A classical economist’s case against agricultural tariffs and the Corn Laws
What the Work Is
On Protection to Agriculture is a political-economic pamphlet written by British economist David Ricardo, first published in 1822. The work addresses the Corn Laws—the system of tariffs and trade restrictions on imported grain that governed British agricultural policy—and argues against protectionist measures in favor of free trade. It stands as one of Ricardo’s significant policy-oriented writings, distinct from his more theoretical Principles of Political Economy and Taxation (1817), and represents his direct engagement with a pressing public policy debate of his era.
What the Book Is About
The pamphlet is fundamentally an argument against agricultural protectionism. Ricardo contends that the Corn Laws, which imposed tariffs on imported agricultural products, were economically harmful to Britain. His central thesis is that these protectionist measures forced the cultivation of less-productive domestic land, drove up rents, and redirected economic benefits away from the emerging industrial capitalist class and toward landowners. Ricardo argues that free trade in agriculture—specifically, allowing Britain to import grain freely—would benefit the nation as a whole by lowering food prices, reducing wages, and increasing profits available for investment and economic growth.
Key Ideas and Themes
The work develops several interconnected economic arguments rooted in Ricardo’s broader theoretical framework. Central to his case is the relationship between food prices, wages, and profits. Ricardo held that the price of food determines the price of necessaries, which in turn determines wages. When the Corn Laws kept grain prices artificially high, wages had to rise correspondingly, and since the revenue from manufactured goods is split between wages and profits, higher wages necessarily meant lower profits for capitalists. Reduced profits, in turn, diminished the incentive and capacity for capital investment, slowing economic growth.
Ricardo’s analysis of rent plays a crucial role in his argument. He defined rent as the difference between the produce obtained by employing equal quantities of capital and labour on land of varying quality. As population grows and demand for food increases, cultivation must extend to progressively poorer land. The more fertile land then yields a surplus over the poorer land, and landowners can charge rent for this advantage. The Corn Laws, by restricting imports, ensured that this process of extending cultivation to inferior land would continue, driving rents ever higher. Ricardo argued that these rising rents came at the expense of the nation’s economic profits—benefiting landlords while harming the broader economy.
A distinctive feature of Ricardo’s argument is his characterization of landlords’ economic role. He believed that landlords tended to squander their wealth on luxuries rather than invest productively. The Corn Laws, by channeling economic surplus toward landowners, thus directed resources away from the productive investment that would drive industrial growth. This was not merely an economic error but, in Ricardo’s view, a cause of national economic stagnation.
The pamphlet also reflects Ricardo’s conviction that free trade increases human well-being by making goods more affordable and more widely available. He envisioned Britain importing agricultural products while exporting manufactured goods—a specialization that would maximize the efficiency of the nation’s resources. This vision rested on his broader theory of comparative advantage, which held that nations benefit from concentrating their resources in industries where they have the greatest relative efficiency, even if they could produce other goods more cheaply than their trading partners.
Structure and Approach
As a policy pamphlet rather than a theoretical treatise, On Protection to Agriculture applies Ricardo’s established economic principles to a concrete legislative question. The work is argumentative and practical in orientation, seeking to influence contemporary debate over the Corn Laws rather than to advance new theoretical constructs. Ricardo writes as an economist engaging with public policy, using the analytical tools he had developed in his more systematic works to demonstrate the economic costs of protectionism. His approach is deductive, reasoning from general principles about rent, wages, and profits to specific conclusions about the effects of agricultural tariffs.
Significance and Influence
The pamphlet represents Ricardo’s direct intervention in one of the most consequential economic policy debates of early nineteenth-century Britain. As a Member of Parliament, Ricardo opposed the Corn Laws as barriers to economic growth, and this work gave intellectual expression to that opposition. His free trade views, though not immediately adopted, eventually became public policy in Britain—the Corn Laws were repealed in 1846, more than two decades after his death.
The work also illustrates the broader influence of Ricardian economics on subsequent economic thought. Ricardo’s analysis of the relationship between agricultural protection, rents, and profits informed later debates about trade policy and economic development. His argument that protectionism benefits landowners at the expense of industrial capitalists became a foundational element of classical liberal economic thinking about trade. The pamphlet stands as a notable example of how Ricardo’s theoretical economics—his theories of rent, wages, and profits—could be mobilized in service of concrete policy positions, demonstrating the practical relevance of classical political economy to the great public questions of its age.
Ricardo was born in London as the third surviving child of a successful stockbroker, Abraham Israel Ricardo, and his wife, Abigail. He came from a Sephardic Jewish family of Portuguese origin that had recently relocated from the Dutch Republic. At the age of 14, he began working with his father. At 21, he eloped with a Quaker, Priscilla Anne Wilkinson, and converted to Unitarianism against his father’s wishes, leading to estrangement from his family. His father disowned him, and his mother apparently never spoke to him again. Following this, he went into business for himself with the support of an eminent banking house, Lubbocks and Forster, and made the bulk of his fortune by profitably financing government borrowing.
Parliamentary Career and Political Stances
As MP for Portarlington, Ricardo voted with the opposition in support of liberal political movements in Naples and Sicily and for an inquiry into the administration of justice in Tobago. He voted for the repeal of the Blasphemous and Seditious Libels Act, for an inquiry into the Peterloo Massacre, and in 1821, for the abolition of the death penalty for forgery. He voted against the renewal of the sugar duties, objected to the higher duty on East Indian as opposed to West Indian produce, and opposed the timber duties. He voted silently for parliamentary reform and spoke in its favour at the Westminster anniversary reform dinner in 1822. He also voted for criminal law reform. He was an abolitionist, speaking at a meeting of the Court of the East India Company in March 1823, where he said he regarded slavery as a stain on the character of the nation.
Personal Life and Death
Ricardo and his wife Priscilla had eight children together, including Osman Ricardo, who later became an MP for Worcester, and David Ricardo, who became an MP for Stroud. He was a close friend of James Mill, and his other notable friends included Jeremy Bentham and Thomas Malthus, with whom he had a considerable debate over such things as the role of landowners in society. He was a member of Malthus’ Political Economy Club and the King of Clubs, and one of the original members of The Geological Society. Ten years after retiring and four years after entering Parliament, Ricardo died at 51 from an infection of the middle ear that spread into his brain and induced septicaemia. He is buried in an ornate grave in the churchyard of Saint Nicholas in Hardenhuish, Wiltshire. At the time of his death, his assets were estimated at £675,000–£775,000.
Banking and Monetary Policy
Ricardo wrote his first economics article at age 37, advocating for a reduction in the note-issuing of the Bank of England, and later published The High Price of Bullion, a Proof of the Depreciation of Bank Notes in 1810. He argued for a central bank, a cause taken up by his students, including John Stuart Mill. In his Plan for the Establishment of a National Bank (published posthumously in 1824), he argued for the autonomy of the central bank as the issuer of money. He proposed that a ratio of gold and Treasury bills, and a fixed claim against the government, would secure the central bank’s liquidity. In 1816, he stated that the Bank had the power to increase or reduce the circulation without any control, a power which he believed should be entrusted to neither the State itself nor anybody in it, as there could be no security for the uniformity in the value of the currency when its augmentation or diminution depends solely on the will of the issuers.
Value Theory
Ricardo worked to fix the issues he felt were most concerning with Adam Smith’s Labour Theory of Value. He believed that with production having three factors—land, labour, and capital—it is impossible for only one of them to determine value on its own. He illustrated his point by adapting Smith’s deer-beaver analogy to show that even when labour is the only factor of production, the hardship and tools of the labour will drive a wedge in the relative value of the good. In his most famous work, Principles of Political Economy and Taxation (1817), he advanced a labour theory of value, stating that the value of a commodity depends on the relative quantity of labour which is necessary for its production, and not on the greater or less compensation which is paid for that labour. Due to his criticisms of the Labour Theory of Value, George Stigler called his theory a “93% labor theory of value”.
Rent Theory
Ricardo defined rent as “the difference between the produce obtained by the employment of two equal quantities of capital and labour.” He believed that the process of economic development, which increased land use and eventually led to the cultivation of poorer land, principally benefited landowners. He postulated that rent is a result of increased populations which results in assets growing scarce. He illustrated this by supposing there are three fields of land to yield corn with an equal employment of capital and labour. Initially, land No. 1 is cultivated and is very productive, but over time this surplus becomes diminished as the result of an increase in population, which creates an increased demand for food. The less desired land, No. 2, must then be cultivated, and eventually so must land No. 3. Each new cultivation results in diminished surplus as the quality of land fails to yield the equal of that before it, and landowners see opportunities to charge rent as a means to compensate for the loss of returns on output.
Theories of Wages and Profits
In his Theory of Profit, Ricardo stated that as real wages increase, real profits decrease because the revenue from the sale of manufactured goods is split between profits and wages. He said in his Essay on Profits, “Profits depend on high or low wages, wages on the price of necessaries, and the price of necessaries chiefly on the price of food.”
International Trade and Comparative Advantage
Ricardo challenged the mercantilist idea that the purpose of trade was to accumulate gold or silver. With “comparative advantage,” he argued in favour of industry specialisation and free trade, suggesting that industry specialization combined with free international trade always produces positive results. He suggested that there is mutual national benefit from trade even if one country is more competitive in every area than its trading counterpart, and that a nation should concentrate resources only in industries where it has the greatest efficiency of production relative to its own alternative uses of resources. He suggested that national industries which were mildly profitable and marginally internationally competitive should be jettisoned in favour of the industries that made the best use of limited resources. Paul Samuelson called the numbers used in Ricardo’s example dealing with trade between England and Portugal the “four magic numbers.” Ricardo’s theory of international trade was reformulated by John Stuart Mill in 1844, and the term “comparative advantage” was introduced by Mill and his contemporaries.
Criticism of the Ricardian Theory of Trade
Ricardo himself was the first to recognize that comparative advantage is a domain-specific theory, meaning it applies only when certain conditions are met. He noted that the theory applies only in situations where capital is immobile. Regarding his famous example, he wrote that it would undoubtedly be advantageous to the capitalists of England that the wine and cloth should both be made in Portugal and that the capital and labour of England employed in making cloth should be removed to Portugal for that purpose. He recognized that applying his theory in situations where capital was mobile would result in offshoring, and thereby economic decline and job loss. To correct for this, he argued that most men of property would be satisfied with a low rate of profits in their own country rather than seeking a more advantageous employment for their wealth in foreign nations, and that capital was functionally immobile. Utsa Patnaik claims that Ricardian theory of international trade contains a logical fallacy, as Ricardo assumed that in both countries two goods are producible and actually are produced, but developed and underdeveloped countries often trade those goods which are not producible in their own country. Critics also argue that the theory is flawed in that it assumes production is continuous and absolute, and that specialisation could cripple a country that depends on imports from foreign, naturally disrupted countries. As Joan Robinson pointed out, following the opening of free trade with England, Portugal endured centuries of economic underdevelopment, and she argued that Ricardo’s example required that economies be in static equilibrium positions with full employment and that there could not be a trade deficit or a trade surplus.
Ricardian Equivalence
Another idea associated with Ricardo is Ricardian equivalence, an argument suggesting that in some circumstances a government’s choice of how to pay for its spending might have no effect on the economy. This is due to the fact the public saves its excess money to pay for expected future tax increases that will be used to pay off the debt. Ricardo notes that the proposition is theoretically implied in the presence of intertemporal optimisation by rational taxpayers, but that since taxpayers do not act so rationally, the proposition fails to be true in practice. Thus, while the proposition bears his name, he does not seem to have believed it. Economist Robert Barro is responsible for its modern prominence.
Influence and Intellectual Legacy
David Ricardo’s ideas had a tremendous influence on later developments in economics. US economists rank Ricardo as the second most influential economic thinker, behind Adam Smith, prior to the twentieth century. Despite his laissez-faire capitalist views, Ricardo’s writings fascinated a number of early socialists in the 1820s, who thought his value theory had radical implications. They argued that, in view of labour theory of value, labour produces the entire product, and the profits capitalists get are a result of exploitation of workers. These include Thomas Hodgskin, William Thompson, John Francis Bray, and Percy Ravenstone. Georgists believe that rent, in the sense that Ricardo used, belongs to the community as a whole. Henry George was greatly influenced by Ricardo and often cited him, including in his most famous work, Progress and Poverty from 1879. After the rise of the ‘neoclassical’ school, Ricardo’s influence declined temporarily, but it was Piero Sraffa, the editor of the Collected Works of David Ricardo and the author of seminal Production of Commodities by Means of Commodities, who resurrected Ricardo’s influence.
