The Wealth of Nations

An Inquiry into the Nature and Causes of the Wealth of Nations, usually referred to by its shortened title The Wealth of Nations, is the magnum opus of the Scottish economist and moral philosopher Adam Smith. Published on 9 March 1776, the book offers one of the first accounts of what builds nations' wealth. It has become a fundamental work in classical economics, and been described as "the first formulation of a comprehensive system of political economy". Reflecting upon economics at the beginning of the Industrial Revolution, Smith introduced key concepts such as the division of labour, productivity, free markets and the role prices play in resource allocation.
The book fundamentally shaped the field of economics and provided a theoretical foundation for free market capitalism and economic policies that prevailed in the 19th century. A product of the Scottish Enlightenment and the dawn of the Industrial Revolution, the treatise offered a critical examination of the mercantilist policies of the day and advocated the implementation of free trade and effective tax policies to drive economic progress. It represented a clear paradigm shift from previous economic thought by proposing that self-interest and the forces of supply and demand, rather than regulation, should determine economic activity.
Smith laid out a system of political economy with the famous metaphor of the "invisible hand" regulating the marketplace through individual self-interest. He provided a comprehensive analysis of different economic aspects – the accumulation of stock, price determination, and the flow of labor, capital, and rent. The book contained Smith's critique of mercantilism, high taxes on luxury goods, the slave trade, and monopolies, advocating for free competition and open markets. Over revised editions during his lifetime, the work evolved and gained widespread recognition, shaping economic philosophies, government policies, and the intellectual discourse on trade, taxation, and economic growth in the coming centuries.
The Wealth of Nations was published in two volumes on 9 March 1776 (with books I–III included in the first volume and books IV and V included in the second), during the Scottish Enlightenment and the Scottish Agricultural Revolution. It influenced several authors and economists, such as Karl Marx, as well as governments and organizations, setting the terms for economic debate and discussion for the next century and a half. For example, Alexander Hamilton was influenced in part by The Wealth of Nations to write his Report on Manufactures, in which he argued against many of Smith's policies. Hamilton based much of this report on the ideas of Jean-Baptiste Colbert, and it was, in part, Colbert's ideas that Smith responded to, and criticised, with The Wealth of Nations.
The Wealth of Nations was the product of seventeen years of notes and earlier studies, as well as an observation of conversation among economists of the time (like Nicholas Magens) concerning economic and societal conditions during the beginning of the Industrial Revolution, and it took Smith some ten years to produce. The result was a treatise which sought to offer a practical application for reformed economic theory to replace the mercantilist and physiocratic economic theories that were becoming less relevant in the time of industrial progress and innovation. It provided the foundation for economists, politicians, mathematicians, and thinkers of all fields to build upon. Irrespective of historical influence, The Wealth of Nations represented a clear paradigm shift in the field of economics, comparable to what Immanuel Kant's Critique of Pure Reason was for philosophy.
Five editions of The Wealth of Nations were published during Smith's lifetime: in 1776, 1778, 1784, 1786 and 1789. Numerous editions appeared after Smith's death in 1790. To better understand the evolution of the work under Smith's hand, a team led by Edwin Cannan collated the first five editions. The differences were published along with an edited sixth edition in 1904. They found minor but numerous differences (including the addition of many footnotes) between the first and the second editions; the differences between the second and third editions are major. In 1784, Smith annexed these first two editions with the publication of Additions and Corrections to the First and Second Editions of Dr. Adam Smith's Inquiry into the Nature and Causes of the Wealth of Nations, and he also had published the three-volume third edition of the Wealth of Nations, which incorporated Additions and Corrections and, for the first time, an index. Among other things, the Additions and Corrections included entirely new sections, particularly to book 4, chapters 4 and 5, and to book 5, chapter 1, as well as an additional chapter (8), "Conclusion of the Mercantile System", in book 4.
The fourth edition, published in 1786, had only slight differences from the third edition, and Smith himself says in the Advertisement at the beginning of the book, "I have made no alterations of any kind." Finally, Cannan notes only trivial differences between the fourth and fifth editions—a set of misprints being removed from the fourth and a different set of misprints being introduced.
Of the Division of Labour: Division of labour has caused a greater increase in production than any other factor. This diversification is greatest for nations with more industry and improvement, and is responsible for "universal opulence" in those countries. This is in part due to increased quality of production, but more importantly because of increased efficiency of production, leading to a higher nominal output of units produced per time unit. Agriculture is less amenable than manufacturing to division of labour; hence, rich nations are not so far ahead of poor nations in agriculture as in manufacturing.
Of the Principle which gives Occasion to the Division of Labour: Division of labour arises not from innate wisdom, but from humans' propensity to barter.
That the Division of Labour is Limited by the Extent of the Market: Limited opportunity for exchange discourages division of labour. Because "water-carriage" (i.e. transportation) extends the market, division of labour, with its improvements, comes earliest to cities near waterways. Civilization began around the highly navigable Mediterranean Sea.
Of the Origin and Use of Money: With division of labour, the produce of one's own labour can fill only a small part of one's needs. Different commodities have served as a common medium of exchange, but all nations have finally settled on metals, which are durable and divisible, for this purpose. Before coinage, people had to weigh and assay with each exchange, or risk "the grossest frauds and impositions." Thus nations began stamping metal, on one side only, to ascertain purity, or on all sides, to stipulate purity and amount. The quantity of real metal in coins has diminished, due to the "avarice and injustice of princes and sovereign states," enabling them to pay their debts in appearance only, and to the defraudment of creditors.
Of the Wages of Labour: In this section, Smith describes how the wages of labour are dictated primarily by the competition among labourers and masters. When labourers bid against one another for limited employment opportunities, the wages of labour collectively fall, whereas when employers compete against one another for limited supplies of labour, the wages of labour collectively rise. However, this process of competition is often circumvented by combinations among labourers and among masters. When labourers combine and no longer bid against one another, their wages rise, whereas when masters combine, wages fall. In Smith's day, organised labour was dealt with very harshly by the law.
Smith himself wrote about the "severity" of such laws against worker actions, and made a point to contrast the "clamour" of the "masters" against workers' associations, while associations and collusions of the masters "are never heard by the people" though such actions are "always" and "everywhere" taking place:
In societies where the amount of labour exceeds the amount of revenue available for waged labour, competition among workers is greater than the competition among employers, and wages fall. Conversely, where revenue is abundant, labour wages rise. Smith argues that, therefore, labour wages only rise as a result of greater revenue disposed to pay for labour. Smith thought of labour as being like any other commodity in this respect:
However, the amount of revenue must increase constantly in proportion to the amount of labour for wages to remain high. Smith illustrates this by juxtaposing England with the North American colonies. In England, there is more revenue than in the colonies, but wages are lower, because more workers flock to new employment opportunities caused by the large amount of revenue – so workers eventually compete against each other as much as they did before. By contrast, as capital continues to flow to the colonial economies at least at the same rate that population increases to "fill out" this excess capital, wages there stay higher than in England.
Smith was highly concerned about the problems of poverty. He writes:
The only way to determine whether a man is rich or poor is to examine the amount of labour he can afford to purchase. "Labour is the real exchange for commodities".
Smith also describes the relation of cheap years and the production of manufactures versus the production in dear years. He argues that while some examples, such as the linen production in France, show a correlation, another example in Scotland shows the opposite. He concludes that there are too many variables to make any statement about this.
Of the Profits of Stock: In this chapter, Smith uses interest rates as an indicator of the profits of stock. This is because interest can only be paid with the profits of stock, and so creditors will be able to raise rates in proportion to the increase or decrease of the profits of their debtors.
Smith argues that the profits of stock are inversely proportional to the wages of labour, because as more money is spent compensating labour, there is less remaining for personal profit. It follows that, in societies where competition among labourers is greatest relative to competition among employers, profits will be much higher. Smith illustrates this by comparing interest rates in England and Scotland. In England, government laws against usury had kept maximum interest rates very low, but even the maximum rate was believed to be higher than the rate at which money was usually loaned. In Scotland, however, interest rates are much higher. This is the result of a greater proportion of capitalists in England, which offsets some competition among labourers and raises wages.
However, Smith notes that, curiously, interest rates in the colonies are also remarkably high (recall that, in the previous chapter, Smith described how wages in the colonies are higher than in England). Smith attributes this to the fact that, when an empire takes control of a colony, prices for a huge abundance of land and resources are extremely cheap. This allows capitalists to increase their profits, but simultaneously draws many capitalists to the colonies, increasing the wages of labour. As this is done, however, the profits of stock in the mother country rise (or at least cease to fall), as much of it has already flocked offshore.
Of Wages and Profit in the Different Employments of Labour and Stock: Smith repeatedly attacks groups of politically aligned individuals who attempt to use their collective influence to manipulate the government into doing their bidding. At the time, these were referred to as "factions", but are now more commonly called "special interests," a term that can comprise international bankers, corporate conglomerations, outright oligopolies, trade unions and other groups. Indeed, Smith had a particular distrust of the tradesman class. He felt that the members of this class, especially acting together within the guilds they want to form, could constitute a power block and manipulate the state into regulating for special interests against the general interest:
Smith also argues against government subsidies of certain trades, because this will draw many more people to the trade than what would otherwise be normal, collectively lowering their wages.
Of the Rent of the Land: Chapter 10, part ii, motivates an understanding of the idea of feudalism. Rent, considered as the price paid for the use of land, is naturally the highest the tenant can afford in the actual circumstances of the land. In adjusting lease terms, the landlord endeavours to leave him no greater share of the produce than what is sufficient to keep up the stock from which he furnishes the seed, pays the labour, and purchases and maintains the cattle and other instruments of husbandry, together with the ordinary profits of farming stock in the neighbourhood.
This is evidently the smallest share with which the tenant can content himself without being a loser, and the landlord seldom means to leave him any more. Whatever part of the produce, or, what is the same thing, whatever part of its price, is over and above this share, he naturally endeavours to reserve to himself as the rent of his land, which is evidently the highest the tenant can afford to pay in the actual circumstances of the land. Sometimes, indeed, the liberality, more frequently the ignorance, of the landlord, makes him accept of somewhat less than this portion; and sometimes too, though more rarely, the ignorance of the tenant makes him undertake to pay somewhat more, or to content himself with somewhat less, than the ordinary profits of farming stock in the neighbourhood. This portion, however, may still be considered as the natural rent of land, or the rent for which it is naturally meant that land should for the most part be let.
Of the Division of Stock:
Of Money Considered as a particular Branch of the General Stock of the Society:
Of the Accumulation of Capital, or of Productive and Unproductive Labour:
Of Stock Lent at Interest:
Of the different employment of Capital:
Adam Smith uses this example to address long-term economic growth. Smith states, "As subsistence is, in the nature of things, prior to conveniency and luxury, so the industry which procures the former, must necessarily be prior to that which ministers to the latter". In order for industrial success, subsistence is required first from the countryside. Industry and trade occur in cities while agriculture occurs in the countryside.
Agricultural work is a more desirable situation than industrial work because the owner is in complete control. Smith states that:
Where there is open countryside agriculture is much preferable to industrial occupations and ownership.
Adam Smith goes on to say "According to the natural course of things, therefore, the greater part of the capital of every growing society is, first, directed to agriculture, afterwards to manufactures, and last of all to foreign commerce". This sequence leads to growth, and therefore opulence.
Of the Discouragement of Agriculture: Chapter 2's long title is "Of the Discouragement of Agriculture in the Ancient State of Europe after the Fall of the Roman Empire".
Of the Rise and Progress of Cities and Towns, after the Fall of the Roman Empire:
How the Commerce of the Towns Contributed to the Improvement of the Country: Smith often harshly criticised those who act purely out of self-interest and greed, and warns that,
Smith vigorously attacked the antiquated government restrictions he thought hindered industrial expansion. In fact, he attacked most forms of government interference in the economic process, including tariffs, arguing that this creates inefficiency and high prices in the long run. It is believed that this theory influenced government legislation in later years, especially during the 19th century.
Smith advocated a government that was active in sectors other than the economy. He advocated public education for poor adults, a judiciary, and a standing army—institutional systems not directly profitable for private industries.
Of the Principle of the Commercial or Mercantile System: The book has sometimes been described as a critique of mercantilism and a synthesis of the emerging economic thinking of Smith's time. Specifically, The Wealth of Nations attacks, inter alia, two major tenets of mercantilism:
Of Restraints upon the Importation: Chapter 2's full title is "Of Restraints upon the Importation from Foreign Countries of such Goods as can be Produced at Home". The "invisible hand" is a frequently referenced theme from the book, although it is specifically mentioned only once.
The metaphor of the "invisible hand" has been widely used out of context. In the passage above Smith is referring to "the support of domestic industry" and contrasting that support with the importation of goods. Neoclassical economic theory has expanded the metaphor beyond the domestic/foreign manufacture argument to encompass nearly all aspects of economics.
Of the extraordinary Restraints: Chapter 3's long title is "Of the extraordinary Restraints upon the Importation of Goods of almost all Kinds, from those Countries with which the Balance is supposed to be Disadvantageous".
Of Drawbacks: Merchants and manufacturers are not contented with the monopoly of the home market, but desire likewise the most extensive foreign sale for their goods. Their country has no jurisdiction in foreign nations, and therefore can seldom procure them any monopoly there. They are generally obliged, therefore, to content themselves with petitioning for certain encouragements to exportation.
Of these encouragements what are called Drawbacks seem to be the most reasonable. To allow the merchant to draw back upon exportation, either the whole or a part of whatever excise or inland duty is imposed upon domestic industry, can never occasion the exportation of a greater quantity of goods than what would have been exported had no duty been imposed. Such encouragements do not tend to turn towards any particular employment a greater share of the capital of the country than what would go to that employment of its own accord, but only to hinder the duty from driving away any part of that shares to other employments.
Of Bounties: Bounties upon exportation are, in Great Britain, frequently petitioned for, and sometimes granted to the produce of particular branches of domestic industry. By means of them our merchants and manufacturers, it is pretended, will be enabled to sell their goods as cheap, or cheaper than their rivals in the foreign market. A greater quantity, it is said, will thus be exported, and the balance of trade consequently turned more in favour of our own country. We cannot give our workmen a monopoly in the foreign as we have done in the home market. We cannot force foreigners to buy their goods as we have done our own countrymen. The next best expedient, it has been thought, therefore, is to pay them for buying. It is in this manner that the mercantile system proposes to enrich the whole country, and to put money into all our pockets by means of the balance of trade.
Of Treaties of Commerce:
Of Colonies:
Of the Motives for establishing new Colonies:
Causes of Prosperity of new Colonies:
Of the Advantages which Europe has derived from the Discovery of America, and from that of a Passage to the East Indies by the Cape of Good Hope:
Conclusion of the Mercantile System: Smith's argument about the international political economy opposed the idea of mercantilism. While the Mercantile System encouraged each country to hoard gold, while trying to grasp hegemony, Smith argued that free trade eventually makes all actors better off. This argument is the modern 'Free Trade' argument.
Of the Agricultural Systems: Chapter 9's long title is "Of the Agricultural Systems, or of those Systems of Political Economy, which Represent the Produce of Land, as either the Sole or the Principal, Source of the Revenue and Wealth of Every Country".
Smith postulated four "maxims" of taxation: proportionality, transparency, convenience, and efficiency. Some economists interpret Smith's opposition to taxes on transfers of money, such as the Stamp Act, as opposition to capital gains taxes, which did not exist in the 18th century. Other economists credit Smith as one of the first to advocate a progressive tax. Smith wrote, "The necessaries of life occasion the great expense of the poor. They find it difficult to get food, and the greater part of their little revenue is spent in getting it. The luxuries and vanities of life occasion the principal expense of the rich, and a magnificent house embellishes and sets off to the best advantage all the other luxuries and vanities which they possess. A tax upon house-rents, therefore, would in general fall heaviest upon the rich; and in this sort of inequality there would not, perhaps, be anything very unreasonable. It is not very unreasonable that the rich should contribute to the public expense, not only in proportion to their revenue, but something more than in that proportion." Smith believed that an even "more proper" source of progressive taxation than property taxes was ground rent. Smith wrote that "nothing [could] be more reasonable" than a land value tax.
Of the Expenses of the Sovereign or Commonwealth: Smith uses this chapter to comment on the concept of taxation and expenditure by the state. On taxation, Smith wrote,
Smith advocates a tax naturally attached to the "abilities" and habits of each echelon of society.
For the lower echelon, Smith recognised the intellectually erosive effect that the otherwise beneficial division of labour can have on workers, what Marx, though he mainly opposes Smith, later named "alienation"; therefore, Smith warns of the consequence of government failing to fulfill its proper role, which is to preserve against the innate tendency of human society to fall apart.
Under Smith's model, government involvement in any area other than those stated above negatively impacts economic growth. This is because economic growth is determined by the needs of a free market and the entrepreneurial nature of private persons. A shortage of a product makes its price rise, and so stimulates producers to produce more and attracts new people to that line of production. An excess supply of a product (more of the product than people are willing to buy) drives prices down, and producers refocus energy and money to other areas where there is a need.
Of the Sources of the General or Public Revenue of the Society: In his discussion of taxes in Book Five, Smith wrote:
He also introduced the distinction between a direct tax, and by implication an indirect tax (although he did not use the word "indirect"):
And further:
This term was later used in United States, Article I, Section 2, Clause 3 of the U.S. Constitution, and James Madison, who wrote much of the Constitution, is known to have read Smith's book.
Of War and Public Debts:
Smith then goes on to say that even if money was set aside from future revenues to pay for the debts of war, it seldom actually gets used to pay down the debt. Politicians are inclined to spend the money on some other scheme that will win the favour of their constituents. Hence, interest payments rise and war debts continue to grow larger, well beyond the end of the war.
Summing up, if governments can borrow without check, then they are more likely to wage war without check, and the costs of the war spending will burden future generations, since war debts are almost never repaid by the generations that incurred them.
The first edition of the book sold out in six months. The printer William Strahan wrote on 12 April 1776 that David Hume said The Wealth of Nations required too much thought to be as popular as Edward Gibbon's The History of the Decline and Fall of the Roman Empire. Strahan also wrote: "What you say of Mr. Gibbon's and Dr. Smith's book is exactly just. The former is the most popular work; but the sale of the latter, though not near so rapid, has been more than I could have expected from a work that requires much thought and reflection (qualities that do not abound among modern readers) to peruse to any purpose." Gibbon wrote to Adam Ferguson on 1 April: "What an excellent work is that with which our common friend Mr. Adam Smith has enriched the public! An extensive science in a single book, and the most profound ideas expressed in the most perspicuous language". The review of the book in the Annual Register was probably written by Whig MP Edmund Burke. In 1791, the English-born radical Thomas Paine wrote in his Rights of Man that "Had Mr. Burke possessed talents similar to the author 'On the Wealth of Nations,' he would have comprehended all the parts which enter into, and, by assemblage, form a constitution."
One of the earliest published extended criticisms of Adam Smith's economic theory came in an unlikely medium: footnotes to the introduction to a translation of Luís de Camões's The Lusiads, the Portuguese epic poem of 1572 about the discovery by Europeans of a sea route to Asia, by Scottish poet William Julius Mickle. In the introduction to the first edition, 1776, Mickle described the poem as "the Epic Poem of the Birth of Commerce", having direct interest to contemporary discussions of "the true spirit of commerce"; the second edition, published 1778, featured an expanded introduction in which Mickle launched a violent attack on Smith and his laissez-faire doctrines as applied to the East India Company issue, as opposed to Mickle's views of an ideal Christian, righteous, and naturally superior empire. Mickle's dislike of Smith appears to have been political but personal as well: he believed that Smith had advised his former pupil, the Duke of Buccleuch, against becoming the patron of the first edition of The Lusiads.
In 1800, the Anti-Jacobin Review criticized The Wealth of Nations. In 1803, The Times argued against war with Spain:
In 1810, a correspondent writing under the pseudonym of Publicola included at the head of his letter Smith's line that "Exclusive Companies are nuisances in every respect" and called him "that learned writer". In 1812, Robert Southey of the Quarterly Review condemned The Wealth of Nations as a "tedious and hard-hearted book". In 1821, The Times quoted Smith's opinion that the interests of corn dealers and the people were the same. In 1826, the English radical William Cobbett criticised in his Rural Rides the political economists' hostility to the Poor Law: "Well, amidst all this suffering, there is one good thing; the Scotch political economy is blown to the devil, and the Edinburgh Review and Adam Smith along with it". In 1829, Thomas Carlyle named Smith as one of the philosophers of the age who taught that "our happiness depends entirely on external circumstances" and to whose eye "all is well that works quietly."
The Liberal statesman William Ewart Gladstone chaired the meeting of the Political Economy Club to celebrate the centenary of the publication of The Wealth of Nations. The Liberal historian Lord Acton believed that The Wealth of Nations gave a "scientific backbone to liberal sentiment" and that it was the "classic English philosophy of history".
Smith's biographer John Rae contended that The Wealth of Nations shaped government policy soon after it was published.
In 1777, in the first budget after the book was published, Prime Minister Lord North got the idea for two new taxes from the book: one on man-servants and the other on property sold at auction. The budget of 1778 introduced the inhabited house duty and the malt tax, both recommended by Smith. In 1779, Smith was consulted by politicians Henry Dundas and Lord Carlisle on the subject of giving Ireland free trade.
The Wealth of Nations was first mentioned in Parliament by the Whig leader Charles James Fox on 11 November 1783:
However Fox once told Charles Butler sometime after 1785 that he had never read the book and that "There is something in all these subjects which passes my comprehension; something so wide that I could never embrace them myself nor find any one who did." When Fox was dining with Lord Lauderdale in 1796, Lauderdale remarked that they knew nothing of political economy before Adam Smith wrote. "Pooh," replied Fox, "your Adam Smiths are nothing, but" (he added, turning to the company) "that is his love; we must spare him there." Lauderdale replied: "I think he is everything", to which Fox rejoined: "That is a great proof of your affection". Fox also found Adam Smith "tedious" and believed that one half of The Wealth of Nations could be "omitted with much benefit to the subject".
The Wealth of Nations was next mentioned in Parliament by Robert Thornton MP in 1787 to support the Commercial Treaty with France. In the same year George Dempster MP referenced it in the debate on the proposal to farm the post-horse duties and in 1788 by a Mr. Hussy on the Wool Exportation Bill.
The prime minister, William Pitt, praised Smith in the House of Commons on 17 February 1792: "…an author of our own times now unfortunately no more (I mean the author of a celebrated treatise on the Wealth of Nations), whose extensive knowledge of detail, and depth of philosophical research will, I believe, furnish the best solution to every question connected with the history of commerce, or with the systems of political economy." In the same year it was quoted by Samuel Whitbread MP and Fox (on the division of labour) in the debate on the armament against Russia and also by William Wilberforce in introducing his Bill against the slave trade. The book was not mentioned in the House of Lords until a debate in 1793 between Lord Lansdowne and Lord Loughborough about revolutionary principles in France. On 16 May 1797, Pitt said in the debate on the suspension of cash payments by the Bank of England that Smith was "that great author" but his arguments, "though always ingenious", were "sometimes injudicious". In 1798, Sir John Mitford, the Solicitor-General, cited the book in his criticism of bills of exchange given in consideration of other bills.
During a debate on the price of corn in 1800 Lord Warwick said:
Lord Grenville replied:
The Radical MP Richard Cobden studied The Wealth of Nations as a young man; his copy is still in the library of his home at Dunford House and there are marginal notes on the places where Smith criticizes British colonial policies. There are none on the passage about the invisible hand. Cobden campaigned for free trade in his agitation against the Corn Laws. In 1843, Cobden quoted Smith's protest against the "plain violation of the most sacred property" of every man derived from his labour. In 1844, he cited Smith's opposition to slave labour and claimed that Smith had been misrepresented by protectionists as a monopolist. In 1849, Cobden claimed that he had "gone through the length and breadth of this country, with Adam Smith in my hand, to advocate the principles of Free Trade." He also said he had tried "to popularise to the people of this country, and of the Continent, those arguments with which Adam Smith ... and every man who has written on this subject, have demonstrated the funding system to be injurious to mankind."
Cobden believed it to be morally wrong to lend money to be spent on war. In 1849, when The Times claimed political economists were against Cobden on this, Cobden wrote: "I can quote Adam Smith whose authority is without appeal now in intellectual circles, it gives one the basis of science upon which to raise appeals to the moral feelings." In 1850, when the Russian government attempted to raise a loan to cover the deficit brought about by its war against Hungary, Cobden said: "I take my stand on one of the strongest grounds in stating that Adam Smith and other great authorities on political economy are opposed to the very principle of such loans." In 1863, during Cobden's dispute with The Times over its claims that his fellow Radical John Bright wanted to divide the land of the rich amongst the poor, Cobden read to a friend the passage in the Wealth of Nations which criticized primogeniture and entail. Cobden said that if Bright had been as plain-speaking as Smith, "how he would have been branded as an incendiary and Socialist". In 1864, Cobden proclaimed, "If I were five-and-twenty or thirty, ... I would take Adam Smith in hand, and I would have a League for free trade in Land just as we had a League for free trade in Corn. You will find just the same authority in Adam Smith for the one as for the other."
After the conquest of New France in 1760 during the French and Indian War, Charles Townshend suggested that the American colonists provide help to pay for the war debt by paying an additional tax on tea. During this time, Adam Smith was working for Townshend and developed a relationship with Benjamin Franklin, who played a vital role in the American Revolution three months after Smith's The Wealth of Nations book was released.
James Madison, in a speech given in Congress on 2 February 1791, cited The Wealth of Nations in opposing a national bank: "The principal disadvantages consisted in, 1st. banishing the precious metals, by substituting another medium to perform their office: This effect was inevitable. It was admitted by the most enlightened patrons of banks, particularly by Smith on the Wealth of Nations." Thomas Jefferson, writing to John Norvell on 14 June 1807, claimed that on "the subjects of money & commerce, Smith's Wealth of Nations is the best book to be read, unless Say's Political Economy can be had, which treats the same subject on the same principles, but in a shorter compass & more lucid manner."
The Wealth of Nations was translated into French, German and Spanish in the late 18th century.
The French version by Germain Garnier was not the first to appear, but is regarded as better than earlier translations. In the 1840s, Jérôme-Adolphe Blanqui, a free trader, supplemented Garnier's translation with notes and comments by the principal economists in Europe.
The Spanish Inquisition banned The Wealth of Nations in French translation, but José Alonso Ortiz was able to publish a virtually complete Spanish translation (although he appears to have self-censored the text as it relates to usury). This translation, which was dedicated to Manuel Godoy, has remained in print, although it has been modernised by later editors.
With 36,331 citations, it is the second most cited book in economics published before 1950, behind Karl Marx's Das Kapital.
George Stigler attributes to Smith "the most important substantive proposition in all of economics" and foundation of resource-allocation theory. It is that, under competition, owners of resources (labour, land, and capital) will use them most profitably, resulting in an equal rate of return in equilibrium for all uses (adjusted for apparent differences arising from such factors as training, trust, hardship, and unemployment). He also describes Smith's theorem that "the division of labour is limited by the extent of the market" as the "core of a theory of the functions of firm and industry" and a "fundamental principle of economic organisation."
Paul Samuelson finds in Smith's pluralist use of supply and demand—as applied to wages, rents, and profit—a valid and valuable anticipation of the general equilibrium modelling of Walras a century later. Moreover, Smith's allowance for wage increases in the short and intermediate term from capital accumulation and invention added a realism missed later by Malthus and Ricardo in their propounding a rigid subsistence-wage theory of labour supply.
In noting the last words of the Wealth of Nations,
Ronald Coase suggests that if Smith's earlier proposal of granting colonies representation in the British parliament proportional to their contributions to public revenues had been followed, "there would have been no 1776, … America would now be ruling England, and we [in America] would be today celebrating Adam Smith not simply as the author of the Wealth of Nations, but hailing him as a founding father."
Mark Blaug argues that it was Smith's achievement to shift the burden of proof against those maintaining that the pursuit of self-interest does not achieve social good. But he notes Smith's relevant attention to definite institutional arrangements and process as disciplining self-interest to widen the scope of the market, accumulate capital, and grow income.
Economic anthropologist David Graeber argues that throughout antiquity one can identify many different systems of credit and later monetary exchange, drawing evidence for his argument from historical and also ethnographical records, that the traditional explanation for the origins of monetary economies from primitive bartering systems, as laid out by Adam Smith, does not find empirical support. The author argues that credit systems developed as means of account long before the advent of coinage around 600 BCE, and can still be seen operating in non-monetary economies. The idea of barter, on the other hand, seems only to apply to limited exchanges between societies that had infrequent contact and often in a context of ritualised warfare, rendering its conceptualisation among economists as a myth. As an alternative explanation for the creation of economic life, the author suggests that it originally related to social currencies, closely related to non-market quotidian interactions among a community and based on the "everyday communism" that is based on mutual expectations and responsibilities among individuals. This type of economy is, then, contrasted with the moral foundations of exchange based on formal equality and reciprocity (but not necessarily leading to market relations) and hierarchy, based on clear inequalities that tend to crystallise in customs and castes.