The allocation of resources in a free market, the functions of the price mechanism, and assumptions of rational economic behaviour.

What this dot point is asking

WJEC wants you to explain how the price mechanism allocates resources in a free market through its three functions, and to assess the assumption that economic agents behave rationally.

The answer

Allocation in a free market

In a pure market economy, the questions of what to produce, how to produce it and for whom are answered by prices rather than by a planner. If consumers want more of a good, their increased demand raises its price, which makes it more profitable to produce, drawing resources in; if a good falls out of favour, its price falls and resources leave. Adam Smith called this coordination the "invisible hand". The strength of the system is that it is decentralised, responsive and creates strong incentives; its weakness is that it ignores externalities, public goods and equity, the failures examined elsewhere in the unit.

The functions of the price mechanism

These functions work together. When a poor harvest cuts the supply of wheat, the price rises: it rations the smaller crop to the highest-value uses, signals scarcity to farmers and buyers, and gives farmers an incentive to plant more wheat next season while encouraging consumers to economise. No one organises this; the price does the work. The same logic reallocates resources when a new technology, fashion or shortage appears, which is why market economies adapt quickly to change.

Rational economic behaviour and its limits

Rationality is the foundation of demand and supply analysis: it lets economists predict that consumers buy less as price rises and that firms expand where profit is highest. But behavioural economics shows the assumption is only approximate. Agents have bounded rationality (limited information and limited ability to compute), so they use rules of thumb and habits; they are influenced by how choices are framed and by default options; they anchor on reference points and follow the herd; and they value losses more than equivalent gains. These systematic biases explain why "nudges", default enrolment in pension schemes, and information campaigns can change behaviour, and why some markets fail in ways the purely rational model overlooks.

Examples in context

Example 1. Surge pricing and the rationing function. Ride-hailing apps that raise fares automatically at busy times are the rationing and incentive functions made visible. The higher price rations scarce drivers to those who most need a ride, signals to drivers that demand is high, and gives them an incentive to come online, increasing supply. It is controversial precisely because rationing by price is seen as unfair in emergencies, which illustrates the tension between market efficiency and equity that runs through the unit.

Example 2. Behavioural nudges in UK policy. UK auto-enrolment into workplace pensions dramatically raised pension saving simply by changing the default: inertia and the framing of the choice, not a change in incentives, did the work. This is a direct application of behavioural economics, showing that because real consumers are boundedly rational and influenced by defaults, governments can improve outcomes by designing choices well, something the strictly rational model would deem unnecessary.

Try this

Q1. Name the three functions of the price mechanism. [3 marks]

• Cue. Rationing, signalling and incentive.

Q2. Explain one way in which behavioural economics challenges the assumption of rational behaviour. [3 marks]

• Cue. Bounded rationality, the influence of default options or framing, anchoring or herding all cause agents to deviate systematically from utility maximisation, which is why nudges can change behaviour.