AP Microeconomics FRQ Practice Guide

title: "AP Microeconomics FRQ Practice Guide" description: "Master the 3 FRQ archetypes: full firm scenario with graphs, single-concept calculation, and analysis. Includes graph rules, profit shading, worked examples, and answer checklist." date: "2026-01-15" examDate: "May AP Exam" topics:

• FRQ Archetypes
• Graph Drawing Rules
• Profit Calculation
• Common FRQ Patterns

The 3 AP Microeconomics FRQs are worth 33 of your 120 points. This guide breaks down the 3 archetypes, teaches you the graph-drawing rules that earn 80% of the points, and shows worked examples for each.

FRQ Archetype 1: Full Scenario (10 pts)

Structure: A real-world scenario (firm, market, or policy) with 4-5 sub-questions. Usually requires a labeled graph + calculations + written analysis.

What the rubric looks for

1. Correct graph with all curves labeled (demand, MR, MC, ATC, AVC).
2. Equilibrium point identified: mark $P^*$ and $Q^*$ clearly.
3. Profit/loss shading: rectangle area = profit or loss, correct size and direction.
4. Calculation: show work for price, quantity, profit or consumer surplus.
5. Written explanation: cite economic principles (e.g., "firm maximizes profit where $MR = MC$").

Graph-drawing rules (earn max points)

• Label the y-axis: "Price ($)" or "Revenue/Cost ($)."
• Label the x-axis: "Quantity."
• Draw curves in order: demand (downward), then MR (below demand for monopoly), then MC (U-shaped or upward), then ATC (U-shaped or downward to a floor).
• Mark equilibrium: place an asterisk or dot where MR crosses MC; draw vertical line down to find quantity; draw horizontal line left to find price on demand.
• Shade profit: if $P > ATC$, draw a rectangle from ATC line up to P line, from 0 to $Q^*$. Use light shading (pencil).
• Shade loss: if AVC < P < ATC, same rectangle, but clearly mark "economic loss" or "negative profit."
• Shade DWL: monopoly or externality context — triangle between demand and MC/supply, above equilibrium, from monopoly Q to efficient Q.

Worked example: Perfect Competition

Scenario: A tomato farm operates in a perfectly competitive market with P = \3$ per pound. The farm's cost data:

| $Q$ (lbs) | TC ($) | AVC ($) | ATC ($) | MC ($) | |---|---|---|---|---| | 100 | 450 | 3.50 | 4.50 | 2.00 | | 200 | 800 | 3.00 | 4.00 | 2.50 | | 300 | 1050 | 3.00 | 3.50 | 3.00 | | 400 | 1300 | 3.00 | 3.25 | 3.50 |

Questions:

1. At what quantity does the farm maximize profit?
2. Is the farm earning a profit or loss? Calculate.
3. Will this farm operate in the long run? Explain.

Answer:

1. Profit-max quantity: Set $MR = MC$. Since P = MR = \3$, find where$MC = $3$: at$Q = 300$ lbs.

2. Profit: \text{Profit} = (P - \text{ATC}) \times Q = (3.00 - 3.50) \times 300 = -\150$ (loss).

3. Long-run: Since AVC = $3.00 = P, the farm is at the shutdown point (AVC equals P, not strictly less than P). In the short run, it may operate (covering variable costs). In the long run, if prices don't rise, the farm exits; other farms also exit, supply falls, price rises until P equals minimum ATC and zero profit returns.

Graph checklist:

• ☐ Horizontal demand line at P = \3$.
• ☐ U-shaped ATC and AVC curves below $P$.
• ☐ MC curve intersecting ATC and AVC at their minimums.
• ☐ Vertical line from MR = MC intersection to quantity axis: $Q = 300$.
• ☐ Horizontal line from 300 to demand curve to price axis: P = \3$.
• ☐ Loss rectangle shaded from ATC ($3.50) down to P ($3.00), width = 300.

FRQ Archetype 2: Single Concept + Calculation (5 pts)

Structure: A focused scenario testing one key concept (elasticity, surplus, DWL, MRP). Usually 2-3 sub-questions.

Example: Elasticity calculation

Scenario: The price of coffee rises from $2 to $2.50 per cup. Quantity demanded falls from 10,000 to 8,000 cups per week.

Question: Calculate the price elasticity of demand. Is demand elastic or inelastic? If the cafe wants to increase total revenue, should it raise or lower price?

Answer:

Using midpoint method: $PED = \\frac{(Q_2 - Q_1) / [(Q_1 + Q_2)/2]}{(P_2 - P_1) / [(P_1 + P_2)/2]} = \\frac{(8000 - 10000) / 9000}{(2.50 - 2) / 2.25} = \\frac{-0.222}{0.222} = -1.0$

Since $|PED| = 1.0$ (unitless), demand is unit elastic. At unit elasticity, total revenue is maximized; a price change has no net effect on TR. To increase revenue, the cafe must examine non-price strategies (promote, reduce costs).

FRQ Archetype 3: Analysis + Comparison (5 pts)

Structure: Compare two scenarios, explain a policy, or analyze long-run adjustment. Heavy on written reasoning; less graph work.

Example: Externality analysis

Scenario: A factory produces widgets and pollutes a nearby river. The external cost of pollution is $2 per widget. The market equilibrium is P = \10$,$Q = 50,000$widgets. The socially efficient quantity (where MSB = MSC) is$Q = 40,000$.

Question: Explain the deadweight loss. What government policy could correct it?

Answer:

The market produces 50,000 widgets because firms ignore the external cost. The socially efficient quantity is 40,000 (where private cost + external cost = price, or $MSC = D$). Overproduction creates deadweight loss: the sum of lost consumer and producer surplus from producing above the efficient point.

Policy: A Pigouvian tax of $2 per widget shifts the firm's supply curve (internal cost + tax = new cost) until equilibrium moves to $Q = 40,000$. Revenue from the tax can fund pollution cleanup or compensation for affected residents.

Top 10 FRQ mistakes

1. Unlabeled graph: curves exist but have no names (demand, MC, etc.). Lose 40% of the point value.
2. Profit rectangle wrong size: students confuse profit with total revenue (rectangle should be narrow, from ATC to P, not from 0 to P).
3. Forgetting MR line: for monopoly, drawing only demand + MC. Missing MR costs you the profit-max point.
4. Confusing $P = MC$ with $MR = MC$: perfect competition uses $P = MC$; all others use $MR = MC$.
5. DWL shading error: shading the wrong triangle or including the efficient area by mistake.
6. Elasticity sign confusion: always report magnitude. $PED = -1.5$ is elastic; just write "elastic" or "$|PED| = 1.5$."
7. Profit/loss determination: calculating profit but forgetting to state whether it's profit or loss in the text.
8. Missing units: "revenue = 500" instead of "revenue = $500" or "$500K."
9. No long-run justification: saying "firm will enter" without explaining why ($P > ATC$ ⟹ profit ⟹ entry).
10. Vertical lines not drawn: equilibrium quantity found but no vertical line to label it on the graph.

FRQ timing

• Long FRQ (10 pts): 12-15 minutes. 3 min for graph, 5 min for calculation, 4-7 min for written explanation.
• Short FRQ (5 pts): 6-8 minutes. Usually no graph; focus on quick calculation + 1-2 sentence explanation.

Answer checklist for every FRQ

• ☐ Read the question twice. Mark what it's asking (graph? calculation? explain?).
• ☐ Draw the graph first (don't skip it even if not explicitly asked — context clues matter).
• ☐ Label everything: axes, curves, equilibrium point, units.
• ☐ Show all calculation work (even if you use a calculator, write the formula).
• ☐ Cite an economic principle by name (profit max, shutdown rule, allocative efficiency, etc.).
• ☐ Re-read your answer for units, sign errors, and careless mistakes.

Ready to practice?

Try the AP Microeconomics topic library FRQ section → and revisit the 3-day cram plan for targeted drills. Good luck.