Q1. Calculate the price elasticity of demand for oranges using the given data.

Background

Topic: Price Elasticity of Demand (PED)

This question tests your ability to calculate the price elasticity of demand using percentage changes in quantity demanded and price. PED measures how much the quantity demanded of a good responds to a change in its price.

Key Terms and Formulas

• Price Elasticity of Demand (PED): Measures the responsiveness of quantity demanded to a change in price.

• Formula:

Step-by-Step Guidance

1. Identify the average quantity and average price provided: 520 units and $150.

2. Note the percentage change in quantity demanded () and percentage change in price ().

3. Set up the PED formula using these values:

5. Calculate the value up to this point, but do not simplify to the final answer yet.

Try solving on your own before revealing the answer!

Q2. Explain the determinants of price elasticity of demand (PED) with examples.

Background

Topic: Determinants of Price Elasticity of Demand

This question asks you to describe the main factors that influence how elastic or inelastic the demand for a good is, and to provide examples for each.

Key Terms

• Determinants of PED: Factors that affect how sensitive quantity demanded is to price changes.

• Common determinants include: availability of substitutes, type of good, market definition, proportion of income spent, and time horizon.

Step-by-Step Guidance

1. List each determinant: (a) Time, (b) Types of goods, (c) Market definition, (d) Proportion of the good in consumer’s budget.

2. For each determinant, briefly explain how it affects PED. For example, more substitutes make demand more elastic.

3. Provide a real-world example for each determinant. For instance, luxury cars (large budget share) vs. salt (small budget share).

4. Summarize how these determinants interact to influence the elasticity of demand for a product.

Try explaining each determinant and example before revealing the answer!

Q3. a) Calculate and compare the price elasticity of demand along two demand curves (D1 and D2) between given points.

Background

Topic: Comparing Elasticities Along Different Demand Curves

This question tests your ability to calculate and interpret PED for different demand curves using percentage changes in quantity and price.

Key Terms and Formulas

• Price Elasticity of Demand (PED):

Step-by-Step Guidance

1. For D1, use the given percentage changes: , .

2. Set up the PED formula for D1:

4. Repeat for D2: , .

6. Interpret which demand curve is more elastic based on the magnitude of PED (without calculating the final value yet).

Try setting up the calculations before revealing the answer!

Q3. b) Show the specific calculations for total revenue changes along D1 and D2.

Background

Topic: Total Revenue and Elasticity

This part asks you to calculate how total revenue changes as you move along different demand curves, given changes in price and quantity.

Key Terms and Formulas

• Total Revenue (TR):

Step-by-Step Guidance

1. Identify the initial and new price and quantity for each demand curve (D1 and D2).

2. Calculate initial total revenue: .

3. Calculate new total revenue: .

4. Find the change in total revenue: .

5. Interpret whether total revenue increased or decreased for each curve (do not state the final values yet).

Try calculating the total revenues before revealing the answer!

Q3. c) Summarize the relationship between price changes, PED, and total revenue.

Background

Topic: PED and Total Revenue Relationship

This part asks you to summarize how total revenue changes depending on whether demand is elastic, inelastic, or unit elastic, and whether price rises or falls.

Key Terms

• Elastic Demand:

• Inelastic Demand:

• Unit Elastic:

Step-by-Step Guidance

1. Recall the rules for how total revenue changes with price and elasticity:

2. For elastic demand, a price decrease increases total revenue; a price increase decreases total revenue.

3. For inelastic demand, a price decrease decreases total revenue; a price increase increases total revenue.

4. For unit elastic demand, total revenue is maximized and does not change with small price changes.

5. Summarize these relationships in a table or list (do not copy the final summary yet).

Try summarizing the relationships before revealing the answer!

Q4. Identify whether goods are substitutes or complements based on cross-price elasticity.

Background

Topic: Cross-Price Elasticity of Demand

This question tests your understanding of how the relationship between two goods (substitutes or complements) is reflected in the sign of their cross-price elasticity.

Key Terms

• Cross-Price Elasticity: Measures how the quantity demanded of one good responds to a price change in another good.

• Substitutes: Positive cross-price elasticity.

• Complements: Negative cross-price elasticity.

Step-by-Step Guidance

1. Recall that if two goods are substitutes, an increase in the price of one increases demand for the other.

2. If two goods are complements, an increase in the price of one decreases demand for the other.

3. Assign the correct sign (positive or negative) to the cross-price elasticity for each pair.

4. Provide an example for each case (e.g., tea and coffee as substitutes; printers and ink as complements).

Try identifying the relationships before revealing the answer!

Q5. Explain the elasticity of supply in different scenarios.

Background

Topic: Price Elasticity of Supply

This question asks you to explain what it means for supply to be perfectly inelastic, perfectly elastic, inelastic, or elastic, and to interpret elasticity coefficients.

Key Terms

• Perfectly Inelastic Supply: Quantity supplied does not change with price (vertical supply curve).

• Perfectly Elastic Supply: Quantity supplied is infinitely responsive to price (horizontal supply curve).

• Elasticity Coefficient:

Step-by-Step Guidance

1. For each scenario, define the type of elasticity (perfectly inelastic, perfectly elastic, inelastic, elastic).

2. Describe the shape of the supply curve for each case (vertical, horizontal, steep, or flat).

3. Explain what the elasticity coefficient means (e.g., 0.5 means inelastic, 1.7 means elastic).

4. Provide a real-world example for each type of supply elasticity.

Try explaining each scenario before revealing the answer!

Q6. Explain the market outcome when supply is perfectly inelastic at a quantity of 1 unit.

Background

Topic: Market Equilibrium with Perfectly Inelastic Supply

This question tests your understanding of how market price is determined when supply is fixed and how demand shifts affect equilibrium price.

Key Terms

• Perfectly Inelastic Supply: Supply curve is vertical; quantity supplied does not change with price.

• Market Equilibrium: Where supply and demand curves intersect.

Step-by-Step Guidance

1. Draw or visualize a vertical supply curve at quantity = 1 unit.

2. Identify the equilibrium price as the point where the demand curve intersects the vertical supply curve.

3. Consider what happens if demand decreases (shifts left): the equilibrium price falls, but quantity remains at 1 unit.

4. Explain why the price is determined by demand in this case, since supply cannot change.

Try explaining the market outcome before revealing the answer!

Q7. Media Review Analysis: PED, graphs, and determinants

Background

Topic: PED Definition, Graphs, and Determinants

This question covers several aspects: defining PED, drawing and labeling elastic/inelastic demand curves, interpreting a PED value, and discussing determinants of demand elasticity.

Key Terms and Formulas

• PED:

• Elastic Demand:

• Inelastic Demand:

Step-by-Step Guidance

1. Define PED: the responsiveness of quantity demanded to a change in price.

2. Draw two demand curves: one relatively flat (elastic), one steep (inelastic). Label axes and curves.

3. Interpret the PED value of -0.719: since , demand is inelastic.

4. Discuss the availability of substitutes for milk and how this affects its elasticity.

5. List and explain three determinants of PED, such as type of good, time, and budget share.

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