1.8.1 The Price Mechanism — Practice Questions
Seven original multiple-choice questions on how markets and prices allocate resources, written to the style and difficulty of AQA Paper 3 Section A.
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7 questions in this set
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1. The three functions of the price mechanism are usually described as
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Answer: C (Rationing, incentive and signalling.). Prices do three jobs at once in a free market. They ration scarce goods to those willing and able to pay, they give producers an incentive to supply more where prices are high, and they signal to both sides where resources should move. Adam Smith called the combined effect the invisible hand.
Why the other options are wrong
- A — Equity, efficiency and stability are policy objectives a government might pursue, not functions performed by prices.
- B — Production, distribution and exchange are stages of economic activity rather than functions of the price mechanism.
- D — Taxes, subsidies and regulation are forms of government intervention in the price mechanism, not part of how it works by itself.
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2. A poor harvest causes the price of coffee beans to rise sharply, and consumers reduce the quantity they buy. This best illustrates the price mechanism's
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Answer: B (Rationing function.). With less coffee available, the higher price allocates the reduced quantity to those willing and able to pay most, and squeezes out everyone else. That is the rationing function: price does the job of deciding who gets a scarce good, without any queue, ballot or official making the decision.
Why the other options are wrong
- A — The incentive function concerns producers responding to the higher price by supplying more. Here the focus is on consumers being priced out.
- C — The signalling function is the information the price change conveys about relative scarcity. Rationing is what the price actually does to the quantity each buyer gets.
- D — Redistribution is not one of the functions of the price mechanism; it is something governments do through taxes and benefits.
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3. The price of lithium rises, and mining firms respond by opening new extraction sites. This best illustrates the price mechanism's
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Answer: D (Incentive function.). A higher price raises the profitability of supplying lithium, so firms commit resources to producing more of it. That is the incentive function: price changes motivate producers to expand where returns are high and to withdraw where they are low, which is how resources are reallocated between markets over time.
Why the other options are wrong
- A — The rationing function concerns how a limited quantity is shared among buyers. Here the response comes from the supply side.
- B — Redistribution of income is a government objective, not a function of prices.
- C — Regulation is a form of intervention imposed on a market rather than something the price mechanism does.
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4. A sustained rise in the price of a good conveys information to producers that it has become relatively scarce. This is the price mechanism's
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Answer: C (Signalling function.). The signalling function is about the information a price carries. A rising price tells everyone in the market that the good has become scarcer relative to demand — without anyone having to be told directly. Signalling and incentive work together: the signal conveys the information, and the profit motive supplies the reason to act on it.
Why the other options are wrong
- A — The incentive function is the response to the signal — firms committing resources because higher prices mean higher profits.
- B — The rationing function concerns who ends up with the good once it is scarce.
- D — Stabilisation is a macroeconomic policy objective rather than a function of prices.
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5. Which one of the following is an advantage of using the price mechanism to allocate resources?
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Answer: C (It responds automatically to changes in consumer demand.). The great strength of the price mechanism is that it works automatically. No central authority needs to gather information or issue instructions: when consumers want more of something, the price rises, profits rise, and resources move in. It is fast, decentralised and requires no administration — which is why market economies allocate most goods this way.
Why the other options are wrong
- A — The market rewards those with purchasing power, and it takes no account of fairness. Inequality is one of the standard criticisms of relying on it.
- B — Public goods are precisely what the market fails to provide, because non-excludability makes the free rider problem insurmountable.
- D — Nothing can remove scarcity. The price mechanism is a way of managing it, not abolishing it.
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6. Which one of the following is a disadvantage of relying on the price mechanism alone to allocate resources?
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Answer: A (It allocates goods according to ability to pay, ignoring need.). Price rations by willingness and ability to pay, which says nothing about need. A wealthy household outbids a poor one for housing however urgent the poorer family's situation. Alongside this equity objection sit the efficiency failures: the market under-provides merit goods and public goods, over-provides demerit goods, and ignores externalities altogether.
Why the other options are wrong
- B — Requiring no bureaucracy is one of the price mechanism's advantages. It is central planning that demands a large administrative apparatus.
- C — Prices adjust quickly, often within hours in commodity and financial markets. Speed of response is a strength rather than a weakness.
- D — Profit is what drives the incentive function. Competition erodes supernormal profit in the long run, but normal profit is earned throughout.
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7. A government imposes a maximum price on a good well below its equilibrium level. In terms of the price mechanism, the most significant consequence is that
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Answer: A (Prices can no longer ration or signal properly.). A binding price ceiling stops the price from doing its work. It can no longer ration, so the shortage is settled by queues, waiting lists or the black market instead. It can no longer signal scarcity accurately, so producers are not told that more is wanted, and the incentive to supply is weakened rather than strengthened. This is a common route to government failure: intervention aimed at fairness ends up worsening the allocation of resources.
Why the other options are wrong
- B — A lower price makes supplying the good less profitable, so the incentive to produce it weakens and the quantity supplied falls.
- C — The good remains just as scarce — indeed the shortage grows. What has changed is the mechanism used to decide who gets it.
- D — Allocative efficiency requires price to equal marginal cost. Holding price artificially below that level moves the market away from it.