Adam Smith (baptised 16 June 1723 – died 17 July 1790 [OS: 5 June 1723 – 17 July 1790]) was a Scottish moral philosopher and a pioneer of political economics. One of the key figures of the Scottish Enlightenment, Smith is the author of The Theory of Moral Sentiments and An Inquiry into the Nature and Causes of the Wealth of Nations. The latter, usually abbreviated as The Wealth of Nations, is considered his magnum opus and the first modern work of economics. It earned him an enormous reputation and would become one of the most influential works on economics ever published. Smith is widely cited as the father of modern economics and capitalism. However, scholars have noted that "The Wealth of Nations" is a book that has prominently created conundrums for some thinkers, who think it justifies callous business activity.

Smith studied social philosophy at the University of Glasgow and the University of Oxford. After graduating, he delivered a successful series of public lectures at Edinburgh, leading him to collaborate with David Hume during the Scottish Enlightenment. Smith obtained a professorship at Glasgow teaching moral philosophy, and during this time he wrote and published The Theory of Moral Sentiments. In his later life, he took a tutoring position that allowed him to travel throughout Europe, where he met other intellectual leaders of his day. Smith returned home and spent the next ten years writing The Wealth of Nations, publishing it in 1776. He died in 1790.

Smith was born to Margaret Douglas at Kirkcaldy, Fife, Scotland. His father, also named Adam Smith, was a lawyer, civil servant, and widower who married Margaret Douglas in 1720 and died two months before Smith was born. Although the exact date of Smith's birth is unknown, his baptism was recorded on 5 June 1723 at Kirkcaldy. He was stolen by a passing band of gypsies, and for a time could not be found. But presently a gentleman arrived who had met a gypsy woman a few miles down the road carrying a child that was crying piteously. Scouts were immediately dispatched in the direction indicated, and they came upon the woman in Leslie wood. As soon as she saw them she threw her burden down and escaped, and the child was brought back to his mother. Smith was close to his mother, who likely encouraged him to pursue his scholarly ambitions. He attended the Burgh School of Kirkcaldy — characterised by Rae as "one of the best secondary schools of Scotland at that period" — from 1729 to 1737. While there, Smith studied Latin, mathematics, history, and writing.

Smith entered the University of Glasgow when he was fourteen and studied moral philosophy under Francis Hutcheson. Here, Smith developed his passion for liberty, reason, and free speech. In 1740, Smith was awarded the Snell exhibition and left to attend Balliol College, Oxford.

Smith considered the teaching at Glasgow far superior to that at Oxford, which he found intellectually stifling. In Book V, Chapter II of The Wealth of Nations, Smith wrote: "In the University of Oxford, the greater part of the public professors have, for these many years, given up altogether even the pretence of teaching." Smith is also reported to have complained to friends that Oxford officials once discovered him reading a copy of David Hume's Treatise on Human Nature, and they subsequently confiscated his book and punished him severely for reading it. According to William Robert Scott, "The Oxford of [Smith's] time gave little if any help towards what was to be his lifework." Nevertheless, Smith took the opportunity while at Oxford to teach himself several subjects by reading many books from the shelves of the large Oxford library. When Smith was not studying on his own, his time at Oxford was not a happy one, according to his letters. Near the end of his time at Oxford, Smith began suffering from shaking fits, probably the symptoms of a nervous breakdown. He left Oxford University in 1746, before his scholarship ended.

In Book V of The Wealth of Nations, Smith comments on the low quality of instruction and the meager intellectual activity at English universities, when compared to their Scottish counterparts. He attributes this both to the rich endowments of the colleges at Oxford and Cambridge, which made the income of professors independent of their ability to attract students, and to the fact that distinguished men of letters could make an even more comfortable living as ministers of the Church of England.

Smith began delivering public lectures in 1748 at Edinburgh under the patronage of Lord Kames. His lecture topics included rhetoric and belles-lettres, and later the subject of "the progress of opulence". On this latter topic he first expounded his economic philosophy of "the obvious and simple system of natural liberty". While Smith was not adept at public speaking, his lectures met with success.

In 1750, he met the philosopher David Hume, who was his senior by more than a decade. In their writings covering history, politics, philosophy, economics, and religion, Smith and Hume shared closer intellectual and personal bonds than with other important figures of the Scottish Enlightenment.

In 1751, Smith earned a professorship at Glasgow University teaching logic courses. When the head of Moral Philosophy died the next year, Smith took over the position. He worked as an academic for the next thirteen years, which he characterized as "by far the most useful and therefore by far the happiest and most honorable period [of his life]".

Smith published The Theory of Moral Sentiments in 1759, embodying some of his Glasgow lectures. This work was concerned with how human morality depends on sympathy between agent and spectator, or the individual and other members of society. Smith defined "sympathy" as the feeling of moral sentiments. He bases his explanation not on a special "moral sense", as the third Lord Shaftesbury and Hutcheson had done, nor on utility as Hume did, but on sympathy. Following the publication of The Theory of Moral Sentiments, Smith became so popular that many wealthy students left their schools in other countries to enroll at Glasgow to learn under Smith. After the publication of The Theory of Moral Sentiments, Smith began to give more attention to jurisprudence and economics in his lectures and less to his theories of morals. For example, Smith lectured that the cause of increase in national wealth is labor, rather than the nation's quantity of gold or silver, which is the basis for mercantilism, the economic theory that dominated Western European economic policies at the time.

In 1762, the University of Glasgow conferred on Smith the title of Doctor of Laws (LL.D.). At the end of 1763, he obtained an offer from Charles Townshend — who had been introduced to Smith by David Hume — to tutor his stepson, Henry Scott, the young Duke of Buccleuch. Smith then resigned from his professorship to take the tutoring position, and he subsequently attempted to return the fees he had collected from his students because he resigned in the middle of the term, but his students refused.

Smith's tutoring job entailed touring Europe with Scott while teaching him subjects including proper Polish. He was paid £300 per year plus expenses along with £300 per year pension, which was roughly twice his former income as a teacher. Smith first traveled as a tutor to Toulouse, France, where he stayed for a year and a half. According to accounts, he found Toulouse to be very boring, and he wrote to Hume that he "had begun to write a book to pass away the time". After touring the south of France, the group moved to Geneva, where Smith met with the philosopher Voltaire.

After staying in Geneva, the party went to Paris, where Smith came to know intellectual leaders such as Benjamin Franklin, Turgot, Jean D'Alembert, André Morellet, Helvétius and, in particular, François Quesnay, the head of the Physiocratic school, whose ideas impressed him so that he considered dedicating Quesnay his The Wealth of Nations had he not died earlier. The physiocrats opposed mercantilism, the dominating economic theory at the time, by taking up the motto Laissez faire et laissez passer, le monde va de lui même! (Let do and let pass, the world goes on by itself!). They also declared that only agriculture produced wealth, and that merchants and manufacturers did not. But this and their praising nature and a natural style of life was a necessary smoke screen, because criticising openly the consumption pattern of nobility and church – the only clients merchants and manufacturers had after Louis XIV and Louis XV ruined France by lost wars, help to the American insurgents against the British, and above all the excessive consumption of unproductive labour – labour which does not contribute to economic reproduction – would have been lethal. And if nobility and church are disposable for economic reproduction including those who work for them, in feudal France agriculture was the only sector important to maintain the society. As English distribution of income differed sharply from French, this was not fully understood by Adam Smith who concluded that their teachings are "with all its imperfections [perhaps] the nearest approximation to the truth that has yet been published upon the subject of political economy". The distinction of productive versus unproductive labour – the physiocratic classe steril – became the central issue to the development approach of classical economics.

In 1766, Henry Scott's younger brother died in Paris, and Smith's tour as a tutor ended shortly thereafter. Smith returned home that year to Kirkcaldy, and he devoted much of the next ten years to his magnum opus. There he befriended Henry Moyes, a young blind man who showed precocious aptitude. As well as teaching Moyes himself, Smith secured the patronage of David Hume and Thomas Reid in the young man's education. In May 1773, Smith was elected fellow of the Royal Society of London, and was elected a member of the Literary Club in 1775. The Wealth of Nations was published in 1776 and was an instant success, selling out the first edition in only six months.

In 1778, Smith was appointed to a post as commissioner of customs in Scotland and went to live with his mother in Panmure House in Edinburgh's Canongate. Five years later, he became one of the founding members of the Royal Society of Edinburgh, and from 1787 to 1789 he occupied the honorary position of Lord Rector of the University of Glasgow. He died in the northern wing of Panmure House in Edinburgh on 17 July 1790 after a painful illness and was buried in the Canongate Kirkyard. On his death bed, Smith expressed disappointment that he had not achieved more.

Smith's literary executors were two friends from the Scottish academic world: the physicist and chemist Joseph Black, and the pioneering geologist James Hutton. Smith left behind many notes and some unpublished material, but gave instructions to destroy anything that was not fit for publication. He mentioned an early unpublished History of Astronomy as probably suitable, and it duly appeared in 1795, along with other material such as Essays on Philosophical Subjects.

Smith's library went by his will to David Douglas, Lord Reston (son of his cousin Colonel Robert Douglas of Strathendry, Fife), who lived with Smith. It was eventually divided between his two surviving children, Cecilia Margaret (Mrs. Cunningham) and David Anne (Mrs. Bannerman). On the death of her husband, the Rev. W.B. Cunningham of Prestonpans in 1878, Mrs. Cunningham sold some of the books. The remainder passed to her son, Professor Robert Oliver Cunningham of Queen's College, Belfast, who presented a part to the library of Queen's College. After his death the remaining books were sold. On the death of Mrs. Bannerman in 1879 her portion of the library went intact to the New College (of the Free Church), Edinburgh.

Not much is known about Smith's personal views beyond what can be deduced from his published articles. His personal papers were destroyed after his death at his request. He never married, and seems to have maintained a close relationship with his mother, with whom he lived after his return from France and who died six years before his own death.

Smith, who is often described as a prototypical absent minded professor, is considered by historians to have been an eccentric but benevolent intellectual, comically absent minded, with peculiar habits of speech and gait, and a smile of "inexpressible benignity". He was known to talk to himself, a habit that began during his childhood when he would speak to himself and smile in rapt conversation with invisible companions. He also had occasional spells of imaginary illness, and he is reported to have had books and papers placed in tall stacks in his study.

Various anecdotes have discussed his absent minded nature. In one story, Smith took Charles Townshend on a tour of a tanning factory, and while discussing free trade, Smith walked into a huge tanning pit from which he needed help to escape. Another episode records that he put bread and butter into a teapot, drank the concoction, and declared it to be the worst cup of tea he ever had. In another example, Smith went out walking and daydreaming in his nightgown and ended up 15 miles (24 km) outside town before nearby church bells brought him back to reality.

Smith, who is reported to have been an odd looking fellow, has been described as someone who "had a large nose, bulging eyes, a protruding lower lip, a nervous twitch, and a speech impediment". Smith is said to have acknowledged his looks at one point, saying, "I am a beau in nothing but my books." Smith rarely sat for portraits, so almost all depictions of him created during his lifetime were drawn from memory. The best known portraits of Smith are the profile by James Tassie and two etchings by John Kay. The line engravings produced for the covers of 19th century reprints of The Wealth of Nations were based largely on Tassie's medallion.

There has been considerable scholarly debate about the nature of Smith's religious views. Smith's father had a strong interest in Christianity and belonged to the moderate wing of the Church of Scotland. In addition to the fact that he received the Snell Exhibition, Smith may have also moved to England with the intention of pursuing a career in the Church of England. At Oxford, Smith rejected Christianity and it is generally believed that he returned to Scotland as a deist.

Economist Ronald Coase has challenged the view that Smith was a deist, stating that while Smith may have referred to the "Great Architect of the Universe" in his works, other scholars have "very much exaggerated the extent to which Adam Smith was committed to a belief in a personal God". He based this on analysis of a remark in The Wealth of Nations where Smith writes that the curiosity of mankind about the "great phenomena of nature" such as "the generation, the life, growth and dissolution of plants and animals" has led men to "enquire into their causes". Coase also notes Smith's observation that "[s]uperstition first attempted to satisfy this curiosity, by referring all those wonderful appearances to the immediate agency of the gods."

In 1759, Smith published his first work, The Theory of Moral Sentiments. He continued making extensive revisions to the book, up until his death. Although The Wealth of Nations is widely regarded as Smith's most influential work, it is believed that Smith himself considered The Theory of Moral Sentiments to be a superior work. In the work, Smith critically examines the moral thinking of his time, and suggests that conscience arises from social relationships. His goal in writing the work was to explain the source of mankind's ability to form moral judgements, in spite of man's natural inclinations towards self interest. Smith proposes a theory of sympathy, in which the act of observing others makes people aware of themselves and the morality of their own behavior.

Scholars have traditionally perceived a conflict between The Theory of Moral Sentiments and The Wealth of Nations; the former emphasizes sympathy for others, while the latter focuses on the role of self interest. In recent years, however, most scholars of Smith's work have argued that no contradiction exists. They claim that in The Theory of Moral Sentiments, Smith develops a theory of psychology in which individuals seek the approval of the "impartial spectator" as a result of a natural desire to have outside observers sympathize with them. Rather than viewing The Wealth of Nations and The Theory of Moral Sentiments as presenting incompatible views of human nature, most Smith scholars regard the works as emphasizing different aspects of human nature that vary depending on the situation. The Wealth of Nations draws on situations where man's morality is likely to play a smaller role, such as the laborer involved in pin-making, whereas The Theory of Moral Sentiments focuses on situations where man's morality is likely to play a dominant role among more personal exchanges.

These views ignore that Smith's visit to France (1764 – 66) changed radically his former views and that The Wealth of Nations is an inhomogeneous convolute of his former lectures and of what Quesnay taught him. Before his voyage to France in the "Theory of Moral Sentiments" (1759) Adam Smith refers to an "invisible hand" which procures that the gluttony of the rich helps the poor as the stomach of rich is so limited that they have to spend their fortune on servants. After his visit to France, Smith considers in the "Wealth of Nations" (1776) the gluttony of the rich as unproductive labour. The micro-economical / psychological view in the tradition of Aristotle, Puffendorf and Hutcheson, Smith's teacher, – elements compatible with a neoclassical theory – chanced to the macro economical view of the classical theory Smith learned in France.

Smith's "Wealth of Nations" offers many insights other theories disagree. It argues that agriculture offers fewer possibilities to a division of labour, raising its prices compared with industry. [Us-American and European agriculture is therefore subsidised]. To Smith, the genius and the natural talents of men are no natural dispositions which have to be paid for according to comparative advantages. "It is not upon many occasions so much the cause, as the effect of the division of labour." Competition should reduce the prices of these "talents". Smith suspects manufacturers of mischief and trusts landowners and labourers – as consumers – to represent the common good. [Ricardo mistrusts landowners as earners of a monopoly income.]

Shortly before his death, Smith had nearly all his manuscripts destroyed. In his last years, he seemed to have been planning two major treatises, one on the theory and history of law and one on the sciences and arts. The posthumously published Essays on Philosophical Subjects, a history of astronomy down to Smith's own era, plus some thoughts on ancient physics and metaphysics, probably contain parts of what would have been the latter treatise. Lectures on Jurisprudence were notes taken from Smith's early lectures, plus an early draft of The Wealth of Nations, published as part of the 1976 Glasgow Edition of the works and correspondence of Smith. Other works, including some published posthumously, include Lectures on Justice, Police, Revenue, and Arms (1763) (first published in 1896); A Treatise on Public Opulence (1764) (first published in 1937); and Essays on Philosophical Subjects (1795).

The bicentennial anniversary of the publication of The Wealth of Nations was celebrated in 1976, resulting in increased interest for The Theory of Moral Sentiments and his other works throughout academia. After 1976, Smith was more likely to be represented as the author of both The Wealth of Nations and The Theory of Moral Sentiments, and thereby as the founder of a moral philosophy and the science of economics. His homo economicus or "economic man" was also more often represented as a moral person. Additionally, his opposition to slavery, colonialism, and empire was emphasized, as were his statements about high wages for the poor, and his views that a common street porter was not intellectually inferior to a philosopher.

Smith has been commemorated in the UK on banknotes printed by two different banks; his portrait has appeared since 1981 on the £50 notes issued by the Clydesdale Bank in Scotland, and in March 2007 Smith's image also appeared on the new series of £20 notes issued by the Bank of England, making him the first Scotsman to feature on an English banknote.

A large-scale memorial of Smith by Alexander Stoddart was unveiled on 4 July 2008 in Edinburgh. It is a 10 feet (3.0 m)-tall bronze sculpture and it stands above the Royal Mile outside St Giles' Cathedral in Parliament Square, near the Mercat cross. 20th century sculptor Jim Sanborn (best known for the Kryptos sculpture at the United States Central Intelligence Agency) has created multiple pieces which feature Smith's work. At Central Connecticut State University is Circulating Capital, a tall cylinder which features an extract from The Wealth of Nations on the lower half, and on the upper half, some of the same text but represented in binary code. At the University of North Carolina at Charlotte, outside the Belk College of Business Administration, is Adam Smith's Spinning Top. Another Smith sculpture is at Cleveland State University.

Smith has been celebrated by advocates of free market policies as the founder of free market economics, a view reflected in the naming of bodies such as the Adam Smith Institute, Adam Smith Society and the Australian Adam Smith Club, and in terms such as the Adam Smith necktie.

Alan Greenspan argues that, while Smith did not coin the term laissez-faire, "it was left to Adam Smith to identify the more general set of principles that brought conceptual clarity to the seeming chaos of market transactions". Greenspan continues that The Wealth of Nations was "one of the great achievements in human intellectual history". P.J. O'Rourke describes Smith as the "founder of free market economics". However, other writers have argued that Smith's support for laissez-faire (which in French means leave alone) has been overstated. Herbert Stein wrote that the people who "wear an Adam Smith necktie" do it to "make a statement of their devotion to the idea of free markets and limited government", and that this misrepresents Smith's ideas. Stein writes that Smith "was not pure or doctrinaire about this idea. He viewed government intervention in the market with great skepticism ... yet he was prepared to accept or propose qualifications to that policy in the specific cases where he judged that their net effect would be beneficial and would not undermine the basically free character of the system. He did not wear the Adam Smith necktie." In Stein's reading, The Wealth of Nations could justify the Food and Drug Administration, the Consumer Product Safety Commission, mandatory employer health benefits, environmentalism, and "discriminatory taxation to deter improper or luxurious behavior".

Similarly, Vivienne Brown stated in The Economic Journal that in the 20th century United States, Reaganomics supporters, The Wall Street Journal, and other similar sources have spread among the general public a partial and misleading vision of Smith, portraying him as an "extreme dogmatic defender of laissez-faire capitalism and supply side economics". In fact, The Wealth of Nations includes the following statement on the payment of taxes:

"The subjects of every state ought to contribute towards the support of the government, as nearly as possible, in proportion to their respective abilities; that is, in proportion to the revenue which they respectively enjoy under the protection of the state."

Moreover, in this passage Smith goes on to specify progressive, not flat, taxation:

"The rich should contribute to the public expense, not only in proportion to their revenue, but something more than in that proportion"

Smith even specifically named taxes that he thought should be required by the state among them luxury goods taxes and tax on rent. He believed that tax laws should be as transparent as possible and that each individual should pay a "certain amount, and not arbitrary," in addition to paying this tax at the time "most likely to be convenient for the contributor to pay it". Smith goes on to state that:

"Every tax, however, is, to the person who pays it, a badge, not of slavery, but of liberty."

Additionally, Smith outlined the proper expenses of the government in The Wealth of Nations, Book V, Ch. I. Included in his requirements of a government is to enforce contracts and provide justice system, grant patents and copy rights, provide public goods such as infrastructure, provide national defense and regulate banking. It was the role of the government to provide goods "of such a nature that the profit could never repay the expense to any individual" such as roads, bridges, canals, and harbours. He also encouraged invention and new ideas through his patent enforcement and support of infant industry monopolies. He supported public education and religious institutions as providing general benefit to the society. Finally he outlined how the government should support the dignity of the monarch or chief magistrate, such that they are equal or above the public in fashion. He even states that monarchs should be provided for in a greater fashion than magistrates of a republic because "we naturally expect more splendor in the court of a king than in the mansion house of a doge." In addition, he was in favor of retaliatory tariffs and believed that they would eventually bring down the price of goods. He even stated in Wealth of Nations:

"The recovery of a great foreign market will generally more than compensate the transitory inconvenience of paying dearer during a short time for some sorts of goods."

Noam Chomsky has argued that several aspects of Smith's thought have been misrepresented and falsified by contemporary ideology, including Smith's reasons for supporting markets and Smith's views on corporations. Chomsky argues that Smith supported markets in the belief that they would lead to equality, and that Smith opposed wage labor and corporations. Economic historians such as Jacob Viner regard Smith as a strong advocate of free markets and limited government (what Smith called "natural liberty") but not as a dogmatic supporter of laissez-faire.

Economist Daniel Klein believes using the term "free market economics" or "free market economist" to identify the ideas of Smith is too general and slightly misleading. Klein offers six characteristics central to the identity of Smith's economic thought and argues that a new name is needed to give a more accurate depiction of the "Smithian" identity. Economist David Ricardo set straight some of the misunderstandings about Smith's thoughts on free market. Most people still fall victim to the thinking that Smith was a free market economist without exception, though he was not. Ricardo pointed out that Smith was in support of helping infant industries. Smith believed that the government should subsidise newly formed industry, but he did fear that when the infant industry grew into adulthood it would be unwilling to surrender the government help. Smith also supported tariffs on imported goods to counteract an internal tax on the same good. Smith also fell to pressure in supporting some tariffs in support for national defense.