What this lesson teaches
I can explain how prices signal, give incentives and ration scarce resources in a free market.
Syllabus 8843, 2.1.1(a). Price Mechanism and its Functions: How the price mechanism allocates scarce resources in the free market through signalling, incentive and rationing functions
Make a guess
Rain hits the CBD at 6pm and the ride-hailing app raises fares. Which is NOT one of the jobs that the higher fare does?
- It signals that rides are scarce in the CBD.
- It cuts the number of people asking for rides.
- It gives off-duty drivers a reason to start driving.
- It makes sure everyone who needs a ride gets one.
Show the answer
It makes sure everyone who needs a ride gets one.
Prices ration by willingness and ability to pay. Some passengers who need rides go without, which is efficient but not always fair.
Prices signal, give incentives and ration, and together they move resources to where they are wanted.
In a free market, no one decides how many mechanics, bakers or bicycles there should be. Price changes do the coordinating.
Signalling: a rising price tells producers that buyers want more of the good. A falling price tells them to produce less.
Incentive: a higher price makes producing the good more profitable, so firms produce more and new firms may enter. Resources move into this market and out of others.
Rationing: a higher price discourages some buyers, so the limited output goes to those most willing and able to pay. This is efficient, but not necessarily fair. People who cannot afford the price go without.
- Signalling
- Price changes tell producers what buyers want.
- Incentive
- Higher prices make it worth producing more.
- Rationing
- Higher prices limit who buys the scarce good.
Write each function as a chain
Signalling
Price rises, which tells producers that buyers want more.
Incentive
Higher price means higher profit, so firms produce more and resources move in.
Rationing
Higher price means some buyers drop out, so output goes to those most willing and able to pay.
Worked example: Surge pricing for rides in the rain
A heavy downpour hits the CBD at 6pm. Many more people want private-hire rides than there are drivers on the road.
- Demand shifts right, creating a shortage at the normal fare.
- The app raises fares. This signals where rides are scarce.
- Higher fares give off-duty drivers an incentive to log on and drive to the CBD.
- Higher fares ration rides: some passengers wait, walk or take the MRT, so the rides go to those most willing and able to pay.
Watch out for this
Rationing means the government gives everyone a fixed allowance.
In the price mechanism, rationing happens through price. A higher price reduces quantity demanded until it matches what is available.
Check your understanding
Repair prices rise, and some cyclists put off non-urgent repairs. Which function does this show?
- Signalling.
- Incentive.
- Rationing.
Show the answer
Rationing.
Right. The higher price limits who buys the scarce repairs to those most willing and able to pay.