Picture the pantheon of classical economics. Adam Smith sits at the centre, David Ricardo stands nearby, Jean-Baptiste Say holds a modest plaque. Somewhere in the back, if he appears at all, you will find James Mill (1773–1836) — Scottish philosopher, historian, journalist, and the man the economist José Mauricio Gómez Julián argues we have been unjustly forgetting for nearly two centuries. In a concise but provocative article published in Economía & Región, Gómez Julián builds a meticulous case: Mill was not merely Ricardo’s friend and editor. He was, in several crucial respects, the intellectual architect behind ideas we now attribute to others — and the quiet originator of concepts that still animate central bank boardrooms today.

What follows is a guided walk through that argument. No equations, no jargon — just the story of a mind that anticipated, with striking clarity, debates we are still having in the twenty-first century.

I. The Law That Was Never Say’s

If you have taken even a single semester of macroeconomics, you have encountered Say’s Law — the proposition that “supply creates its own demand.” It is one of the most cited principles in the history of the discipline, and it is routinely attributed to the French economist Jean-Baptiste Say.

Gómez Julián’s article asks a simple, uncomfortable question: did Say actually come up with it first?

The evidence points elsewhere. In 1807, an English writer named William Spencer published an argument containing the essential logic: that the annual produce of a country “always creates a market to itself,” and that when commodities seem to exceed demand, the real problem is merely a misallocation of productive effort among sectors, not a general glut. James Mill seized on this reasoning in his 1808 work Commerce Defended, presenting it with considerably more force and theoretical precision.

Three years later, in his 1821 Elements of Political Economy — the book Gómez Julián calls Mill’s “magnus opus” — Mill refined the idea further, embedding it in a broader theory of how supply, demand, and production costs interact over time. His formulation is careful and layered: relative prices are determined in the first instance by supply and demand, but ultimately by cost of production, because competition relentlessly pushes markets toward equilibrium.

The article’s charge is direct: Say popularised an idea that was already circulating in English-language economics, and the discipline’s later canonisation of “Say’s Law” obscured its true origin. Gómez Julián does not mince words — he uses the term “plagiarism” (or rather, the article calls it “the least known plagiarism of the Classical Economists”).

Whether one accepts that strong characterisation or prefers a milder framing of “parallel development,” the underlying historical point stands: Mill was articulating this foundational principle at least as early as Say, and arguably with greater analytical sophistication.

II. Money, Prices, and the Seeds of Central Banking

Here is where Mill’s contribution moves from historical curiosity to genuine intellectual substance. Gómez Julián argues that Mill was one of the finest exponents of the Quantity Theory of Money in his era — and, crucially, that he did so without falling into the contradictions that plagued later economists.

The Quantity Theory, in its simplest form, says that the total amount of money in circulation determines the general level of prices. Mill stated it with remarkable directness:

But the real surprise, for anyone accustomed to thinking of classical economists as rigid free-market purists, is what Mill argued next. He described two distinct circumstances under which a government might create money: first, by allowing it to “float freely” in the channels of circulation (essentially, an open mint where citizens bring bullion to be coined); and second, when the government wishes to control the quantity of money at its discretion.

This is a startlingly modern framing. Unlike his friend David Ricardo, who frequently questioned any form of government monetary intervention, Mill was willing — even eager — to theorise about deliberate monetary management. He proposed that if the government wanted less money in circulation, it should raise the metallic value of the coinage (making each coin worth more); if it wanted more, it should lower it. The mechanism differs from modern interest-rate policy, of course, but the underlying logic — that a central authority should actively calibrate the money supply to achieve macroeconomic goals — is recognisably the ancestor of what every central bank does today.

III. Trade Without Illusions

Ricardo’s theory of comparative advantage is one of the most celebrated ideas in all of economics. Gómez Julián notes, however, that James Mill saw international trade through a rather different and more pragmatic lens.

For Mill, the relationship between nations was essentially the same as the relationship between individual merchants: buy in the cheapest market, sell in the most expensive. He did not need the elaborate logical apparatus of comparative advantage to explain why trade was beneficial. The article suggests that Ricardo’s theory, far from being the inevitable culmination of classical trade thinking, was in some sense a detour — and that Mill’s simpler framework was closer to how commerce actually works.

Moreover, Mill was one of the first economists to recognise that currency devaluation could be used as a tool for international competitiveness. The idea that a nation might deliberately weaken its exchange rate to boost exports is a staple of modern policy debates; Gómez Julián traces the logic back to Mill’s Elements.

IV. Productive Labour, Unproductive Labour, and the Nature of Capital

Adam Smith famously distinguished between “productive” and “unproductive” labour — a tailor makes something tangible, a servant does not. But Gómez Julián argues that Mill was the first economist to define these categories with genuine clarity, going beyond Smith’s somewhat impressionistic treatment.

Mill also drew a related distinction between productive consumption and unproductive consumption — the idea that some spending builds future capacity while other spending merely satisfies immediate desires. Karl Marx, who read Mill carefully, admired the precision with which Mill laid out these ideas. In his 1844 Comments on James Mill, Marx praised the exposition with what he called Mill’s “customary cynical acumen and clarity.” It is an extraordinary compliment from a thinker not known for flattery.

On the question of capital, Mill made further contributions that have been overlooked. He was among the first — alongside the lesser-known Samuel Bailey — to discuss capital accumulation in depth: specifically, what happens to industrial capital’s effects when the total amount of capital remains constant. Gómez Julián notes, fairly, that Mill made an error here (treating the portion of capital invested in labour-power as fixed), but the discussion itself was pioneering.

Mill also drew a sharp conceptual line between the circulation medium used as capital (money deployed for productive investment) and the circulation medium used as a simple medium of exchange (money used for everyday purchases). Marx would later build extensively on this distinction in his own economic writings.

V. Population, Egoism, and the Architecture of Political Economy

Thomas Malthus is remembered for his theory that population tends to outstrip the food supply. Mill offered a strikingly different perspective: population density is ultimately determined by the needs of capital, not by any abstract biological tendency toward over-reproduction. In a single sentence, Mill redirected the population question from biology to political economy — a reorientation with implications that echo through later Marxist and institutional economics.

On the question of self-interest, Gómez Julián argues that Mill’s treatment of egoism, private property, and production was clearer and deeper than Adam Smith’s in The Theory of Moral Sentiments. Marx summarised Mill’s position in a single lapidary phrase: “The limit of his need constitutes the limit of his production.”

And then there is the matter of Mill’s intellectual architecture. His Elements of Political Economy is organised into four books:

1. Production — how wealth is created.
2. Distribution — how wealth is divided among social classes.
3. Exchange — how commodities trade for one another, and the role of money.
4. Consumption — how wealth is used, and under what conditions it expands or contracts.

This four-part structure, elegantly simple, became the template for generations of economics textbooks. John Stuart Mill’s own celebrated Principles of Political Economy (1848) follows essentially the same outline — not a coincidence, given that James was his father and tutor.

VI. The Teacher’s Shadow

The final dimension of Mill’s influence is indirect but enormous. John Maynard Keynes, in The General Theory of Employment, Interest and Money, wrote that “‘classical economists’ was a name invented by Marx to refer to Ricardo, James Mill, and their predecessors — that is, to the founders of the theory that culminated with Ricardo.” Notice: Keynes lists James Mill first, before Ricardo.

Beyond his own published work, Mill shaped the discipline through personal influence. He was David Ricardo’s closest intellectual confidant, his editorial advisor, and — as Gómez Julián emphasises — one of the principal mentors who encouraged Ricardo to write his masterwork. Sraffa’s monumental edition of Ricardo’s Works and Correspondence documents the extent of this influence, and Donald Winch’s Selected Economic Writings further confirms it.

And of course, there is John Stuart Mill, arguably the most influential economist of the mid-nineteenth century, who received his entire early education from his father. Karl Marx, commenting acidly on the younger Mill’s monetary theories, observed that John Stuart had “his customary eclectic logic to embrace his father’s soup and at the same time the opposite” — a backhanded compliment to both Mills that inadvertently testifies to how deeply James Mill’s ideas had penetrated the discipline.

A Final Thought

History is written by the remembered. In economics, as in most fields, the canon narrows with each generation: a handful of names survive, and the rest fade into footnotes. Gómez Julián’s article is a reminder that those footnotes sometimes conceal ideas of startling originality and enduring relevance.

James Mill may never have the name recognition of Adam Smith or John Maynard Keynes. But the next time you hear a central banker discuss money supply management, or a trade minister talk about exchange-rate strategy, or an economist invoke the idea that supply and demand are two sides of the same coin — spare a thought for the Scottish philosopher who got there first, and whose influence is still hiding in plain sight.

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