Elasticity of Demand and Supply

Lesson Plan: Elasticity of Demand and Supply

Objectives:

By the end of this lesson, students will be able to:

• Define price elasticity of demand and supply and explain the factors that influence them.

• Calculate the price elasticity of demand and supply using the midpoint formula.

• Interpret the elasticity coefficient and classify demand and supply as elastic, inelastic, or unit elastic.

• Explain the relationship between price elasticity of demand and total revenue.

• Analyze how elasticity affects real-world markets and business decisions.

Materials:

• Whiteboard or projector

• Markers or pens

• Calculators

• Handout with practice problems

• Real-world examples (newspaper articles, case studies)

Lesson Duration: 50 minutes

Procedure:

1. Introduction (5 minutes)

   • Begin by asking students about their understanding of demand and supply. Briefly review the laws of demand and supply.

   • Introduce the concept of elasticity as a measure of responsiveness to changes in price or other factors.

   • Explain that this lesson will focus on price elasticity of demand and supply.

2. Price Elasticity of Demand (15 minutes)

   • Define price elasticity of demand (PED) as the percentage change in quantity demanded divided by the percentage change in price.

   • Explain the concept of elastic, inelastic, and unit elastic demand. Provide examples of goods with different elasticities (e.g., gasoline vs. luxury cars).

   • Introduce the midpoint formula for calculating PED:

   • Work through a sample problem on the board, demonstrating how to use the midpoint formula to calculate PED.

   • Discuss the factors that influence PED, such as:

     • Availability of substitutes

     • Necessity vs. luxury goods

     • Proportion of income spent on the good

     • Time horizon

3. Price Elasticity of Supply (10 minutes)

   • Define price elasticity of supply (PES) as the percentage change in quantity supplied divided by the percentage change in price.

   • Explain the concept of elastic, inelastic, and unit elastic supply.

   • Discuss the factors that influence PES, such as:

     • Availability of inputs

     • Production capacity

     • Time horizon

   • Work through a sample problem on the board, demonstrating how to calculate PES.

4. Elasticity and Total Revenue (10 minutes)

   • Explain the relationship between price elasticity of demand and total revenue (TR).

   • Discuss how businesses can use PED to make pricing decisions.

   • If demand is elastic, a decrease in price will increase total revenue.

   • If demand is inelastic, an increase in price will increase total revenue.

   • If demand is unit elastic, a change in price will not affect total revenue.

   • Illustrate with examples:

     • A concert venue lowering ticket prices to increase attendance (elastic demand).

     • A pharmaceutical company raising the price of a life-saving drug (inelastic demand).

5. Active Learning Activity: Group Discussion (5 minutes)

   • Divide students into small groups.

   • Provide each group with a real-world scenario (e.g., a local coffee shop considering raising prices, an oil producer facing fluctuating prices).

   • Ask each group to analyze the scenario and discuss how elasticity would affect the outcome.

   • Have each group share their findings with the class.

6. Wrap-up and Assessment (5 minutes)

   • Summarize the key concepts of elasticity of demand and supply.

   • Assign practice problems for homework.

   • Encourage students to think about elasticity in their daily lives (e.g., when buying groceries, filling up their car).

Assessment:

• Observe student participation in class discussions.

• Review student responses to practice problems.

• Consider a short quiz or exam on the concepts of elasticity of demand and supply.

Differentiation:

• For students who need extra support, provide additional examples and practice problems.

• For advanced students, challenge them to research real-world case studies of elasticity in action.

• Allow students to work in pairs or small groups to complete assignments.

BSSE Standards Alignment:

This lesson aligns with the BSSE standards by teaching students how to:

• Understand and apply economic concepts such as elasticity of demand and supply.

• Analyze how markets respond to changes in prices and other factors.

• Use economic reasoning to make informed decisions.

• Develop critical thinking and problem-solving skills.

Thought-Provoking Questions:

1. How do you think the availability of substitutes influences the price elasticity of demand for a product?

2. In what ways might a business adjust its pricing strategy based on the elasticity of demand for its products?

3. Can you think of a situation where a product's demand might be considered elastic? What factors contribute to this elasticity?

4. How does understanding elasticity help businesses make better decisions in a competitive market?

5. What role does consumer behavior play in determining the elasticity of demand and supply for a good or service?