The Wealth of Nations

Adam Smith's 1776 book is famous for two ideas — the pin factory and the invisible hand — and constantly misread on a third.

Adam Smith published An Inquiry into the Nature and Causes of the Wealth of Nations in March 1776, four months before the American Declaration of Independence. He had spent more than a decade writing it. He was not, by trade, an economist; the discipline didn't really exist. He was a Scottish moral philosopher, and he meant the book as the second half of a project that had begun seventeen years earlier with The Theory of Moral Sentiments. Together the two volumes were supposed to describe how a society could be at once prosperous and decent.

The book is long, digressive, and full of eighteenth-century price tables. Most of what people remember is contained in two early chapters and one phrase. It is worth knowing what those passages actually argue, because almost everyone gets the third one wrong.

What “wealth” is, and isn't

Smith's first move is rhetorical, but it changes everything. The reigning doctrine of his time was mercantilism: a nation's wealth is the gold and silver in its sovereign's vaults, and the goal of policy is to run a trade surplus so that more bullion flows in than out. Smith rejects this on the first page. The wealth of a nation, he says, is its annual produce — the food, cloth, tools, ships, books, and services that its labour can supply. Money is just a way of moving these things around. A king with a vault full of silver and an empty country is poor.

This sounds obvious now. It was not obvious then. Reframing wealth as annual flow rather than stored treasure is what allows the rest of the book to make sense, and it is also what allows Smith to ask a different question from the one his contemporaries were asking. Not how does the sovereign accumulate? but why does the productive power of labour vary so wildly between nations, and what makes it grow?

The pin factory

Smith's answer begins, famously, in a pin factory. A single craftsman, working alone, could perhaps make a pin or two in a day — and not very good ones. But Smith had seen a small workshop where the trade was divided into about eighteen distinct operations: drawing the wire, straightening it, cutting it, pointing it, grinding the top to take a head, making the head, attaching it, whitening the finished pin, papering them up. Ten workers, each specialised, produced upwards of forty-eight thousand pins a day. Per worker, that is roughly four thousand pins. Without the division of labour, the same ten people could not have made twenty between them.

Smith identifies three reasons. The worker who does one motion all day acquires uncanny dexterity. No time is lost moving between tools or stations. And, most importantly, simplifying each operation makes it obvious which steps could be done by a machine — so machines get invented for them. Specialisation, he argues, is the engine of mechanisation, not the other way round.

This leads to one of the most quietly important sentences in the whole book: the division of labour is limited by the extent of the market. A village can support a butcher; only a city can support a butcher who specialises in lamb. Bigger markets — through better roads, navigable rivers, peace, free trade — allow finer specialisation, which raises productivity, which raises wealth. Growth is not magic. It is geometry.

The invisible hand

Once people specialise, they have to trade. Smith's account of how is the part of the book that everyone half-remembers and half-misquotes. The famous passage is in Book I:

“It is not from the benevolence of the butcher, the brewer, or the baker, that we expect our dinner, but from their regard to their own interest.”

The point is not that selfishness is good. The point is that a working market does not require everyone to love everyone else. The butcher need not care about you; he needs to want your money. You need not care about him; you need to want his meat. The transaction works because each side serves the other as a side-effect of pursuing its own ends. Society scales precisely because it does not depend on universal benevolence, which does not scale.

The phrase invisible hand appears exactly once in Wealth of Nations, much later, in Book IV. Smith uses it almost in passing. A merchant who chooses to invest in domestic rather than foreign industry, he says, is intending only his own gain, and is “led by an invisible hand to promote an end which was no part of his intention.” That's it. One sentence. He is not making a metaphysical claim about markets always producing the best of all possible worlds. He is making a narrow point about how local self-interest can, in the right conditions, aggregate into public good.

What Smith actually feared

This is the part that gets dropped from the bumper-sticker version of Smith. He was deeply suspicious of merchants and manufacturers as a political class. He thought they would, given any opportunity, conspire against the public interest. The line is worth quoting at length, because it is the temperature of the whole book:

“People of the same trade seldom meet together, even for merriment and diversion, but the conversation ends in a conspiracy against the public, or in some contrivance to raise prices.”

Smith's enemy was not government as such. It was the alliance between government and monopolists: the chartered companies, the protected guilds, the import bans procured by domestic producers, the colonies run for the benefit of metropolitan merchants at the expense of everyone else. He wanted markets to be competitive precisely so that no individual seller could dictate terms. He supported public works that the market would not provide on its own — roads, canals, harbours. He argued for universal basic education, partly because he thought the division of labour, left unchecked, would deaden the minds of the workers it enriched. He thought taxation should fall most heavily on rents, which he regarded as unearned. He wanted regulation against fraud, against fractional banking gone reckless, against the kinds of contract that exploit one side's ignorance.

The cartoon version of Wealth of Nations is that markets are magic and government is meddling. Smith's actual view is more careful and more interesting: that competition under just laws is one of the most powerful instruments humanity has ever found for converting individual self-interest into collective prosperity, and that almost everything that goes wrong with it — monopoly, capture, collusion, immiseration of workers — comes from the same place: people who already have power using it to insulate themselves from competition. The question is never market or state? It is, always, which institutions actually keep competition honest?

Two and a half centuries later, that is still the question.