Prices signal what people want, reward producers who supply it, and ration goods to those willing and able to pay.
The price mechanism is the way prices, set by demand and supply, allocate resources in a market economy. It answers the three basic questions without anyone planning the whole economy.
What to produce: when demand for a good rises, its price rises. This signals that buyers want more and makes producing it more profitable. Firms move resources into that good.
How to produce: firms want to keep costs low to earn profit. If wages rise, firms may switch to methods that use more machines.
For whom to produce: goods go to buyers who are willing and able to pay the market price. This means people with higher incomes can buy more, which is one criticism of the price mechanism.
- Price mechanism
- Demand and supply setting prices that allocate resources.
- Signalling
- Price changes show where buyers want more or less.
- Rationing
- Goods go to those willing and able to pay the price.
Worked example: Prices reallocating resources: home exercise equipment
Suppose more people start exercising at home after a health campaign.
- Signal: demand for exercise bikes rises, so their price rises.
- Incentive: higher profit encourages firms to produce more bikes and new firms to enter.
- Resources move: factories, workers and materials shift from other products into bikes.
- Rationing: at the higher price, bikes go to buyers who value them most and can afford them.
Watch out for this
Under the price mechanism, the government decides what each firm produces.
In a pure market system, nobody decides centrally. Prices, driven by consumers' demand and firms' search for profit, guide what is produced.
Check your understanding
Demand for plant-based meat rises sharply. How does the price mechanism respond?
- Its price rises, so firms find it more profitable and move resources into producing it.
- The government orders farms to grow more plant crops.
- Prices stay the same because firms want to keep customers happy.