Of those who built upon John Locke’s labor-desert theory of property and his theory of money and its social impacts, the best-known are probably Adam Smith in the 18th Century and Karl Marx in the 19th. Both are often misunderstood, and both have had their works and names used for causes they would have opposed, and many more talk about what they said than actually read what they wrote. 

In Adam Smith’s case, most of this has to do with his idea of an “invisible hand,” which refers to the self-regulation of markets through free competition and commerce. Smith used the term only three times in his published work, and the eventual ends and purposes that it’s supposed to serve are not entirely in keeping with the way it is typically invoked.

Of the three, the one that is most famous is in Wealth of Nations, but the one that’s most substantial is in the other of his two major works, The Theory of Moral SentimentsLinks to an external site..

In Wealth of Nations, the term is used regarding domestic and international commerce:

By preferring the support of domestick to that of foreign industry, he intends only his own security; and by directing that industry in such a manner as its produce may be of the greatest value, he intends only his own gain, and he is in this, as in many other cases, led by an invisible hand to promote an end which was no part of his intention. Nor is it always the worse for the society that it was no part of it. By pursuing his own interest he frequently promotes that of the society more effectually than when he really intends to promote it. I have never known much good done by those who affected to trade for the publick good. It is an affectation, indeed, not very common among merchants, and very few words need be employed in dissuading them from it.

It’s brief and not necessarily generalizable, but this is the version that has been built upon. 

The “invisible hand” in The Theory of Moral Sentiments is not so vaguely directed toward “the publick good” but is specifically about how our limited capacity for consumption, whether we are wealthy or poor, naturally redirects the selfishness and greed of the rich and powerful toward benefitting the poor, and he thinks that a properly functioning economy should convert the unjust and uncaring search for ever more wealth into a means to meet the basic needs of every member of society, no matter how destitute. 

Here’s the relevant passage in its context, slightly excerpted for length and with emphasis added for convenience:

The poor man’s son, whom heaven in its anger has visited with ambition, when he begins to look around him, admires the condition of the rich. He finds the cottage of his father too small for his accommodation, and fancies he should be lodged more at his ease in a palace. He is displeased with being obliged to walk a-foot, or to endure the fatigue of riding on horseback. […] He feels himself naturally indolent, and willing to serve himself with his own hands as little as possible; and judges, that a numerous retinue of servants would save him from a great deal of trouble. He thinks if he had attained all these, he would sit still contentedly, and be quiet, enjoying himself in the thought of the happiness and tranquillity of his situation. He is enchanted with the distant idea of this felicity. It appears in his fancy like the life of some superior rank of beings, and, in order to arrive at it, he devotes himself for ever to the pursuit of wealth and greatness. To obtain the conveniencies which these afford, he submits in the first year, nay in the first month of his application, to more fatigue of body and more uneasiness of mind than he could have suffered through the whole of his life from the want of them. He studies to distinguish himself in some laborious profession. With the most unrelenting industry he labours night and day to acquire talents superior to all his competitors. He endeavours next to bring those talents into public view, and with equal assiduity solicits every opportunity of employment. For this purpose he makes his court to all mankind; he serves those whom he hates, and is obsequious to those whom he despises. Through the whole of his life he pursues the idea of a certain artificial and elegant repose which he may never arrive at, for which he sacrifices a real tranquillity that is at all times in his power, and which, if in the extremity of old age he should at last attain to it, he will find to be in no respect preferable to that humble security and contentment which he had abandoned for it. It is then, in the last dregs of life, his body wasted with toil and diseases, his mind galled and ruffled by the memory of a thousand injuries and disappointments which he imagines he has met with from the injustice of his enemies, or from the perfidy and ingratitude of his friends, that he begins at last to find that wealth and greatness are mere trinkets of frivolous utility […]. [I]n the languor of disease and the weariness of old age, the pleasures of the vain and empty distinctions of greatness disappear. To one, in this situation, they are no longer capable of recommending those toilsome pursuits in which they had formerly engaged him. In his heart he curses ambition, and vainly regrets the ease and the indolence of youth, pleasures which are fled for ever, and which he has foolishly sacrificed for what, when he has got it, can afford him no real satisfaction. In this miserable aspect does greatness appear to every man when reduced either by spleen or disease to observe with attention his own situation, and to consider what it is that is really wanting to his happiness. Power and riches appear then to be, what they are, enormous and operose machines contrived to produce a few trifling conveniencies to the body, consisting of springs the most nice and delicate, which must be kept in order with the most anxious attention, and which in spite of all our care are ready every moment to burst into pieces, and to crush in their ruins their unfortunate possessor. They are immense fabrics, which it requires the labour of a life to raise, which threaten every moment to overwhelm the person that dwells in them, and which while they stand, though they may save him from some smaller inconveniencies, can protect him from none of the severer inclemencies of the season. They keep off the summer shower, not the winter storm, but leave him always as much, and sometimes more exposed than before, to anxiety, to fear, and to sorrow; to diseases, to danger, and to death.

But though this splenetic philosophy, which in time of sickness or low spirits is familiar to every man, thus entirely depreciates those great objects of human desire, when in better health and in better humour, we never fail to regard them under a more agreeable aspect. Our imagination, which in pain and sorrow seems to be confined and cooped up within our own persons, in times of ease and prosperity expands itself to every thing around us. We are then charmed with the beauty of that accommodation which reigns in the palaces and oeconomy of the great; and admire how every thing is adapted to promote their ease, to prevent their wants, to gratify their wishes, and to amuse and entertain their most frivolous desires. If we consider the real satisfaction which all these things are capable of affording, by itself and separated from the beauty of that arrangement which is fitted to promote it, it will always appear in the highest degree contemptible and trifling. But we rarely view it in this abstract and philosophical light. We naturally confound it in our imagination with the order, the regular and harmonious movement of the system, the machine or oeconomy by means of which it is produced. The pleasures of wealth and greatness, when considered in this complex view, strike the imagination as something grand and beautiful and noble, of which the attainment is well worth all the toil and anxiety which we are so apt to bestow upon it.

And it is well that nature imposes upon us in this manner. It is this deception which rouses and keeps in continual motion the industry of mankind. It is this which first prompted them to cultivate the ground, to build houses, to found cities and commonwealths, and to invent and improve all the sciences and arts, which ennoble and embellish human life; which have entirely changed the whole face of the globe, have turned the rude forests of nature into agreeable and fertile plains, and made the trackless and barren ocean a new fund of subsistence, and the great high road of communication to the different nations of the earth. The earth by these labours of mankind has been obliged to redouble her natural fertility, and to maintain a greater multitude of inhabitants. It is to no purpose, that the proud and unfeeling landlord views his extensive fields, and without a thought for the wants of his brethren, in imagination consumes himself the whole harvest that grows upon them. The homely and vulgar proverb, that the eye is larger than the belly, never was more fully verified than with regard to him. The capacity of his stomach bears no proportion to the immensity of his desires, and will receive no more than that of the meanest peasant. The rest he is obliged to distribute among those, who prepare, in the nicest manner, that little which he himself makes use of, among those who fit up the palace in which this little is to be consumed, among those who provide and keep in order all the different baubles and trinkets, which are employed in the oeconomy of greatness; all of whom thus derive from his luxury and caprice, that share of the necessaries of life, which they would in vain have expected from his humanity or his justice. The produce of the soil maintains at all times nearly that number of inhabitants which it is capable of maintaining. The rich only select from the heap what is most precious and agreeable. They consume little more than the poor, and in spite of their natural selfishness and rapacity, though they mean only their own conveniency, though the sole end which they propose from the labours of all the thousands whom they employ, be the gratification of their own vain and insatiable desires, they divide with the poor the produce of all their improvements. They are led by an invisible hand to make nearly the same distribution of the necessaries of life, which would have been made, had the earth been divided into equal portions among all its inhabitants, and thus without intending it, without knowing it, advance the interest of the society, and afford means to the multiplication of the species. When Providence divided the earth among a few lordly masters, it neither forgot nor abandoned those who seemed to have been left out in the partition. These last too enjoy their share of all that it produces. In what constitutes the real happiness of human life, they are in no respect inferior to those who would seem so much above them. In ease of body and peace of mind, all the different ranks of life are nearly upon a level, and the beggar, who suns himself by the side of the highway, possesses that security which kings are fighting for.