How much time should I spend on each Unit 5 FRQ?

Plan for about 25 minutes on the long free-response question and roughly 12 to 13 minutes on each of the two short ones. Use the 10-minute reading period to underline command words, identify the graphs you will need, and note which parts depend on earlier answers.

Do I lose points on later parts if I get an early calculation wrong?

Usually not. AP rubrics often award consistency points, meaning a later part is graded on whether your reasoning is consistent with your own earlier answer. Always carry your result forward logically rather than switching to a different value midway.

What is the most common mistake on Phillips Curve FRQs?

Confusing a movement along the short-run Phillips Curve with a shift of the curve, and failing to specify direction. State clearly whether you are moving along the short-run curve or shifting it, and always note that the long-run Phillips Curve is vertical at the natural rate of unemployment.

Which graph should I use for deficit and crowding-out questions?

Use the loanable funds market. Show government borrowing increasing the demand for loanable funds, which raises the real interest rate and reduces private investment. Then connect that lower investment to slower long-run growth if the question asks about the long run.

AP-MACRO-5-FRQ

U5 FRQ Practice

Master Unit 5 AP Macro free-response questions: Phillips Curve, quantity theory, debt, long-run crowding out, and growth—with rubric-smart strategy.

What you'll do in this lesson

A voice-first session with the Crimsora tutor on U5 FRQ Practice, then targeted practice and FRQs — with the tutor adapting to where you get stuck.

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What this lesson covers

The AP Macroeconomics exam rewards students who can move a scenario from a prompt to a correctly labeled graph and a precise chain of reasoning. Unit 5 is where the long run lives: the difference between short-run and long-run Phillips Curves, how money growth drives inflation, why deficits can raise real interest rates, and what actually shifts long-run aggregate supply. This lesson does not re-teach those concepts—it trains you to deploy them under rubric pressure.

Here you will learn how graders read Unit 5 FRQs, which words trigger points, how to build multi-part answers that stay internally consistent, and where students routinely lose easy points. Treat every prompt as a checklist of earnable points and answer in the order asked.

How Unit 5 FRQs Are Structured and Scored

AP Macro FRQs come in three flavors: one long question and two short questions. Unit 5 content shows up most heavily in questions that ask you to reason across the short run and long run at once. Each answer part maps to a specific point on the rubric, and points are earned independently—so a wrong number in part (a) does not cost you the point in part (d) if your later logic is consistent with your own earlier answer.

Graders look for three things: a correct answer, correct direction of change, and correct explanation of the mechanism. A response that says a variable rises but explains why using a valid chain earns the explanation point even when the direction is debatable, provided the prompt allows it.

Command word	What the rubric wants
Identify / Calculate	A number or single answer, no explanation needed
Show on a graph	Correctly labeled axes, curves, and the shift or new equilibrium
Explain	A cause-and-effect chain, not a restatement
Will X increase, decrease, or stay the same	Direction plus a reason

Read the entire question before writing so your parts connect. Many Unit 5 prompts build: a fiscal action in (a) creates crowding out in (c) and affects long-run growth in (d).

The Phillips Curve and Quantity Theory Under the Rubric

Phillips Curve FRQs test whether you can connect the short-run tradeoff to the long-run vertical curve at the natural rate of unemployment. When a prompt gives expansionary policy, the standard chain is: aggregate demand rises, so in the short run unemployment falls and inflation rises—a movement up and to the left along the short-run Phillips Curve. In the long run, expectations adjust, the short-run curve shifts up, and the economy returns to the natural rate of unemployment with higher inflation.

Always state the direction of the movement or shift explicitly. Graders distinguish a movement along a curve from a shift of a curve, and students lose points by writing 'the Phillips Curve moves' without specifying which curve or which direction.

Quantity theory questions use

MV = PQ

. If asked how a change in the money supply affects the price level in the long run, invoke that velocity

V

and real output

Q

are constant in the long run, so a given percent increase in

M

produces the same percent increase in

P

. The exam loves the growth-rate version: inflation rate approximately equals money growth rate minus real output growth rate. Show the equation, plug in, and state the number.

Debt, Crowding Out, and Long-Run Growth

Loanable funds is the workhorse graph for deficit and crowding-out questions. When the government runs a larger deficit and borrows, demand for loanable funds rises, the real interest rate rises, and higher rates reduce private investment—this is crowding out. On the graph, shift demand for loanable funds rightward and show the real interest rate increasing.

The long-run payoff connects to growth: less private investment means slower capital accumulation, which shifts long-run aggregate supply and the production possibilities curve less than they otherwise would. State this link explicitly when a part asks about long-run growth—graders want the chain from interest rates to investment to capital stock to potential output.

Policy	LF market effect	Real interest rate	Investment	Long-run growth effect
Larger budget deficit	Demand shifts right	Rises	Falls (crowded out)	Slower
Budget surplus / debt paydown	Demand shifts left	Falls	Rises	Faster
Supply-side tax cut on investment	Demand may rise, supply may rise	Ambiguous	Rises	Faster

For debt sustainability, remember that debt is a stock and the deficit is a flow; a deficit adds to debt each year. If nominal GDP grows faster than debt, the debt-to-GDP ratio can fall even with a deficit.

Growth Drivers and Supply-Side Policy Answers

Growth FRQs ask you to identify what shifts long-run aggregate supply or the production possibilities curve outward. Acceptable drivers include increases in the physical capital stock, human capital or education, the labor force, technology and productivity, and property rights that encourage investment. When a prompt asks for a policy that promotes growth, name a specific mechanism: an investment tax credit raises the return to investing, so firms buy more capital, expanding potential output.

A frequent trap is confusing short-run demand effects with long-run supply effects. Government spending on infrastructure raises aggregate demand in the short run, but its growth argument is that better infrastructure raises productivity, shifting long-run aggregate supply. State both effects separately if the question spans both horizons.

When showing growth on the AD-AS model, shift the long-run aggregate supply curve rightward and, if consistent, the short-run aggregate supply curve as well. On a production possibilities curve, shift the entire frontier outward. Label the new potential output. Do not simply move along an existing curve—growth is a shift, not a movement. Tie every supply-side answer to a resource, its quantity or quality, and the resulting change in the economy's productive capacity.

A Winning FRQ Workflow

Build a repeatable routine so you never freeze. First, read every part and underline command words and the variables in play. Second, sketch any graph the question needs before writing prose, because a correct graph often anchors the explanation points. Third, answer in complete cause-and-effect sentences using the pattern 'because X, then Y, therefore Z.'

Keep your answer internally consistent. If part (a) concludes the real interest rate rises, then part (b) about investment must reflect that rise—graders award consistency points even if (a) is arguable. Never contradict yourself between parts.

Budget your time: roughly 25 minutes for the long FRQ and about 12–13 minutes each for the two short ones, matching the reading period usage. Do not write an introduction or conclusion; graders scan for the specific point, so lead with the answer. Use precise vocabulary—'natural rate of unemployment,' 'crowding out,' 'nominal versus real'—because vague phrasing forfeits explanation points. Finally, if you are unsure of a direction, still explain the mechanism clearly; a correct mechanism with a stated direction earns more than a blank.

Key terms

Short-Run Phillips Curve.: A downward-sloping curve showing the inverse tradeoff between inflation and unemployment when inflation expectations are held constant.
Long-Run Phillips Curve.: A vertical line at the natural rate of unemployment, showing no permanent tradeoff between inflation and unemployment once expectations adjust.
Quantity Theory of Money.: The relationship $MV = PQ$ ; in the long run, with velocity and real output roughly constant, changes in the money supply cause proportional changes in the price level.
Crowding Out.: The reduction in private investment caused when government borrowing raises the real interest rate in the loanable funds market.
Loanable Funds Market.: The market where savers supply funds and borrowers demand them, determining the real interest rate.
National Debt.: The accumulated stock of past budget deficits minus surpluses; the deficit is the annual flow that adds to this stock.
Long-Run Aggregate Supply.: A vertical curve at potential output that shifts only when productive capacity changes through capital, labor, or technology.
Supply-Side Policy.: Policies aimed at raising potential output by increasing the quantity or productivity of resources, such as investment tax credits or education spending.

Worked example

Assume the economy of Marisol is operating at its full-employment level of output. The government increases its budget deficit to fund a new spending program. (a) Using a correctly labeled graph of the loanable funds market, show the effect of the increased deficit on the real interest rate. (b) Given your answer in (a), what happens to private investment? (c) Explain the effect on Marisol's long-run economic growth. (d) The central bank reports that the money supply is growing at 6% per year while real GDP grows at 2% per year. Calculate the approximate long-run inflation rate.

Part (a): The government must borrow to finance the larger deficit, which increases the demand for loanable funds. On your graph, shift the demand curve rightward from

D_1

D_2

. The equilibrium moves up the supply curve, so the real interest rate rises from

r_1

r_2

. Label the axes 'Real Interest Rate' and 'Quantity of Loanable Funds' to earn the graph points.

Part (b): Because the real interest rate rose, borrowing to fund capital projects is more expensive, so private investment falls. This is the crowding-out effect. State the direction and the reason.

Part (c): With lower private investment, Marisol accumulates less physical capital over time. A smaller capital stock means the long-run aggregate supply curve shifts rightward by less than it otherwise would, so long-run economic growth is slower. Deliver this as a chain: higher interest rate, then less investment, then slower capital accumulation, then slower growth.

Part (d): Use the growth-rate form of the quantity theory: inflation rate approximately equals money growth rate minus real output growth rate, or

\pi \approx \%\Delta M - \%\Delta Q

. Substitute:

\pi \approx 6\% - 2\% = 4\%

. The approximate long-run inflation rate is 4%.

Practice questions

An economy is at long-run equilibrium when the central bank permanently increases the growth rate of the money supply. According to the long-run Phillips Curve, what is the ultimate effect on the unemployment rate and the inflation rate?

Unemployment falls permanently and inflation rises
Unemployment returns to the natural rate and inflation is higher
Both unemployment and inflation fall
Unemployment rises above the natural rate and inflation is unchanged

Answer: Unemployment returns to the natural rate and inflation is higher

Faster money growth first lowers unemployment along the short-run Phillips Curve, but as expectations adjust the short-run curve shifts up and the economy returns to the natural rate of unemployment on the vertical long-run Phillips Curve. The only lasting effect is higher inflation—money is neutral in the long run for real variables like unemployment.

A country runs a persistent budget deficit but its debt-to-GDP ratio falls over several years. Explain how this is possible, referencing the difference between a stock and a flow.

Answer: It is possible when nominal GDP grows faster than the national debt.

The deficit is a flow that adds to the national debt (a stock) each year, so the debt level itself keeps rising. However, the debt-to-GDP ratio is debt divided by nominal GDP. If nominal GDP—through real growth plus inflation—grows at a faster percentage rate than the debt is growing, the denominator outpaces the numerator and the ratio falls. This shows that running a deficit does not automatically worsen debt sustainability as long as the economy grows quickly enough.

The government enacts an investment tax credit that lowers the cost of purchasing capital for firms. Using long-run analysis, explain the effect on the economy's potential output and illustrate the change with the appropriate curve.

Answer: Potential output rises, shown by a rightward shift of the long-run aggregate supply curve.

The tax credit raises the after-tax return to investment, so firms increase purchases of physical capital. A larger capital stock raises the economy's productive capacity, shifting long-run aggregate supply rightward (equivalently, shifting the production possibilities curve outward). The key chain is: lower cost of capital, then more investment, then greater capital stock, then higher potential output. This is a supply-side effect, distinct from any short-run boost to aggregate demand.

FAQ

How much time should I spend on each Unit 5 FRQ?: Plan for about 25 minutes on the long free-response question and roughly 12 to 13 minutes on each of the two short ones. Use the 10-minute reading period to underline command words, identify the graphs you will need, and note which parts depend on earlier answers.
Do I lose points on later parts if I get an early calculation wrong?: Usually not. AP rubrics often award consistency points, meaning a later part is graded on whether your reasoning is consistent with your own earlier answer. Always carry your result forward logically rather than switching to a different value midway.
What is the most common mistake on Phillips Curve FRQs?: Confusing a movement along the short-run Phillips Curve with a shift of the curve, and failing to specify direction. State clearly whether you are moving along the short-run curve or shifting it, and always note that the long-run Phillips Curve is vertical at the natural rate of unemployment.
Which graph should I use for deficit and crowding-out questions?: Use the loanable funds market. Show government borrowing increasing the demand for loanable funds, which raises the real interest rate and reduces private investment. Then connect that lower investment to slower long-run growth if the question asks about the long run.

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