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Move from lesson study to exam practice in Economics.
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Imagine Thandi at the Durban beachfront market, choosing between vendors selling vetkoek. She wants the best price, while sellers want to make a profit. This daily negotiation is the heart of a market. In economics, a market is any place where buyers and sellers interact to exchange goods or services. It could be a taxi rank in Khayelitsha or an online store in Sandton. The price is not set by one person, but by the interaction of many buyers and sellers. A common misconception is that sellers alone set prices. In reality, both buyers’ willingness to pay and sellers’ willingness to sell determine the final price. This dynamic creates what we call the market price. The market price is always changing as new information or events affect buyers and sellers. For example, if a Springboks match is about to start, more people might want snacks, so prices can rise quickly. This shows how markets are alive and responsive to real-life events.
Picture maize sellers in Polokwane’s market. If maize is cheap, more people want to buy it, but fewer farmers want to sell. If maize is expensive, more farmers bring maize, but fewer people buy. The demand curve shows the relationship between price and quantity demanded: as price falls, demand rises. The supply curve shows the opposite: as price rises, supply increases. The point where these two curves cross is the equilibrium. At this price, the amount buyers want to buy equals the amount sellers want to sell. No one leaves the market unsatisfied. Many learners think equilibrium is a fixed number. In fact, it changes whenever demand or supply shifts. For example, if a new maize mill opens near Polokwane, more maize may be supplied at every price, shifting the equilibrium. Equilibrium is a moving target, not a permanent spot.
Suppose there’s a taxi strike in Mthatha. Suddenly, fewer taxis are available. This is a decrease in supply. The supply curve shifts left, causing the equilibrium price for a taxi ride to rise, and the number of rides to fall. Alternatively, imagine Banyana Banyana wins a big match and more fans want team jerseys. This increases demand, shifting the demand curve right. The equilibrium price and quantity both rise. Understanding these shifts helps explain why prices change after events like load-shedding or droughts. Don’t confuse a movement along a curve (caused by price changes) with a shift of the curve (caused by other factors like income or input costs). For example, if the price of taxi rides rises because of higher fuel costs, that’s a movement along the supply curve. But if a new law limits the number of taxis, that’s a shift of the supply curve. Recognising the difference is key for exam success.
Step 1: List the demand and supply schedules. At R20, 100 people want rides; at R30, 80 want rides. For supply, at R20, 60 taxis offer rides; at R30, 80 taxis offer rides. Step 2: Find the price where quantity demanded equals quantity supplied. At R30, both are 80. Step 3: State the equilibrium. The equilibrium price is R30 per ride, with 80 rides exchanged. Step 4: Sanity check: At prices below R30, more people want rides than taxis available (shortage). At prices above R30, more taxis than passengers (surplus). This matches what we see in real taxi ranks: when prices are too low, people queue for taxis; when too high, taxis wait for passengers.
Step 1: Draw the original demand and supply curves for maize on a graph, with price on the vertical axis and quantity on the horizontal axis. Step 2: Show the drought’s effect by shifting the supply curve left (less maize available at every price). Step 3: Identify the new intersection point of the demand and new supply curve. The new equilibrium price is higher, and the equilibrium quantity is lower. Step 4: Explain why. The drought reduces supply, so maize becomes scarcer and more expensive. Step 5: Sanity check: This matches what happens in real markets—scarcity pushes prices up. For example, after the 2016 drought in South Africa, maize meal prices rose sharply and many families felt the impact.
Question: At R10, 50 vetkoek are demanded and 30 supplied. At R15, 40 are demanded and 40 supplied. How do we find equilibrium? Let’s think: Look for the price where demand equals supply. At R15, both are 40. So, equilibrium price is R15, quantity is 40. Try this: At R20, demand is 30, supply is 50. What happens? Answer: There is a surplus of 20 vetkoek, because supply (50) is greater than demand (30). Vendors may have to lower prices to sell all their vetkoek.
Question: After Bafana Bafana wins, demand for jerseys rises. What happens to equilibrium price and quantity? Let’s model: Demand curve shifts right. New intersection is at a higher price and quantity. Worked response: Both equilibrium price and quantity increase. Now you: If supply of jerseys increases (more factories), what happens? Answer: Equilibrium price falls, quantity rises. This is because more jerseys are available at every price, so sellers must lower prices to attract buyers, but more jerseys are sold overall.
1. Define market equilibrium in your own words, using a South African example such as taxi fares or maize prices. 2. List two factors that can shift the demand curve (for example, changes in income or consumer preferences, like a new mall opening in your area or a sports team winning a big match). 3. State what happens when price is above equilibrium (there is a surplus, and sellers may lower prices to clear excess stock, such as unsold bread at the end of the day in a local bakery).
1. Draw a simple demand and supply diagram for taxi rides in your area, labelling axes and equilibrium clearly. 2. Explain what happens to equilibrium if fuel prices rise sharply (supply decreases, price rises, quantity falls; relate this to minibus taxi fare increases during petrol hikes). 3. Calculate the equilibrium price and quantity given: At R25, demand is 60, supply is 60; at R20, demand is 80, supply is 40. Which price is equilibrium? (Answer: R25, 60 rides). 4. Give one real-life event that could shift the supply curve for a common good in your community and explain its effect.
1. Analyse the effects of a government-imposed maximum price on bread in a township (shortage, possible black market, and how this impacts daily life for both buyers and sellers). 2. Predict what happens to the maize market after a bumper harvest (supply increases, price falls, quantity rises; think of how this affects food prices in your home). 3. Solve for new equilibrium if demand increases by 20 units at every price (draw new curve, find new intersection with supply, and explain the changes). 4. Justify why understanding equilibrium is important for making decisions as a future business owner or consumer in South Africa.
Answer: Where quantity demanded equals quantity supplied
Equilibrium is the point where buyers and sellers agree on price and quantity. Many think it’s set by government, but it’s the market’s balance.
Answer: There will be a shortage of rides
At prices below equilibrium, more people want rides than taxis available. Some think supply will always rise, but not if price is too low.
Answer: Consumers’ incomes rise
Higher incomes mean people can buy more maize at every price, shifting demand right. A drought affects supply, not demand.
Answer: Price rises, quantity falls
A leftward shift in supply makes goods scarcer and more expensive. Some confuse this with a demand shift.
Answer: A shortage
A price ceiling below equilibrium means more demand than supply, causing shortages. Many think it helps everyone, but it creates new problems.
Some believe government can simply set prices to fix problems. For example, if bread prices rise in Soweto, people may call for price controls. But if the government sets the price below equilibrium, demand will exceed supply, causing shortages. Sellers may stop selling, or a black market may appear. If the price is set above equilibrium, there will be unsold bread. Understanding equilibrium helps us see why price controls can create more problems than they solve. The market, left alone, tends to balance itself—unless outside forces intervene. In South Africa, price controls on bread and petrol have sometimes led to queues, rationing, or even illegal trading. It’s important to understand that while government intervention can help in emergencies, it often leads to unintended consequences if not carefully managed. This is why economists pay close attention to how equilibrium works in real markets.
Answer: Equilibrium is at R45, quantity is 50.
At R50, supply (60) is greater than demand (40), so there is a surplus. At R40, demand (60) is greater than supply (40), so there is a shortage. The equilibrium must be between these prices. By averaging, R45 is where demand and supply both meet at 50. This method is commonly used in exam questions to find equilibrium when given two points.
Answer: A drought reduces supply, shifting the supply curve left, raising price and lowering quantity.
Less maize means higher prices and fewer sales. Many confuse this with a demand shift, but it is the supply curve that moves due to less production.
Answer: If demand increases, equilibrium price rises; if supply increases, equilibrium price falls.
When demand increases, more buyers compete for goods, pushing prices up. When supply increases, more goods are available, so sellers lower prices to attract buyers. Learners often mix up the effects of demand and supply shifts.
Answer: Movement along the curve
A price change causes movement along the curve, not a shift. Many learners mix these up.
Answer: Supply decreases, price rises
Supply falls, so bread becomes scarcer and more expensive. Some confuse this with demand changes.
Answer: Supply increases, price falls
More taxis mean greater supply, so price drops. Some think more taxis mean higher prices, but it’s the opposite.