How Income and Related Goods Affect DemandActivities & Teaching Strategies
Students learn best about income and related goods when they can test ideas in real contexts. By budgeting with different incomes and simulating price changes, they connect abstract concepts to decisions they make daily. Active tasks make these non-price determinants of demand feel concrete, not just theoretical.
Learning Objectives
- 1Analyze the impact of changes in consumer income on the demand for normal and inferior goods.
- 2Compare the effect of a price change in one good on the demand for its substitute and complement.
- 3Explain the difference between a movement along the demand curve and a shift of the demand curve due to income or related goods prices.
- 4Classify pairs of goods as substitutes or complements based on their price-demand relationships.
- 5Predict how specific real-world events, like salary increments or price hikes, will alter demand curves.
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Pairs: Income Change Budgets
Provide pairs with household budgets listing normal and inferior goods. First, allocate spending at base income; then, simulate a pay raise or cut and reallocate. Pairs plot demand schedules for two goods and draw shifted curves on graphs. Conclude with sharing one key observation per pair.
Prepare & details
How does a pay raise affect what people buy?
Facilitation Tip: During Income Change Budgets, circulate with sample budgets to nudge pairs toward identifying normal vs inferior goods in their choices.
Setup: Groups at tables with case materials
Materials: Case study packet (3-5 pages), Analysis framework worksheet, Presentation template
Small Groups: Substitute Price Simulations
Assign groups coffee and tea as substitutes. One group raises tea prices via scenario cards; others vote on coffee demand changes and justify with demand curves. Rotate roles twice. Groups present final curves showing rightward shifts.
Prepare & details
What happens to the demand for one product if the price of a similar product changes?
Facilitation Tip: During Substitute Price Simulations, assign each group a different price change so the class sees varied outcomes on the same curve.
Setup: Groups at tables with case materials
Materials: Case study packet (3-5 pages), Analysis framework worksheet, Presentation template
Whole Class: Complement Chain Game
List complement pairs like smartphones and cases. Teacher announces a price change for one good; class votes instantly on the partner's demand shift and sketches curves on mini-whiteboards. Reveal correct shifts after each round and tally class accuracy.
Prepare & details
Give examples of goods that are bought together and how their prices affect each other's demand.
Facilitation Tip: During Complement Chain Game, call on students to explain each link aloud before drawing the curve, to surface reasoning.
Setup: Groups at tables with case materials
Materials: Case study packet (3-5 pages), Analysis framework worksheet, Presentation template
Individual: Related Goods Matching
Distribute cards with goods and scenarios. Students match each to substitute, complement, normal, or inferior, then graph the demand shift. Peer review follows with one sentence explanation per match.
Prepare & details
How does a pay raise affect what people buy?
Facilitation Tip: During Related Goods Matching, ask students to justify their matches in writing before revealing answers, to practice explanation.
Setup: Groups at tables with case materials
Materials: Case study packet (3-5 pages), Analysis framework worksheet, Presentation template
Teaching This Topic
Teach this topic by letting students experience the shifts firsthand. Start with a quick real-world example, like how a raise changes lunch habits. Avoid lectures about income effects before students have grappled with their own budgets. Research shows that when students predict outcomes before seeing the model, they retain the concept longer. Use visuals, such as blank demand curves on desks, to anchor discussions.
What to Expect
By the end of these activities, students will confidently shift demand curves based on income changes and related goods. They will explain why some goods become more or less desirable as circumstances change. Their work will show clear, labeled curves and reasoned responses to scenarios.
These activities are a starting point. A full mission is the experience.
- Complete facilitation script with teacher dialogue
- Printable student materials, ready for class
- Differentiation strategies for every learner
Watch Out for These Misconceptions
Common MisconceptionDuring Income Change Budgets, watch for students assuming all goods become more desirable with higher income.
What to Teach Instead
Ask pairs to circle one good that would be less desirable at higher income and explain their choice using their budget sheet before they draw the shift.
Common MisconceptionDuring Substitute Price Simulations, watch for students believing price changes of substitutes cause movement along the same curve.
What to Teach Instead
Have groups hold up their price cards and mark the direction of the shift on a shared demand curve before voting on the correct outcome.
Common MisconceptionDuring Complement Chain Game, watch for students describing price changes of complements as causing movement along the demand curve.
What to Teach Instead
Prompt students to redraw the curve after each scenario and label it as a shift, then compare it to the original to see the difference in type of change.
Assessment Ideas
After Income Change Budgets, present students with a scenario: 'A student receives a scholarship.' Ask them to draw a demand curve shift for instant noodles (an inferior good) and label the direction and cause.
During Substitute Price Simulations, pose the question: 'Imagine you are a product manager for a smartphone company. How would you advise your marketing team to react if the price of a major competitor's phone drops by 20%?' Guide students to discuss substitutes and potential demand shifts using the price cards they handled.
After Related Goods Matching, provide students with two goods: 'printers' and 'ink cartridges'. Ask them to identify if they are substitutes or complements, then explain what would happen to the demand for ink cartridges if the price of printers fell by 15% using their matching work as evidence.
Extensions & Scaffolding
- For early finishers, ask them to predict and graph how demand for a luxury car shifts if income rises by 10% versus 50%.
- For struggling students, provide pre-labeled budget sheets with three income levels and three goods categories to reduce cognitive load.
- For extra time, invite a product manager guest to share how they track demand shifts for substitutes and complements in the market.
Key Vocabulary
| Normal Good | A good for which demand increases when consumer income rises, and decreases when income falls, holding other factors constant. |
| Inferior Good | A good for which demand decreases when consumer income rises, and increases when income falls, as consumers switch to more preferred alternatives. |
| Substitute Goods | Goods that can be used in place of each other; an increase in the price of one leads to an increase in the demand for the other. |
| Complementary Goods | Goods that are often consumed together; an increase in the price of one leads to a decrease in the demand for the other. |
| Demand Curve Shift | A change in the quantity demanded at every price, represented by a movement of the entire demand curve to the right or left. |
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