Have you ever wondered why a pair of rare sneakers can cost hundreds of dollars, while a bag of Halloween candy goes on sale for almost nothing the day after October 31st? It is not random. There is a hidden force shaping every price tag you see in shops across New Zealand.
Words to own
- Economy
- The whole system of how people, businesses, and governments make, buy, and sell things.
- Supply
- How much of a particular item or service is available for people to buy.
- Demand
- How much people actually want to buy a particular item or service.
- Shortage
- When demand is higher than supply, which usually drives prices up because there is not enough to go around.
- Surplus
- When supply is higher than demand, which usually drives prices down because there is too much left over.
- Scarcity
- When there is a limited amount of something people want, making it highly valuable.
What is the Economy?
Imagine you set up a lemonade stand on the hottest day of summer. Everyone wants a cold drink, so you could probably charge more than usual and people would still buy it. But on a cold, rainy day, hardly anyone wants lemonade—so even a low price might not sell much.
That everyday scenario contains the two most important ideas in economics: supply and demand. Together, they form our economy. An economy is simply the whole system by which people, businesses, and governments make, buy, and sell goods and services.
Goods are physical things you can touch, like sneakers or books. Services are things people do for you, like a haircut or fixing a computer.
| Point | Shortage (High Demand, Low Supply) | Surplus (Low Demand, High Supply) |
|---|---|---|
| What it means | More people want the item than there are items available. | There are more items available than people want to buy. |
| Impact on Price | Prices go UP as buyers compete with each other. | Prices go DOWN as sellers try to attract buyers. |
| Real-world Example | Rare sneaker drops or concert tickets. | Halloween candy on November 1st. |
| Shop Owner Action | Can charge more money or order more stock. | Puts items on sale or offers discounts. |
The Rules of Supply and Demand
Supply is how much of something is available. Demand is how much people want to buy it. Prices move up and down based on how these two forces interact with each other.
If demand rises but supply stays the same, you get a shortage. Because more people want the item but there is still the same amount to go around, buyers will pay more to secure it, pushing prices UP.
On the other hand, if supply rises but demand stays the same, you get a surplus. There is more of it available, but the same number of people want it. Sellers must drop their prices DOWN to convince people to buy the extra stock.
Real-World Price Swings
This isn't just theory—it explains prices you see in shops every day. Think about umbrellas. Umbrella supply usually stays roughly the same year-round, but demand spikes whenever it rains heavily. During a rainy stretch, umbrellas can be harder to find or slightly pricier. Once the sun comes back out, demand drops and prices settle back down.
Another example is holiday items. Leftover Halloween candy goes on sale cheap right after October 31st. This is because demand has dropped sharply, but the shops still have a large supply of stock they need to clear out.
Scarcity is when something is deliberately kept in low supply. Think of limited-edition sneakers. Because supply is tiny but demand is huge, people are willing to pay massive resale prices.
The Government's Role
The economy isn't just run by shops and shoppers. Governments also play a massive role in shaping how things work. They collect taxes from workers and businesses to pay for public services.
These public services include things we all use, like schools, hospitals, roads, and parks. Sometimes, the government steps in to regulate trade, protect local New Zealand businesses, or control prices on essential goods to make sure everyone can afford them.
Myth-busting corner
MythShops can charge whatever high price they want for any item at any time.
TruthIf a shop sets a price too high, demand will drop to zero. Shops must find the balance where customers are actually willing to pay, guided by supply and demand.
MythThe government owns and controls everything in the economy.
TruthIn New Zealand's mixed economy, businesses are mostly owned by private individuals, but the government steps in to provide public services and enforce rules.
Exam answer that scores full marks
Using the concepts of supply and demand, explain why prices of umbrellas might go up during a rainy season.
During a rainy season, more people want to buy umbrellas because they need protection from the wet weather—this represents an increase in demand. If shops do not significantly increase the number of umbrellas they stock (meaning the supply stays roughly the same), this high demand outpaces the available supply, creating a shortage. According to the basic rules of economics, when there is a shortage, prices tend to rise because customers are competing to buy a limited number of items. Once the rainy season ends, demand drops back down, the shortage disappears, and prices typically settle back to normal.
Why it scores
- Clearly defines the increase in demand caused by the rainy weather.
- Explains that supply remains constant, creating a temporary shortage.
- Applies the economic rule that a shortage drives prices up.
- Concludes with what happens to the price when demand eventually drops.