Economics and Philosophy
In 1772, the Scottish economist Adam Smith posed a puzzle so simple it seems almost rude. Water, he observed, is essential to life. A diamond is not. Yet diamonds command fortunes while water, in his day, was essentially free. Something was wrong with the accounting.
Smith called it the paradox of value. It has never entirely gone away.
The question matters far beyond the jewelry counter. Every time a hospital triage team decides who receives the last available bed, every time a government sets a carbon price, every time a parent chooses between two schools for a child, the paradox resurfaces in a new costume. What something costs and what it is worth are not the same thing — and the gap between them is where most of the interesting decisions in human life actually happen.
The Resolution That Didn't Quite Resolve#
For a century after Smith, economists struggled with his puzzle. The answer, when it came in the 1870s, was elegant: value is determined not by total usefulness but by marginal usefulness — the utility of one more unit. Water is abundant; the value of one more glass of it, to someone who already has enough, is low. Diamonds are scarce; the value of one more, to someone who wants one, is high.
This theory — marginal utility — solved Smith's paradox arithmetically. It also, quietly, changed the subject. By anchoring value to what a willing buyer would pay a willing seller at the margin, economics transformed value into price. The two words are still used interchangeably in casual speech. They should not be.
Price is an exchange ratio. It records what happened when supply met demand. Value is something else — a claim about importance, about what something is worth, that need not coincide with what anyone will pay. A letter from a dead parent has enormous value and no market price. Clean air in a congested city has enormous value and, in the absence of regulation, a price of zero. The slaves traded across the Atlantic had market prices. No serious person now believes those prices captured anything meaningful about their worth.
The Cost of Confusing the Two#
When value and price are treated as synonyms, the errors tend to be expensive.
Consider environmental accounting. For most of the twentieth century, a factory that discharged waste into a river was recording no cost — the river had no price. The fish that died, the children who could not swim, the communities downstream whose water turned brackish: none of these appeared on any balance sheet. They were what economists call externalities, which is a technical term for costs that someone else pays.
The global carbon market is an attempt to correct exactly this error — to assign a price to something (atmospheric stability) that has enormous value but no natural market. The attempt has been only partly successful, largely because there is no agreement on what the value actually is. When the UK government's Stern Review in 2006 estimated the cost of unchecked climate change at 5 to 20 percent of global GDP annually, and some economists replied that those estimates were too high because future generations would be richer and could bear the cost themselves, the argument was not really about economics. It was about whether the welfare of future people deserves the same weight as the welfare of present people. That is a question about value. Economics can model the implications of different answers but cannot supply the answer itself.
What Philosophy Adds — and What It Cannot Settle#
Philosophers have worried about the objectivity of value for as long as there have been philosophers. The central dispute is whether value is a feature of the world — something objects actually have, independently of what anyone thinks or feels — or whether it is a projection of human attitudes onto a neutral world.
The stakes are higher than they sound. If value is objective, then disagreements about value are like disagreements about geography: there is a fact of the matter, and someone is wrong. If value is subjective — merely a preference, a cultural habit, a neural response — then disagreements about value are more like disagreements about flavor: legitimate, irresolvable, and no one's business but your own.
Most educated people oscillate between these positions without noticing. They treat their own deepest values — the impermissibility of torturing children, the importance of honesty, the wrongness of betrayal — as objective facts about the world. They treat other people's deep values — particularly political or religious ones — as mere preferences, historically contingent, culturally constructed, not binding on anyone who does not share the culture. This asymmetry is philosophically unstable. It is also extremely common.
One sophisticated resolution — developed by philosophers Christine Tappolet and Mauro Rossi — argues that emotions provide perceptual access to evaluative properties that actually exist in the world. The feeling of admiration, on this view, is not merely a subjective response; it is a way of perceiving that something genuinely is admirable. Emotions are instruments of evaluative knowledge, not distortions of it. This position, called sentimental realism, threads between the extremes: value is real, but we access it through feeling rather than pure reason.
The argument will reappear in Article 5. For now, note that it implies something practically important: that dismissing emotional responses to value questions as irrational is not just psychologically difficult — it may be epistemically wrong.
The Diamond and the Water, Revisited#
Smith's paradox has a modern heir that is, if anything, more uncomfortable. In organ transplant medicine, the question of what a kidney is worth is not theoretical. Thousands of people die each year waiting for kidneys that exist — on living donors who would surrender them for money, if money were permitted, which in most countries it is not. Iran is the only country that operates a legal market in kidneys. Everywhere else, the organ's value is treated as categorically different from its price.
The prohibition is widely supported and poorly theorized. The usual argument — that permitting payment degrades the transaction, turning a gift into a commodity — is a claim about value, not economics. It asserts that some things lose something important when they acquire a price: not utility, not even worth, but a kind of moral quality that market exchange destroys. Philosophers call this the corruption argument. It is unproven and very possibly true.
What the organ market debate illustrates is that the gap between price and value is not merely an accounting error to be corrected by better regulation. It reflects a deep feature of human moral life: the intuition that not everything important can or should be made commensurable with everything else. Some values resist reduction to a common scale. When markets ignore this, the results tend to be both economically efficient and humanly wrong.
Smith identified the paradox. Two and a half centuries of economics and philosophy have refined it. They have not dissolved it. The distance between what something costs and what it is worth remains the most interesting gap in human thought — and the one with the most immediate practical consequences.
Next in the series: Article 2 — Your Brain Has a Spreadsheet
