Of the Component Parts of the Price of Commodities

Core idea

In a primitive society where land is free and people own their own tools, the whole price of a commodity goes to the labour that produced it — Book I, Topic 5: Of the Real and Nominal Price of Commodities's labour-theory holds purely. But in any advanced commercial society, two new claimants appear: the owner of capital (who provides tools, materials, and wage advances) and the owner of land (who lets it for rent). The price of any commodity in such a society therefore resolves into three components: wages, profit, and rent.

This is the central organising fact of Smith's economics — and of all "classical" economics for the next century. Marx, Ricardo, and Mill would all build their systems on this trinity.

Why it matters

The decomposition turns the question "what determines price?" into three sub-questions, each with its own economic logic:

1. What determines wages? (Book I, Topic 8: Of the Wages of Labour)
2. What determines profit? (Book I, Topic 9: Of the Profits of Stock)
3. What determines rent? (Book I, Topic 11: Of the Rent of Land)

It also reveals the distributive structure of society. Every output is split among three classes:

• Labourers (who own only their work-capacity) receive wages.
• Capitalists (who own accumulated stock) receive profit.
• Landlords (who own the land) receive rent.

A nation's income is therefore equal to the sum of wages, profit, and rent. This is also a foundational identity in modern national-income accounting.

The early-and-rude-state benchmark

Smith opens the topic with a thought experiment. In an early hunting society where deer cost twice the labour of beaver, deer will trade for two beavers. There is no capitalist, no landlord — the hunter who killed the deer owns the whole product, and price tracks labour exactly. This benchmark lets him isolate what changes when land becomes owned and stock becomes accumulated.

How rent and profit enter

Once land is appropriated, the landowner demands a share for use of land — that is rent. Once stock (tools, raw materials, wage advances) is accumulated, the owner who employs labourers expects a return on that stock — that is profit. Profit is not a wage of the master's own labour ("the wages of inspection and direction"); Smith insists it is a separate income, proportioned to the capital employed, not to the work done.

Why this matters for policy debates

The trinity quietly contains a politics. If profit is a return on capital, then capital is productive — saving and investment build wealth. If rent is a return on land monopoly (land that no one made), then rent is more like a tax on the rest of the economy. These distinctions echo through every subsequent debate on taxation, land reform, and the proper share of the national product going to labour.

Key takeaways

Mental model

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Practical application

Reading any modern financial statement through Smith's lens is illuminating. A firm's revenue is split between wages (employee compensation), profit (returns to shareholders and creditors), and rent (real-estate costs, plus implicit rents on monopoly positions or scarce licences). When you see corporate profit margins rising while wage shares fall, you are watching the trinity reweight. When you see "rent-seeking" criticised in policy debates, you are seeing Smith's distinction between productive profit and extractive rent put to work two and a half centuries later.

Example

A coffee shop charges £4 for a cappuccino. The decomposition: roughly £0.40 of coffee beans and milk (themselves resolving into wages, profit, rent further upstream); £1.10 of barista wages and supervisor salary; £0.80 of rent on the high-street location; £0.30 of utilities; £0.40 of equipment depreciation (profit on prior capital investments); £0.50 of net profit to the owner; £0.50 of VAT. Strip out the tax, and the £3.50 retail price resolves cleanly into wages, profit, and rent — the same trinity Smith identified in the price of a loaf of bread in 1776.

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