Economics - Term 2 - Week 1

Supply and demand are the cornerstones of economic theory. Supply refers to the quantity of a good or service that producers are willing and able to sell at various prices, while demand refers to the quantity that consumers are willing and able to purchase. The interaction between supply and demand determines the market price and quantity of goods sold. When demand increases, prices tend to rise, and when supply increases, prices tend to fall.

Market equilibrium occurs when the quantity supplied equals the quantity demanded at a particular price. This point is crucial because it represents a state where there is no surplus or shortage of goods. If the price is above equilibrium, a surplus occurs, leading producers to lower prices. Conversely, if the price is below equilibrium, a shortage occurs, prompting producers to raise prices. Understanding this balance helps explain price fluctuations in the market.

Consider the market for oranges. If the price of oranges is set at R10 per kilogram, and at this price, consumers want to buy 1000 kg while producers are willing to supply 800 kg, a shortage exists. To address this, the price may rise, leading to a new equilibrium where supply meets demand. If the price rises to R12, producers may supply 1200 kg, and consumers may only want 900 kg, creating a new equilibrium point.

Let's analyze what happens when consumer preferences shift. Suppose a health study reveals that oranges are extremely beneficial for health, increasing consumer demand. As a class, discuss how this change would affect the demand curve for oranges. What would happen to the equilibrium price and quantity? Students should illustrate this shift on a graph, showing the new demand curve and the resulting equilibrium.

Students will be given various scenarios where either supply or demand changes. For example, if a new technology reduces the cost of producing oranges, how would this affect supply? Students should write a short paragraph explaining the expected changes in equilibrium price and quantity for each scenario provided.

• As price increases, demand decreases.
• As price decreases, demand decreases.
• Demand is always constant regardless of price.
• Demand increases with an increase in supply.

Answer: As price increases, demand decreases.

The law of demand indicates an inverse relationship between price and quantity demanded.

• There is a surplus of goods.
• There is a shortage of goods.
• Quantity supplied equals quantity demanded.
• Prices are always rising.

Answer: Quantity supplied equals quantity demanded.

Market equilibrium is achieved when the amount of goods supplied matches the amount demanded.

Answer: Supply is the quantity of a good or service that producers are willing and able to sell at various prices.

This definition captures the essence of supply in economic terms.

Answer: A surplus occurs when the quantity supplied exceeds the quantity demanded at a given price.

Surpluses lead to downward pressure on prices as producers seek to sell excess inventory.

• Change in consumer income.
• Change in production costs.
• Change in technology.
• Change in the number of suppliers.

Answer: Change in consumer income.

An increase in consumer income typically increases demand for normal goods, shifting the demand curve to the right.

• It increases the equilibrium price.
• It decreases the equilibrium price.
• It has no effect on equilibrium price.
• It causes a shortage.

Answer: It decreases the equilibrium price.

An increase in supply generally leads to lower prices as more goods are available in the market.