Lesson Notes By Weeks and Term v5 - Grade 8

Lesson Video

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Performance objectives

• Define demand and supply.
• Explain the law of demand and the law of supply with SA examples.
• Identify factors that change demand and supply.
• Explain how markets reach an equilibrium price.
• Give practical examples of price changes in your community.

Lesson summary

This week, we delve into the fundamental principles of how markets function. Understanding markets, demand, and supply is crucial because it directly impacts our daily lives. From the price of bread at your local spaza shop to the availability of school uniforms before the new term, these forces are constantly at play. In South Africa, with its diverse economy and socio-economic challenges, understanding these concepts empowers you to make informed decisions about your spending, saving, and future economic participation. By understanding how demand and supply influence prices, you can become a more responsible consumer and a more informed citizen.

Lesson notes

a) What is a Market? A market isn't necessarily a physical place like a flea market or a supermarket, although those are examples. In economics, a market is any place where buyers (demanders) and sellers (suppliers) can interact to exchange goods or services. This interaction can happen physically, online, or even through phone calls. The key is that it involves a transaction. b)

Demand: Demand refers to the quantity of a good or service that buyers are willing and able to purchase at various prices during a specific period. "Willing" means consumers want the product. "Able" means they have the money to buy it. Demand is not just wanting something, it's also being able to afford it.

The Law of Demand: This fundamental principle states that as the price of a good or service increases, the quantity demanded decreases, and vice versa, assuming all other factors remain constant (ceteris paribus).

Think about pap (maize porridge): if the price of maize flour significantly increases, families might buy less pap and look for cheaper alternatives like rice or bread.

Demand Curve: A demand curve is a graphical representation of the relationship between price and quantity demanded. It typically slopes downwards from left to right, illustrating the inverse relationship described by the Law of Demand. Factors Affecting Demand (Other than Price): Several factors, other than price, can influence the demand for a product. These factors cause the entire demand curve to shift either to the left (decrease in demand) or to the right (increase in demand). These are called non-price determinants of demand.

Some key factors include: Consumer Income: If people's incomes increase (e.g., government grants increase), they are likely to demand more goods and services, even at the same prices.

Tastes and Preferences: Changes in tastes or preferences (e.g., due to advertising or trends) can affect demand. If a new soccer boot is endorsed by a famous player, more learners might demand it.

Prices of Related Goods: Substitute Goods: If the price of a substitute good increases, the demand for the original good will increase (e.g., if the price of mielie meal increases, the demand for rice may increase).

Complementary Goods: If the price of a complementary good increases, the demand for the original good will decrease (e.g., if the price of petrol increases, the demand for large, fuel-inefficient cars might decrease).

Population: A larger population generally leads to higher demand for most goods and services.

Expectations: If people expect the price of something to increase in the future, they might increase their demand for it today. c)

Supply: Supply refers to the quantity of a good or service that sellers are willing and able to offer for sale at various prices during a specific period. "Willing" means producers want to sell the product. "Able" means they can produce and offer it.

The Law of Supply: This principle states that as the price of a good or service increases, the quantity supplied increases, and vice versa, assuming all other factors remain constant (ceteris paribus). A farmer is more likely to bring more tomatoes to the market when the price of tomatoes is high, as they will make more profit.

Supply Curve: A supply curve is a graphical representation of the relationship between price and quantity supplied. It typically slopes upwards from left to right, illustrating the direct relationship described by the Law of Supply. Factors Affecting Supply (Other than Price): Similar to demand, factors other than price can shift the entire supply curve. These are called non-price determinants of supply.

Some key factors include: Cost of Production: If the cost of producing a good or service increases (e.g., due to higher wages or raw material costs), the supply will decrease (shift to the left).

Technology: Improvements in technology usually lead to increased efficiency and lower production costs, resulting in an increase in supply (shift to the right).

Number of Sellers: More sellers in the market lead to a higher overall supply.

Expectations: If producers expect the price of their product to increase in the future, they might decrease their current supply to sell more later at the higher price.

Government Policies: Subsidies (government payments to producers) increase supply, while taxes decrease supply. d)

Market Equilibrium: Market equilibrium is the point where the quantity demanded equals the quantity supplied. At this point, there is no surplus (excess supply) or shortage (excess demand). The price at which this occurs is called the equilibrium price, and the quantity is called the equilibrium quantity.

Shortages: If the price is below the equilibrium price, there will be a shortage (demand exceeds supply). This puts upward pressure on the price as buyers compete for limited goods.

Surpluses: If the price is above the equilibrium price, there will be a surplus (supply exceeds demand).