only agriculture is "productive." He treated their peculiar terminology cautiously, saying he knew their doctrines "only at second hand" and could not tell how far their ideas about "agriculture being the only productive avocation" were "erroneous apprehensions, or mere peculiarities of terminology" (Book VIII, Ch. IV).[2] The Physiocrats' surplus was tied to farming; George's rent arises wherever fixed natural opportunities command a premium — a broader and, in modern terms, sounder basis for the same single-tax conclusion (see the rent gradient: land is the clean, fixed-supply case).

Adam Smith's Direct Critique (Wealth of Nations, Book IV, Ch. IX)

Smith devotes the whole of Book IV, Chapter IX ("Of the Agricultural Systems...") of The Wealth of Nations (1776) to an extended assessment of the Physiocrats — his single most sustained engagement, in the entire book, with one rival system of political economy (the mercantile system, by contrast, is dismantled piecemeal across eight separate chapters). He traces the doctrine's origin to an overcorrection of Colbert's mercantilism, which had favoured the towns at the country's expense: "If the rod be bent too much one way, says the proverb, in order to make it straight, you must bend it as much the other... as in the plan of Mr Colbert, the industry of the towns was certainly overvalued in comparison with that of the country, so in their system it seems to be as certainly under-valued." (Book IV, Ch. IX)

Smith lays out the three-class model accurately — proprietors, the "productive class" of cultivators, and the "barren or unproductive class" of artificers, manufacturers, and merchants — before mounting a five-point rebuttal (numbered "First," "Secondly," through "Fifthly and lastly" in the text) of what he names outright as "the capital error of this system": "its representing the class of artificers, manufacturers, and merchants, as altogether barren and unproductive." (Book IV, Ch. IX) His lead objection is that manufacturing labour, unlike a menial servant's, "naturally does fix and realize itself in some such vendible commodity" — invoking, by his own cross-reference, the productive/unproductive distinction he had already drawn in Book II, Ch. III: "the labour of a manufacturer adds generally to the value of the materials which he works upon... But the maintenance of a menial servant never is restored." (Book II, Ch. III) Smith notes this is exactly the passage where "I have classed artificers, manufacturers, and merchants among the productive labourers, and menial servants among the barren or unproductive" (Book IV, Ch. IX) — his own definition doing double duty as the tool of his critique.

Despite the rebuttal, Smith's verdict is admiring, and this is the line Georgists and historians of economics quote most:

"This system, however, with all its imperfections, is perhaps the nearest approximation to the truth that has yet been published upon the subject of political economy... though in representing the labour which is employed upon land as the only productive labour, the notions which it inculcates are, perhaps, too narrow and confined; yet in representing the wealth of nations as consisting, not in the unconsumable riches of money, but in the consumable goods annually reproduced by the labour of the society, and in representing perfect liberty as the only effectual expedient for rendering this annual reproduction the greatest possible, its doctrine seems to be in every respect as just as it is generous and liberal." (Book IV, Ch. IX)

Smith also supplies the physician-regimen analogy for Quesnay's central claim — the "exact regimen of perfect liberty and perfect justice" — and his own resilience objection to it:

"Mr Quesnai... seems to have entertained a notion... that [the political body] would thrive and prosper only under a certain precise regimen, the exact regimen of perfect liberty and perfect justice. He seems not to have considered, that in the political body, the natural effort which every man is continually making to better his own condition, is a principle of preservation capable of preventing and correcting, in many respects, the bad effects of a political economy, in some degree both partial and oppressive." (Book IV, Ch. IX)

That "principle of preservation" — ordinary self-interest offsetting bad policy, so that "if a nation could not prosper without the enjoyment of perfect liberty and perfect justice, there is not in the world a nation which could ever have prospered" (Book IV, Ch. IX) — is Smith's own answer to the Physiocrats' all-or-nothing regimen, and it leads directly into the chapter's close, where Smith sets out his own alternative: the "system of natural liberty," under which the sovereign is reduced to three duties — defence, justice, and the public works no individual could profitably build alone (Book IV, Ch. IX). The Physiocrats' impôt unique is thus not merely a proposal Smith mentions in passing (Book V, Ch. II, quoted on the book page) — it is the doctrine against which he works out his own founding statement of laissez-faire.

Smith closes the chapter crediting the school's practical influence in France — lease terms against future purchasers extended "from nine to twenty-seven years" and provincial restraints on the corn trade abolished (Book IV, Ch. IX) — and records the school's own reverence for its founder via the elder Mirabeau's tribute ranking the Économical Table with writing and money among history's "three great inventions which have principally given stability to political societies... the great discovery of our age, but of which our posterity will reap the benefit" (Book IV, Ch. IX, quoting Mirabeau) — Smith's primary rendering of the same Mirabeau tribute George paraphrases above as ranking the impôt unique "a discovery equal in utility to the invention of writing."[2] He identifies Mercier de la Rivière's The Natural and Essential Order of Political Societies as "the most distinct and best connected account of this doctrine." (Book IV, Ch. IX) (A-claims for the quotations, public domain text.)

See Also

• Single Tax — George's proposal, of which the impôt unique is the 18th-century forerunner
• Land Value Tax — the modern instrument descended from this lineage
• Adam Smith — the classical economist who absorbed and criticized Physiocracy
• The Wealth of Nations (Smith) — Smith's chapter-length assessment of the Physiocrats, Book IV, Ch. IX
• Henry George — who revived the single-tax idea on a rent rather than agricultural basis
• Law of Rent — the Ricardian theory of rent that grew out of the classical response to Physiocracy
• Economic Rent — the surplus the Physiocrats located in land

Sources

1. David R. Henderson (ed.), "François Quesnay (1694–1774)," The Concise Encyclopedia of Economics / Library of Economics and Liberty (Econlib). econlib.org — used for Quesnay as leader of the first school of economics, the origin of the name "Physiocrat," the Tableau économique and its three classes (landowners, farmers, "sterile"), the produit-net/surplus doctrine, "laissez-faire, laissez-passer," and the critique of Colbertist mercantilism.
2. Henry George, Progress and Poverty (1879), Book VIII, Ch. IV ("Indorsements and Objections"). Project Gutenberg eBook #55308. gutenberg.org — used for George's acknowledgment that Quesnay and Turgot "proposed just what I have proposed," for George's statement that he reached the conclusion independently, and for his honest reservation about the Physiocrats' "agriculture being the only productive avocation" doctrine. 2a. Henry George, Progress and Poverty (1879), Book IX, Ch. I ("Of the Effect Upon the Production of Wealth"). Project Gutenberg eBook #55308. gutenberg.org — used for Mirabeau's praise of the impôt unique as a discovery equal to the invention of writing (corrected 2026-07-18: an earlier pass grouped this quotation under the Book VIII citation above; it is in fact in Book IX).
3. David R. Henderson (ed.), "A.R.J. Turgot (1727–1781)," The Concise Encyclopedia of Economics / Library of Economics and Liberty (Econlib). econlib.org — used for Turgot as a leading Physiocrat and reformer, his theory of capital, competition, and diminishing returns, his anticipation of Adam Smith, and his tenure as intendant of Limoges and finance minister (1774–1776).
4. Adam Smith (1776), The Wealth of Nations, Book IV, Ch. IX ("Of the Agricultural Systems..."), and Book II, Ch. III (productive/unproductive labour, cross-referenced by Smith himself in Ch. IX) — used for Smith's own chapter-length assessment of the Physiocrats: the Colbert-overcorrection origin story, the three-class model, the five-point rebuttal of the "barren and unproductive" doctrine, the "with all its imperfections" verdict, the Quesnay-as-physician/"exact regimen of perfect liberty and perfect justice" passage, the Mirabeau "three great inventions" tribute, and the Mercier de la Rivière citation (A-claims for the quotations; public domain, published 1776, author died 1790; verified verbatim against the repo-hosted text 2026-07-18). Complete text held in this repository: sources/publicdomain/wealth-of-nations.md (Project Gutenberg #3300). Georgist-lens summary: The Wealth of Nations · Adam Smith.