Economics · Grade 9 · Markets and Price Determination · Term 1

Determinants of Demand

Exploring the non-price factors that cause the entire demand curve to shift.

• Ontario Curriculum Expectations
• CEE.Std3.2

About This Topic

Determinants of demand, also known as non-price factors, are crucial for understanding shifts in the entire demand curve. These factors include changes in consumer income, tastes and preferences, the prices of related goods (substitutes and complements), expectations about future prices, and the number of buyers in the market. For instance, an increase in income typically leads to higher demand for normal goods, while demand for inferior goods may decrease. Similarly, a surge in popularity for a product will shift its demand curve to the right, irrespective of its current price.

Understanding these determinants allows students to analyze real-world market changes. For example, a heatwave might increase demand for ice cream (tastes) and air conditioners (substitutes for fans), while a successful advertising campaign for a new smartphone could boost its demand and potentially decrease demand for older models (complements or substitutes). This topic moves beyond simple price-quantity relationships to explore the dynamic forces shaping consumer behavior and market outcomes.

Active learning is particularly beneficial here because it allows students to actively engage with these abstract concepts through simulations and case studies, making the invisible forces of demand tangible and observable.

Key Questions

1. Analyze how changes in income affect the demand for normal versus inferior goods.
2. Predict the impact of changing consumer tastes on market demand.
3. Compare how substitute and complementary goods influence demand shifts.

Watch Out for These Misconceptions

Common Misconception

A change in price causes the demand curve to shift.

What to Teach Instead

A change in price causes a movement *along* the existing demand curve, not a shift of the curve itself. Active learning activities like graphing exercises where students plot points based on price changes versus scenarios where a determinant changes help distinguish between these two concepts.

Common Misconception

All goods are normal goods, meaning demand always increases with income.

What to Teach Instead

Students may not recognize the concept of inferior goods. Using relatable examples in class discussions or having students research and present examples of inferior goods (like bus tickets or generic brands) helps them grasp that demand for some goods decreases as income rises.

Active Learning Ideas

Demand Determinant Scenarios

Present students with various real-world scenarios, such as a celebrity endorsing a product or a sudden decrease in the price of a competing good. Students work in small groups to identify the relevant determinant of demand and predict whether the demand curve will shift left or right, justifying their reasoning.

30 min·Small Groups

Consumer Income Simulation

Divide the class into two groups representing different income levels. Provide both groups with a list of goods and services. Have them 'shop' for items, adjusting their choices based on their assigned income level, and then discuss how income differences impacted their purchasing decisions and the demand for various goods.

25 min·Whole Class

Substitute and Complement Sort

Provide pairs of goods on cards. Students sort them into categories: substitutes, complements, or unrelated. They then explain how a price change in one good would affect the demand for the other, fostering discussion and peer teaching.

20 min·Pairs

Frequently Asked Questions

What are the main non-price factors that affect demand?

The primary non-price factors influencing demand are changes in consumer income, shifts in tastes and preferences, the prices of substitute and complementary goods, consumer expectations about future prices, and the number of buyers in the market. These factors cause the entire demand curve to shift left or right.

How does advertising influence the demand curve?

Advertising primarily influences consumer tastes and preferences. Successful advertising campaigns aim to increase a product's desirability, leading to an increase in demand at every price level. This results in an outward or rightward shift of the demand curve.

What is the difference between substitute and complementary goods?

Substitute goods can be used in place of one another, like coffee and tea. If the price of coffee increases, the demand for tea (a substitute) will likely rise. Complementary goods are used together, such as printers and ink cartridges. If the price of printers falls, the demand for ink cartridges (a complement) will likely increase.

How can role-playing help students understand determinants of demand?

Role-playing allows students to embody different consumer profiles or market situations. For example, one student could act as a consumer whose income just increased, while another acts as a seller facing a new competitor. This active participation makes the abstract determinants of demand more concrete and memorable.