Lesson Notes By Weeks and Term v5 - Grade 8

Lesson Video

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Performance objectives

• Define 'market' and identify different types.
• Explain the law of demand and draw a demand curve.
• Explain the law of supply and draw a supply curve.
• Determine the equilibrium price and quantity.
• Explain how changes in demand and supply affect the market.

Lesson summary

This week, we delve into the fundamental concepts of markets, demand, and supply. Understanding these concepts is crucial because they explain how prices are determined and how resources are allocated in our economy. Think about the price of bread, maize meal, or school uniforms. Why do these prices change? What makes certain goods readily available while others are scarce? The answers lie in understanding the forces of demand and supply within markets. Understanding these principles helps us to become informed consumers, responsible citizens, and potentially successful entrepreneurs.

Lesson notes

2.1 What is a Market? A market is any place or situation where buyers and sellers interact to exchange goods or services. This interaction can be physical, like a flea market or a spaza shop, or virtual, like an online store. Markets exist because people have different needs and wants, and they specialize in producing certain goods or services. They need a platform to exchange these goods and services for money (or other goods/services in a barter system, though less common these days).

Examples of markets in South Africa: Farmers' Markets: Where farmers sell their produce directly to consumers.

Spaza Shops: Small convenience stores found in many communities.

Shopping Malls: Large retail spaces housing various businesses. Online Marketplaces (e.g., Takealot, Gumtree): Where goods and services are bought and sold online.

Stock Exchange (JSE): A market where shares of companies are bought and sold. 2.2 Demand Demand refers to the quantity of a good or service that consumers are willing and able to purchase at various prices during a specific period.

Two key factors determine demand: willingness and ability to pay. You might want a new cellphone, but if you can't afford it (ability to pay), it doesn't contribute to the demand in the market.

The Law of Demand: This fundamental principle states that, all other things being equal, as the price of a good or service increases, the quantity demanded decreases, and vice versa. This inverse relationship is why the demand curve slopes downward. Think about vetkoek. If the price of vetkoek rises sharply, you'll probably buy less and maybe choose a cheaper snack instead, like a scone.

Demand Curve: A graphical representation showing the relationship between the price of a good and the quantity demanded.

Example of a Demand Schedule and Curve: Let's consider the demand for airtime: | Price of Airtime (per Rand) | Quantity Demanded (Minutes) | |----------------------------|-----------------------------| | R1 | 100 | | R2 | 80 | | R3 | 60 | | R4 | 40 | | R5 | 20 | (Learners can draw a graph with Price on the Y-axis and Quantity on the X-axis, plotting the points from the table and connecting them to form a downward-sloping demand curve.)

Factors Affecting Demand (Besides Price): Income: Higher income usually leads to higher demand for normal goods. (e.g., as people earn more, they might buy more meat.)

Tastes and Preferences: Changes in consumer preferences can shift demand. (e.g., if a certain type of music becomes popular, the demand for it increases.)

Price of Related Goods: Substitutes:* Goods that can be used in place of each other. (e.g., if the price of bread increases, the demand for rolls might increase.)

Complements:* Goods that are used together. (e.g., if the price of pap decreases, the demand for braai meat might increase.)

Expectations: Expectations about future prices can affect current demand. (e.g., if people expect the price of petrol to rise next week, they might buy more petrol this week.)

Population: A larger population generally leads to higher demand. 2.3 Supply Supply refers to the quantity of a good or service that producers are willing and able to offer for sale at various prices during a specific period.

The Law of Supply: This principle states that, all other things being equal, as the price of a good or service increases, the quantity supplied increases, and vice versa. This direct relationship is why the supply curve slopes upward. Think about potatoes. If the price of potatoes goes up, farmers will be encouraged to plant and harvest more potatoes to sell, increasing the supply.

Supply Curve: A graphical representation showing the relationship between the price of a good and the quantity supplied.

Example of a Supply Schedule and Curve: Let's consider the supply of maize: | Price of Maize (per bag) | Quantity Supplied (bags) | |--------------------------|--------------------------| | R50 | 200 | | R100 | 400 | | R150 | 600 | | R200 | 800 | | R250 | 1000 | (Learners can draw a graph with Price on the Y-axis and Quantity on the X-axis, plotting the points from the table and connecting them to form an upward-sloping supply curve.)

Factors Affecting Supply (Besides Price): Cost of Production: Lower production costs (e.g., cheaper fertilizer for farmers) increase supply.

Technology: Improved technology can increase production efficiency and thus supply.

Number of Sellers: More sellers in the market increase supply.

Expectations: Expectations about future prices can affect current supply. (e.g., if farmers expect the price of maize to fall next year, they might sell more maize this year.)

Government Policies: Subsidies increase supply; taxes decrease supply. 2.4 Market Equilibrium Market equilibrium occurs when the quantity demanded equals the quantity supplied at a particular price. This price is called the equilibrium price, and the quantity is called the equilibrium quantity.