Lesson plan
Objectives
- Students will be able to define supply, demand, and market equilibrium.
- Students will be able to identify at least three determinants that shift demand curves and three that shift supply curves.
- Students will be able to graphically represent shifts in supply and demand and predict their impact on equilibrium price and quantity.
Materials
- Whiteboard or projector
- Markers or pens
- Handout: 'Supply and Demand Basics Worksheet'
- Graph paper (optional, for practice)
- Pencils
- Index cards for exit tickets
Warm-up
Begin by asking students: 'Imagine your favorite snack suddenly doubles in price. How would that change how much you buy? Now, imagine a new, cheaper way to produce that snack is discovered. How might that affect its availability and price?' Give students 2 minutes to think and discuss briefly with a partner. This primes them for the concepts of demand and supply.
Direct instruction
- Introduce 'Demand' as the desire, ability, and willingness to buy a product. Explain the Law of Demand: as price increases, quantity demanded decreases, and vice versa. Provide the example of movie ticket prices and attendance.
- Illustrate a demand curve on the board, showing its downward slope. Explain that a change in price causes movement ALONG the curve, while other factors cause the curve to shift.
- Discuss determinants of demand (factors that shift the curve): consumer income, tastes and preferences, price of related goods (substitutes/complements), expectations, and number of buyers. Give an example: if incomes rise, demand for luxury cars shifts right.
- Introduce 'Supply' as the amount of a product producers are willing and able to offer for sale at various prices. Explain the Law of Supply: as price increases, quantity supplied increases, and vice versa. Use the example of farmers growing more crops when prices are high.
- Illustrate a supply curve on the board, showing its upward slope. Explain that a change in price causes movement ALONG the curve, while other factors cause the curve to shift.
- Discuss determinants of supply (factors that shift the curve): cost of inputs, technology, productivity, taxes/subsidies, expectations, number of sellers, and government regulations. Give an example: new technology for smartphone production shifts supply right.
- Explain 'Market Equilibrium' as the point where quantity demanded equals quantity supplied. Show how the intersection of supply and demand curves on a graph determines equilibrium price and quantity. Use a simple numerical example to find equilibrium from a table.
- Briefly introduce 'shortage' (quantity demanded exceeds quantity supplied) and 'surplus' (quantity supplied exceeds quantity demanded) as market imbalances.
Guided practice
The teacher will guide students through analyzing a market scenario. 'Let's consider the market for coffee. If a new scientific study reveals that drinking coffee significantly improves health, what would happen to the demand for coffee?' (Students should say demand increases, curve shifts right.) 'How would this affect the equilibrium price and quantity of coffee?' (Price increases, quantity increases.) The teacher will then draw this shift on the board, explaining each step. 'Now, what if a severe frost damages coffee crops globally?' (Supply decreases, curve shifts left.) 'How would this affect equilibrium price and quantity?' (Price increases, quantity decreases.) The teacher will demonstrate this on the graph.
Independent practice
Students will work individually on the 'Supply and Demand Basics Worksheet.' They will identify determinants, draw shifts in supply and demand curves, and predict changes in equilibrium price and quantity for various scenarios. The teacher will circulate to provide support and clarification.
Closure
To wrap up, ask students to reflect on the most important concept they learned today. Distribute index cards for an exit ticket. Prompt: 'Describe one factor that would cause the demand curve for smartphones to shift to the right and explain why.' Collect cards as students leave to gauge understanding.
Assessment
Mastery will be assessed through the completion and accuracy of the 'Supply and Demand Basics Worksheet' and the responses on the exit ticket. A short quiz at the beginning of the next class will also measure retention of key concepts and graphical analysis skills.
Differentiation
For struggling learners, provide pre-drawn graphs for shifts, allow peer collaboration on the worksheet, and offer a simplified vocabulary list. For advanced learners, challenge them to analyze scenarios involving simultaneous shifts in both supply and demand, or research a current event and explain its impact on a specific market using supply and demand principles.
Supply and Demand Basics: Market Scenarios
For each problem, read the scenario carefully. Identify whether the event affects supply or demand, and whether it causes an increase or decrease. Then, describe the shift and predict the impact on equilibrium price (P) and quantity (Q). If indicated, sketch the shift on a simple graph (draw axes, D1/S1, then D2/S2).
- 1. The price of beef decreases significantly. How does this affect the demand for chicken (a substitute)?
- 2. A new, highly efficient robotic system is introduced for car manufacturing. How does this affect the supply of cars?
- 3. Consumer incomes rise across the country. How does this affect the demand for luxury vacations?
- 4. The government imposes a new tax on the production of sugary drinks. How does this affect the supply of sugary drinks?
- 5. A popular celebrity endorses a new brand of athletic shoes. How does this affect the demand for those shoes?
- 6. The cost of computer chips (an input) increases dramatically. How does this affect the supply of laptops?
- 7. Consumers expect the price of gasoline to significantly increase next week. How does this affect the current demand for gasoline?
- 8. A new, cheaper alternative to traditional textbooks (e-books) becomes widely available. How does this affect the demand for traditional textbooks?
- 9. A major hurricane destroys a large portion of a region's citrus crops. How does this affect the supply of oranges?
- 10. The population of a city dramatically increases due to new job opportunities. How does this affect the demand for housing in that city?
Supply and Demand Quick Check
- Which of the following best defines 'demand' in economics?
- The amount of goods available for sale.
- The desire to buy a product.
- The desire, ability, and willingness to buy a product.
- The price at which a product is sold.
Answer: The desire, ability, and willingness to buy a product. - According to the Law of Demand, what happens when the price of a good increases?
- Quantity demanded increases.
- Quantity demanded decreases.
- Supply increases.
- Demand shifts to the right.
Answer: Quantity demanded decreases. - A factor that causes the entire demand curve to shift is called a:
- Price change.
- Quantity change.
- Determinant of demand.
- Movement along the curve.
Answer: Determinant of demand. - Which of the following would cause the demand curve for cars to shift to the right?
- An increase in the price of gasoline.
- A decrease in consumer incomes.
- A popular new car model is released.
- An increase in the price of steel (an input).
Answer: A popular new car model is released. - What does the Law of Supply state?
- As price increases, quantity demanded decreases.
- As price increases, quantity supplied increases.
- Supply curves are always downward sloping.
- Producers always supply the same amount regardless of price.
Answer: As price increases, quantity supplied increases. - Which of the following would cause the supply curve for smartphones to shift to the left?
- A decrease in the cost of producing smartphones.
- An improvement in smartphone manufacturing technology.
- An increase in taxes on smartphone production.
- An increase in the number of smartphone producers.
Answer: An increase in taxes on smartphone production. - Market equilibrium occurs when:
- Quantity demanded is greater than quantity supplied.
- Quantity supplied is greater than quantity demanded.
- Quantity demanded equals quantity supplied.
- The government sets the price.
Answer: Quantity demanded equals quantity supplied. - If there is a shortage in the market, what is likely to happen to the price?
- Price will decrease.
- Price will increase.
- Price will remain the same.
- Quantity supplied will decrease.
Answer: Price will increase.
Supply and Demand in the Real World
Understanding supply and demand helps us analyze everyday economic events. This homework will ask you to apply what we learned in class to real-world situations, encouraging you to think critically about how different factors influence markets. It's a great opportunity to see economics in action and discuss with family members how these forces affect their lives and purchasing decisions.
- Define 'demand' and 'supply' in your own words, providing one unique example for each.
- List and briefly explain three determinants of demand (factors that shift the demand curve).
- List and briefly explain three determinants of supply (factors that shift the supply curve).
- Find a recent news article (from the last 6 months) that discusses a change in the price or availability of a good or service. Summarize the article.
- Using the concepts of supply and demand, explain what caused the change in price/availability discussed in your chosen news article. Was it a shift in demand, supply, or both?
- Draw a simple supply and demand graph for the scenario in your news article. Label the axes, the original curves (D1, S1), and the new curves (D2, S2) to show the shift(s). Indicate the change in equilibrium price and quantity.
Vocabulary
- Demand · noun
- The desire, ability, and willingness to buy a product.
- "Consumer demand for new video games increases during holiday seasons."
- Supply · noun
- The amount of a product that producers are willing and able to offer for sale at various prices.
- "The supply of fresh produce can be affected by weather conditions."
- Law of Demand · noun
- An economic principle stating that as the price of a good increases, the quantity demanded decreases, and vice versa.
- "The Law of Demand explains why fewer people buy a product when its price goes up."
- Law of Supply · noun
- An economic principle stating that as the price of a good increases, the quantity supplied increases, and vice versa.
- "According to the Law of Supply, companies produce more when they can sell products at higher prices."
- Equilibrium · noun
- The point where the quantity demanded equals the quantity supplied, resulting in a stable market price and quantity.
- "The market reaches equilibrium when buyers and sellers agree on a price and quantity."
- Shortage · noun
- A situation where the quantity demanded is greater than the quantity supplied at a given price.
- "A shortage of popular toys often occurs during the holiday shopping season."
- Surplus · noun
- A situation where the quantity supplied is greater than the quantity demanded at a given price.
- "A surplus of unsold goods can lead to stores offering discounts to clear inventory."
- Determinants of Demand · noun phrase
- Non-price factors that can cause the entire demand curve to shift, such as income, tastes, or prices of related goods.
- "Changes in consumer tastes are one of the key determinants of demand for fashion items."
- Determinants of Supply · noun phrase
- Non-price factors that can cause the entire supply curve to shift, such as input costs, technology, or government regulations.
- "Improved technology is a significant determinant of supply, allowing more efficient production."
- Demand Curve · noun
- A graph showing the quantity demanded at each and every price that might prevail in the market.
- "An increase in income typically shifts the demand curve for normal goods to the right."
- Supply Curve · noun
- A graph showing the quantity supplied at each and every price that might prevail in the market.
- "Higher production costs would cause the supply curve to shift to the left."
Activities
- Think-Pair-Share: Price Impact · 10 minutes
Students individually brainstorm how a significant price change (e.g., gas price increase) affects their purchasing habits. They then pair with a classmate to share their thoughts, identifying common themes and differences. Finally, a few pairs share their insights with the whole class, connecting their experiences to the Law of Demand.
- Market Scenario Analysis (Group) · 10 minutes
Divide students into small groups. Each group receives a unique market scenario (e.g., 'A new technology drastically reduces the cost of producing solar panels'). Groups must identify whether supply or demand is affected, the direction of the shift, and predict the impact on equilibrium price and quantity. They prepare to present their analysis to the class.
- Graphing Shifts Practice · 15 minutes
Provide students with blank graph paper or a digital graphing tool. Present several scenarios one by one (e.g., 'What happens to the market for umbrellas on a very rainy day?'). Students individually sketch the initial supply and demand curves, then draw the shifted curve and indicate the new equilibrium. Teacher circulates to check understanding and provide feedback.
- Real-World Determinants Match · 10 minutes
Prepare cards with various real-world events (e.g., 'New diet trend makes kale popular,' 'Minimum wage increases for factory workers'). Students, individually or in pairs, must match each event to the correct determinant of supply or demand and state whether it causes an increase or decrease. This reinforces the connection between theory and practical examples.