On Natural and Market Price

Ricardo now separates the price a commodity happens to fetch today from the price around which it tends to settle. Market price is the immediate price produced by supply and demand. Natural price is the price required to keep the ordinary advances of wages, profits, and rent covered in that line of business.

Term	Meaning
Natural price	The centre price that covers ordinary wages, profits, and rent for producing a commodity
Market price	The actual price paid in a particular market at a particular time
Effectual demand	Demand backed by willingness and ability to pay the natural price
Accidental demand	A temporary excess or shortage that pushes market price away from natural price
Capital movement	The shift of capital toward unusually profitable trades and away from unusually unprofitable trades
Tendency	Ricardo's claim that competition pulls market price back toward natural price, not that the two are always equal

Ricardo's distinction is easiest to read as a centre-of-gravity model. A commodity can sell above or below its natural price for a time. But if it sells above, producers receive unusually high profits and more capital enters that trade. If it sells below, profits are low and capital leaves.

The point is not that markets are calm. Ricardo expects disturbances. The point is that competition gives those disturbances a direction: high profit invites imitation, and low profit discourages continued production.

Ricardo uses effectual demand for demand that can pay the natural price. Mere desire is not enough. If many people want silk but cannot pay the price that covers ordinary production costs, their desire does not keep silk production going.

desire alone
      !=
effectual demand

effectual demand =
buyers ready to pay enough
to replace wages, profits, and rent

This connects Chapter IV back to Chapter I. Value is not regulated by usefulness alone. A commodity must be useful, but the ordinary price of a reproducible commodity is tied to the conditions that reproduce it.

Suppose the natural price of a pair of shoes is 100. A sudden shortage raises the market price to 130. Shoemakers now earn more than the ordinary profit. New capital enters shoe-making, supply expands, and the market price is pulled back down.

Situation	Natural price	Market price	Signal	Competitive response
Shortage	100	130	Extra profit	Capital enters; supply rises
Balance	100	100	Ordinary profit	Capital stays
Glut	100	80	Low profit or loss	Capital leaves; supply falls

Ricardo is describing a tendency, not a stopwatch. The adjustment may be slow because capital is fixed in tools, leases, skills, and contracts. But the direction of pressure is clear.

Keep the chapter in a three-line price map:

market price above natural price
        |
        v
extra profit -> capital enters -> larger supply

market price at natural price
        |
        v
ordinary profit -> capital remains

market price below natural price
        |
        v
loss or low profit -> capital leaves -> smaller supply

This is one of Ricardo's bridges from value theory to distribution theory. Natural price includes the ordinary rewards of the producing classes, while market price shows the temporary bargaining result.

The word "natural" can mislead. Ricardo is not saying the natural price is fair, good, or ordained. He means it is the price toward which a competitive economy tends when production can adjust. It is a reproduction price: if the price stays below it, the commodity will not continue to be supplied in the same quantity.

The phrase also does not erase monopoly or scarcity. Rare goods and privileged producers can remain outside the normal adjustment process because supply cannot freely expand.

Imagine three trades with the same ordinary natural price of 100.

Trade	Market price today	Gap	What capital sees
Shoes	130	+30	More than ordinary profit
Hats	100	0	Ordinary profit
Cloth	80	-20	Less than ordinary profit

Capital is attracted toward shoes and away from cloth. If enough capital can move, shoe supply rises and cloth supply falls. That movement narrows the gaps. The market does not need a planner to announce the correction; the profit difference is the signal.

Chapter IV gives Ricardo a way to talk about temporary market accidents without abandoning his deeper price theory. Later chapters can ask whether wages, profits, trade, taxes, or machinery change natural prices or only disturb market prices for a time.

Without this distinction, every price movement would look equally important. With it, Ricardo can separate passing scarcity from a permanent change in the cost of reproduction.

Natural price is Ricardo's centre price. Market price is the actual price, often disturbed by temporary supply and demand. Competition moves capital in response to profit gaps, so market price tends toward natural price when production is open to adjustment.

• Market price can be above, below, or equal to natural price.
• Natural price covers ordinary wages, profits, and rent in production.
• Effectual demand means demand able to pay the natural price.
• A high market price attracts capital; a low market price repels it.
• The tendency toward natural price is strongest where capital and supply can move freely.

A reader is ready to continue when they can explain why Ricardo needs two price concepts.

• [ ] Can you define natural price without making it sound moral?
• [ ] Can you distinguish effectual demand from mere desire?
• [ ] Can you explain why a shortage creates extra profit?
• [ ] Can you use the lab to make capital enter and then reduce the price gap?
• [ ] Can you say why fixed capital or monopoly slows the adjustment?