I had the AI program Claude write this dialogue. The image was generated by Grok.
Thomas Aquinas was a 13th century philosopher and theologian. He wrote about this concept in his work Summa Theologiae.
After the discussion there are links with background on this concept.
AQUINAS: Master Smith, I understand you have made a study of trade and exchange, as I once did in my own small way, though from a different chair entirely. Let me begin, then, with a notion I labored over in my Summa — that of the justum pretium, the just price.
SMITH: I would be glad to hear it stated plainly, Brother Thomas, in your own terms before I offer mine.
AQUINAS: Very well. When men exchange goods, it is not enough that an exchange merely occur. An exchange, to be virtuous, must be just — and justice, as I understand it after Aristotle, is a kind of equality maintained between persons. If I sell you a horse, the price I ask ought to correspond to the true worth of the horse itself, not to whatever advantage I might extract from your need, your ignorance, or your desperation. To sell a thing for more than it is worth, knowing the buyer is deceived or compelled, is a species of fraud, even if no lie is spoken aloud.
SMITH: And how, Brother Thomas, is this "true worth" to be discovered? By what measure?
AQUINAS: By the common estimation of the community — what a thing is reckoned to be worth among honest men, given its usefulness and the labor and cost involved in producing and bringing it to market. This is not a fixed number handed down from heaven, mind you. It allows for some variation, and for the seller's reasonable profit, and even for differences of place and season. But it has bounds. A merchant who, finding a city in famine, raises his grain price tenfold not because his costs have risen but because he perceives the buyer has no choice — that merchant sins, even though the buyer freely hands over his coin. The will of the seller to exploit a neighbor's necessity corrupts the exchange, whatever the law of the marketplace might permit.
SMITH: I see the shape of it now. And your appraisal of the doctrine — for I sense you hold reservations even as its architect?
AQUINAS: I do. I set it down as a moral limit on the will of the trader — a check upon avarice, upon the sin I called turpe lucrum, shameful gain. My purpose was pastoral before it was economic: I wished confessors to have something to say to the merchant who came to them uneasy in conscience, wondering whether his profit had been honestly won. But I confess the doctrine strains when I try to apply it with any precision. Who, exactly, sets the "common estimation"? I gesture toward the custom of the marketplace, yet custom itself shifts with scarcity and abundance, and I never furnished a method for weighing labor against usefulness against station. I built a moral compass, Master Smith, not a scale. It points toward fairness but does not measure it.
SMITH: That is honestly said. Shall I offer my own view, then, built as it is on rather different foundations?
AQUINAS: Please.
SMITH: Where you began with justice and the good of the soul, I began with observation — with watching how men in butcher shops and wool markets and shipping ports actually arrive at the prices they pay. And what I found is that price is not, in the main, a moral judgment rendered by the community upon a good's inherent worth. It is the resultant of a kind of natural mechanism. Every commodity has what I called its natural price — that sum which just suffices to pay the rent of the land, the wages of the labor, and the profits of the stock employed in bringing it to market, each at their ordinary rate. But the price actually paid on any given day, the market price, dances above and below that natural price according to the balance of what is offered for sale against what buyers are willing to purchase. Scarcity raises it; glut lowers it. And crucially — this dance is not vicious. It is the very mechanism by which the right quantity of grain, of wool, of nails, comes to be produced and delivered where it is wanted.
AQUINAS: Then you would absolve the merchant of Bologna, who trebled his bread price the week the harvest failed?
SMITH: Not absolve him of unkindness, perhaps, but I would hesitate to call him unjust in the sense you mean. Consider what that high price accomplishes. It signals, more effectively than any town crier, that bread is scarce and must be economized. It induces the hoarder to release his stores rather than wait, since profit is to be had now. And — this is the part I think your doctrine undervalues — it draws bread toward that city from other regions, from merchants elsewhere who see the high price and are moved by nothing loftier than self-interest to load their carts and hasten there. The high price is not merely the extraction of an unfair advantage. It is the very signal that summons relief.
AQUINAS: You describe an effect I do not dispute — I have seen the same, that dearth invites supply. But tell me, Master Smith, does the effect sanctify the intention? The merchant does not raise his price in order to summon relief for the city. He raises it because he perceives he may extract more coin from a starving man than a well-fed one. That the accidental consequence proves beneficial does not, in my accounting, cleanse the will that acted from a rather uglier motive.
SMITH: Ah, but here is where I would press you, Brother Thomas — and gently, for I do not think we are so far apart as we seem. I never claimed the butcher or the baker acts from benevolence. Indeed I have written that it is not from their benevolence that we expect our dinner, but from their regard to their own interest. My argument was never that self-interest is a virtue in the soul of the man who feels it. It is that a system may be arranged — through competition, through the freedom of many sellers to enter a market where profits run high — such that the private pursuit of gain is disciplined into public benefit, whatever the private motive. Your just price relies upon the individual conscience of the merchant, examined perhaps in the confessional. Mine relies upon the structure of the market itself, wherein a merchant's attempt to overcharge invites a rival merchant to undercut him, and the buyer is protected not by the seller's virtue but by the seller's competitor.
AQUINAS: That is an elegant mechanism, I grant you, where competitors are many and free to enter. But what of the case where they are not? Where one man controls the only well in a desert town, or where guild and custom bar a second baker from setting up his oven? Your discipline of competition requires precisely the condition my doctrine does not — a plurality of sellers each restrained by the other's presence. Remove that plurality, and what protects the buyer?
SMITH: I confess this is the case that troubles my own system most, and I have written with some heat against those very guilds and combinations you mention, and against monopolies granted by the state, for exactly this reason — that where competition is stifled, whether by conspiracy among tradesmen or by law, the natural check upon price fails, and the seller may indeed extract what your doctrine would call an unjust advantage. I do not think we disagree so much on the diagnosis of monopoly's evil. We differ, perhaps, on the remedy. You would appeal to the conscience of the monopolist himself, urging him toward moderation as a matter of sin. I would rather break the monopoly — by law where necessary, by encouraging entry where possible — so that his conscience need never be tested at all, since the temptation itself is removed.
AQUINAS: That is no small difference, Master Smith, but I think you have located it honestly. You place your trust in structures that render virtue less necessary. I place mine in the cultivation of virtue itself, believing that no structure, however well-arranged, can wholly substitute for the trader's own justice — for structures may be gamed by clever and wicked men faster than they can be built by wise ones.
SMITH: And I might answer that virtue, however admirable, is a frail reed to lean the whole weight of a nation's bread supply upon. I would rather assume men self-interested and arrange affairs so their self-interest serves their neighbor, than assume them virtuous and be surprised when they are not.
AQUINAS: Then perhaps our two counsels are not rivals but companions. Build your markets, Master Smith, and let competition do what it can. But do not imagine the structure absolves the man within it of the question I would still put to him at the last: did you deal with your brother as you would have him deal with you, or did you use his need as your instrument?
SMITH: I will grant you that question, Brother Thomas, and confess my science has no answer to it — only a hope that a well-ordered market makes the answer matter less often than it otherwise would.
AQUINAS: A modest hope. But I have built whole treatises on more modest ones than that.
The fire settles. Neither man moves to speak further, each content, for the moment, to have been understood rather than defeated.
For further reading:
What Is a Just Price? by By Paul Mueller with Jan Gerber.
On Fair Prices by Jon Murphy
Thomas Aquinas on the Just Price by Kishore Jayabalan
Adam Smith's Wealth of Nations: Always Contemporary by Michael Munger. This is long but it has some discussion of Aquinas as well
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