Microeconomics Study Guide: Step-by-Step Guidance for Key Concepts

Q1. Which event would NOT cause a nation's production possibility curve to shift outward?

Background

Topic: Production Possibility Frontier (PPF)

This question tests your understanding of what factors can expand a nation's productive capacity, shifting the PPF outward, versus those that do not.

Key Terms:

• Production Possibility Curve (PPC/PPF): Shows the maximum combinations of goods/services a nation can produce given its resources and technology.

• Outward Shift: Indicates an increase in productive capacity.

Step-by-Step Guidance

1. Review each option and ask: Does it increase the nation's resources (labor, capital, technology, natural resources)?

2. Consider whether the event is a change in the quantity or quality of resources, or just a reallocation of existing resources.

3. Identify which event is only about utilizing existing resources more efficiently (e.g., reducing unemployment), rather than expanding the resource base.

Try solving on your own before revealing the answer!

Q2. What is Fred's opportunity cost of attending the football game?

Background

Topic: Opportunity Cost

This question tests your ability to calculate opportunity cost, including both explicit and implicit costs.

Key Terms:

• Opportunity Cost: The value of the next best alternative forgone.

• Explicit Costs: Out-of-pocket expenses (ticket, parking, dinner).

• Implicit Costs: Earnings or benefits lost (wages from missed work).

Step-by-Step Guidance

1. List all explicit costs: ticket price, parking, dinner.

2. Calculate the implicit cost: income lost from not working ($10/hour × 4 hours).

3. Add explicit and implicit costs to find the total opportunity cost.

Try solving on your own before revealing the answer!

Q3. Which event does NOT cause a shift in the demand curve for a good or service?

Background

Topic: Demand Curve Shifts vs. Movements

This question tests your understanding of what factors shift the demand curve versus what causes movement along the curve.

Key Terms:

• Demand Curve Shift: Caused by changes in income, tastes, expectations, prices of related goods, etc.

• Movement Along the Curve: Caused by a change in the price of the good itself.

Step-by-Step Guidance

1. Review each option and determine if it changes the price of the good itself or another factor.

2. Identify which option describes a change in the price of the good, leading to movement along the curve, not a shift.

3. Recall that only changes in the price of the good cause movement along the curve; all other factors shift the curve.

Try solving on your own before revealing the answer!

Q4. What happens to the supply of smart phones when producers switch to tablet computers due to increased demand?

Background

Topic: Supply and Demand, Substitutes in Production

This question tests your understanding of how changes in demand for one product affect the supply of another when producers can switch between products.

Key Terms:

• Substitutes in Production: Goods that can be produced using the same resources.

• Quantity Supplied vs. Supply: Quantity supplied changes with price; supply changes with other factors.

Step-by-Step Guidance

1. Consider how an increase in demand for tablet computers affects their price and quantity supplied.

2. Think about resource allocation: If producers switch to tablets, what happens to the supply of smart phones?

3. Identify whether the supply or quantity supplied of each product increases or decreases.

Try solving on your own before revealing the answer!

Q5. What is the expected effect on SUV demand if gasoline prices increase?

Background

Topic: Demand for Related Goods, Complements/Substitutes

This question tests your understanding of how changes in the price of one good (gasoline) affect the demand for another (SUVs).

Key Terms:

• Complementary Goods: Goods consumed together (SUVs and gasoline).

• Demand Curve Shift: Change in demand due to external factors.

Step-by-Step Guidance

1. Recall that SUVs require gasoline; higher gas prices increase the cost of owning an SUV.

2. Determine whether this makes SUVs more or less attractive to consumers.

3. Identify whether the demand curve for SUVs shifts left (decreases) or right (increases).

Try solving on your own before revealing the answer!

Q6. How do hurricanes in Florida affect California citrus growers and prices?

Background

Topic: Supply Shocks, Substitutes, and Market Prices

This question tests your understanding of how supply disruptions in one region affect prices and demand for substitutes elsewhere.

Key Terms:

• Supply Shock: Sudden change in supply due to external events.

• Substitute Goods: Goods that can replace each other in consumption.

Step-by-Step Guidance

1. Analyze how a decrease in Florida orange supply affects their price.

2. Consider how this price change influences demand for California oranges.

3. Identify the chain reaction: supply decrease → price increase → demand for substitutes increases.

Try solving on your own before revealing the answer!

Q7. What happens when a price floor for wheat is set above the equilibrium price?

Background

Topic: Price Floors, Market Surplus

This question tests your understanding of how price floors affect supply, demand, and market equilibrium.

Key Terms:

• Price Floor: Minimum legal price set above equilibrium.

• Surplus: Excess supply when price is above equilibrium.

Step-by-Step Guidance

1. Compare the price floor ($4.00) to the equilibrium price ($2.50).

2. Determine how this affects quantity supplied and quantity demanded.

3. Identify the resulting market outcome (surplus, shift in curves, etc.).

Try solving on your own before revealing the answer!

Q8. What is the likely result of a price ceiling on gasoline below the market price?

Background

Topic: Price Ceilings, Shortages

This question tests your understanding of how price ceilings affect supply, demand, and market equilibrium.

Key Terms:

• Price Ceiling: Maximum legal price set below equilibrium.

• Shortage: Excess demand when price is below equilibrium.

Step-by-Step Guidance

1. Compare the price ceiling ($3.00) to the market price ($4.25).

2. Determine how this affects quantity demanded and quantity supplied.

3. Identify the resulting market outcome (shortage, shift in curves, etc.).

Try solving on your own before revealing the answer!

Q9. Calculate the price elasticity of demand for root beer given the change in price and quantity demanded.

Background

Topic: Price Elasticity of Demand

This question tests your ability to calculate elasticity using the midpoint formula.

Key Formula:

$\text{Price Elasticity of Demand} = \frac{\text{Percentage Change in Quantity Demanded}}{\text{Percentage Change in Price}}$

Midpoint formula:

$\text{Elasticity} = \frac{(Q_2 - Q_1) / ((Q_2 + Q_1)/2)}{(P_2 - P_1) / ((P_2 + P_1)/2)}$

Step-by-Step Guidance

1. Identify initial and new quantities ($Q_1 = 100,000$, $Q_2 = 80,000$) and prices ($P_1 = 1.00$, $P_2 = 1.10$).

2. Calculate the percentage change in quantity demanded using the midpoint formula.

3. Calculate the percentage change in price using the midpoint formula.

4. Set up the elasticity formula with your calculated values.

Try solving on your own before revealing the answer!

Q10. What happens to total revenue when price decreases from $18 to $6 (refer to Figure 1)?

Background

Topic: Elasticity and Total Revenue

This question tests your understanding of how elasticity affects total revenue when price changes.

Key Terms:

• Total Revenue: $\text{TR} = \text{Price} \times \text{Quantity}$

• Elastic Demand: Revenue increases when price falls.

• Inelastic Demand: Revenue decreases when price falls.

Step-by-Step Guidance

1. Determine whether demand is elastic or inelastic between points A and C.

2. Calculate total revenue at both prices ($TR_1$ and $TR_2$).

3. Compare the change in total revenue and relate it to elasticity.

Try solving on your own before revealing the answer!

Q11. What is the firm's total variable cost (TVC) at Q = 30?

Background

Topic: Costs of Production

This question tests your ability to use average total cost (ATC) and average fixed cost (AFC) to find total variable cost.

Key Formulas:

• $\text{ATC} = \frac{\text{Total Cost}}{Q}$

• $\text{AFC} = \frac{\text{Total Fixed Cost}}{Q}$

• $\text{AVC} = \text{ATC} - \text{AFC}$

• $\text{TVC} = \text{AVC} \times Q$

Step-by-Step Guidance

1. Calculate AVC using $\text{AVC} = \text{ATC} - \text{AFC}$.

2. Multiply AVC by Q to find TVC: $\text{TVC} = \text{AVC} \times Q$.

Try solving on your own before revealing the answer!

Q12. What is Ernie's marginal cost per earmuff between 200 and 220 units?

Background

Topic: Marginal Cost Calculation

This question tests your ability to calculate marginal cost given changes in output and total cost.

Key Formula:

$\text{Marginal Cost (MC)} = \frac{\text{Change in Total Cost}}{\text{Change in Output}}$

Step-by-Step Guidance

1. Find the change in total cost: $\text{TC}_{220} - \text{TC}_{200}$.

2. Find the change in output: $220 - 200$.

3. Set up the MC formula with your values.

Try solving on your own before revealing the answer!

Q13. What should a competitive firm do if its marginal cost is above the market price?

Background

Topic: Profit Maximization in Perfect Competition

This question tests your understanding of the profit-maximizing rule ($MC = MR = P$) in competitive markets.

Key Terms:

• Marginal Cost (MC): Cost of producing one more unit.

• Market Price (P): Price at which firm sells output.

• Profit Maximization: Occurs where $MC = MR = P$.

Step-by-Step Guidance

1. Compare MC to market price: If $MC > P$, producing that unit reduces profit.

2. Recall the rule: Firm should produce up to the point where $MC = P$.

3. Determine whether the firm should increase, decrease, or maintain output.

Try solving on your own before revealing the answer!

Q14. What is the profit-maximizing output for a firm in a perfectly competitive market given the cost table and market price?

Background

Topic: Profit Maximization, Cost Analysis

This question tests your ability to use cost data to find the output where $MC = MR = P$.

Key Formula:

$\text{Marginal Cost (MC)} = \text{Change in Total Cost} / \text{Change in Output}$

$\text{Profit Maximizing Output}: MC = P$

Step-by-Step Guidance

1. Calculate MC for each output level using the cost table.

2. Compare MC to market price ($30) at each output level.

3. Identify the output where $MC = P$.

Try solving on your own before revealing the answer!

Q15. Which segment reflects the short-run supply curve for positive output levels?

Background

Topic: Short-Run Supply Curve in Perfect Competition

This question tests your understanding of how the supply curve relates to the marginal cost curve above average variable cost.

Key Terms:

• Short-Run Supply Curve: Portion of MC curve above AVC.

• Positive Output Levels: Where firm is producing more than zero.

Step-by-Step Guidance

1. Identify the segment of the MC curve above AVC for positive output.

2. Match this segment to the labeled line segments in the diagram.

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Q16. What is true about Foxon's monopoly profits and costs at the given output?

Background

Topic: Monopoly Profit Calculation

This question tests your ability to calculate total cost, profit per unit, and economic profit for a monopoly.

Key Formulas:

• $\text{Total Cost} = \text{ATC} \times \text{Quantity}$

• $\text{Profit per Unit} = \text{Price} - \text{ATC}$

• $\text{Economic Profit} = (\text{Price} - \text{ATC}) \times \text{Quantity}$

Step-by-Step Guidance

1. Calculate total cost using $ATC$ and quantity.

2. Calculate profit per unit.

3. Calculate total economic profit.

Try solving on your own before revealing the answer!

Q17. What happens to price, quantity, and total surplus when a monopoly becomes competitive?

Background

Topic: Monopoly vs. Competition, Market Efficiency

This question tests your understanding of how market structure affects price, quantity, and total surplus.

Key Terms:

• Monopoly: Single seller, restricts output, raises price.

• Competitive Market: Many sellers, price falls, output increases.

• Total Surplus: Sum of consumer and producer surplus.

Step-by-Step Guidance

1. Recall that competition increases output and lowers price compared to monopoly.

2. Consider how total surplus changes when market becomes more efficient.

3. Identify the answer that reflects increased efficiency and surplus.

Try solving on your own before revealing the answer!

Q18. How does average cost pricing regulation affect a natural monopoly's output and price?

Background

Topic: Regulated Monopoly, Average Cost Pricing

This question tests your understanding of how regulation changes output and price in a natural monopoly.

Key Terms:

• Natural Monopoly: Firm with declining average costs over relevant output range.

• Average Cost Pricing: Regulator sets price equal to ATC.

Step-by-Step Guidance

1. Identify the unregulated monopoly output and price (where MR = MC).

2. Find the regulated output and price (where price = ATC).

3. Match these values to the answer choices.

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Q19. How many workers should John's Car Wash hire to maximize profit?

Background

Topic: Labor Market, Marginal Product, Value of Marginal Product

This question tests your ability to use marginal product and wage rate to determine optimal hiring.

Key Formula:

$\text{Value of Marginal Product (VMP)} = \text{Marginal Product} \times \text{Price}$

Step-by-Step Guidance

1. Calculate the marginal product for each worker.

2. Calculate VMP for each worker using the price of a car wash.

3. Compare VMP to wage rate; hire up to the point where VMP ≥ wage.

Try solving on your own before revealing the answer!

Q20. What happens to equilibrium wage and labor employed if the guest worker program is suspended?

Background

Topic: Labor Market, Supply and Demand

This question tests your understanding of how changes in labor supply affect equilibrium wage and employment.

Key Terms:

• Supply of Labor: Number of workers available.

• Equilibrium Wage: Wage where labor supply equals demand.

Step-by-Step Guidance

1. Consider how a decrease in labor supply affects the labor market.

2. Recall that reduced supply typically increases wage but decreases quantity employed.

3. Identify the answer that matches this outcome.

Try solving on your own before revealing the answer!

Q21. What happens in a competitive market with negative externalities?

Background

Topic: Externalities, Market Efficiency

This question tests your understanding of how negative externalities affect market outcomes and efficiency.

Key Terms:

• Negative Externality: Cost imposed on others not involved in the transaction.

• Market Efficiency: Achieved when all costs and benefits are accounted for.

Step-by-Step Guidance

1. Recall that competitive markets do not internalize external costs.

2. Consider whether market output is efficient or not when negative externalities are present.

3. Identify the answer that reflects market failure due to externalities.

Try solving on your own before revealing the answer!

Q22. What government action achieves efficient flu vaccination levels given a positive externality?

Background

Topic: Positive Externalities, Subsidies

This question tests your understanding of how subsidies can correct market outcomes when positive externalities exist.

Key Terms:

• Marginal Social Benefit (MSB): Total benefit to society.

• Subsidy: Payment to encourage consumption/production.

Step-by-Step Guidance

1. Identify the size of the positive externality ($2 per vaccination).

2. Recall that a subsidy equal to the external benefit aligns private and social benefits.

3. Determine the correct government action (tax or subsidy, and amount).

Try solving on your own before revealing the answer!

Q23. How do Brazil and Chile's PPFs determine comparative advantage and gains from trade?

Background

Topic: Comparative Advantage, Gains from Trade

This question tests your understanding of how comparative advantage leads to specialization and gains from trade.

Key Terms:

• Comparative Advantage: Ability to produce a good at lower opportunity cost.

• Absolute Advantage: Ability to produce more of a good with same resources.

Step-by-Step Guidance

1. Compare opportunity costs for each country for corn and outfits.

2. Identify which country has comparative advantage in each good.

3. Determine if gains from trade are possible based on specialization.

Try solving on your own before revealing the answer!

Q24. What is a key difference between tariffs and quotas?

Background

Topic: Tariffs vs. Quotas, Trade Policy

This question tests your understanding of how tariffs and quotas affect consumer surplus and government/importer revenue.

Key Terms:

• Tariff: Tax on imports, generates government revenue.

• Quota: Limit on quantity imported, may generate revenue for importers.

Step-by-Step Guidance

1. Recall who receives revenue under each policy (government vs. importer).

2. Consider effects on consumer surplus and prices.

3. Identify the answer that correctly distinguishes tariffs from quotas.

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Q25. What happens to consumer surplus and total surplus if the US imposes a tariff on Japanese cars?

Background

Topic: Tariffs, Consumer Surplus, Producer Surplus

This question tests your understanding of how tariffs affect consumer surplus, producer surplus, and total surplus.

Key Terms:

• Consumer Surplus: Benefit consumers receive from paying less than they are willing to pay.

• Producer Surplus: Benefit producers receive from selling at a price above their cost.

• Total Surplus: Sum of consumer and producer surplus.

Step-by-Step Guidance

1. Recall that tariffs raise prices, reducing consumer surplus.

2. Consider how US producers and government benefit from tariffs.

3. Determine whether total surplus increases or decreases.

Try solving on your own before revealing the answer!