Unit 5 covers the long-run effects of fiscal and monetary policy, including the Phillips curve trade-off, how money growth drives inflation, how deficits accumulate into national debt and crowd out investment, and what determines an economy's long-run growth rate.
Fiveable's AP Macroeconomics Unit 5 review covers 7 topics, with guided practice questions for the unit.
Analyze how expansionary and contractionary fiscal and monetary policies can be combined to close recessionary or inflationary output gaps, and trace the effects on AD, real output, the price level, and interest rates.
Graph the downward-sloping SRPC and vertical LRPC, distinguish movements along the SRPC from shifts of it, and explain how demand and supply shocks produce different inflation-unemployment outcomes including stagflation.
Apply the quantity theory of money (MV = PY) to explain why sustained money supply growth causes long-run inflation rather than real output growth, and calculate missing variables using the equation of exchange.
Define the budget deficit and surplus, explain how annual deficits accumulate into the national debt, and analyze the burden created by interest payments on outstanding debt.
Use the loanable funds market to show how government borrowing raises the real interest rate, reduces private investment, and can slow long-run capital accumulation and economic growth.
Measure economic growth as the change in real GDP per capita, explain the role of the aggregate production function, and connect improvements in technology and capital per worker to rightward LRAS shifts and outward PPC shifts.
Evaluate supply-side fiscal policies, infrastructure investment, and human capital development as tools for raising potential output, labor productivity, and real GDP per capita over the long run.
Try AP-style questions on unit 5, then use the review notes below for anything you miss.
A timed, AP-style test built only from unit 5 questions — multiple choice plus free response, scored with AI feedback. Use the standard format or build your own.
When the economy is in a recessionary gap, policymakers can use expansionary fiscal policy (increase G or cut taxes), expansionary monetary policy (increase money supply, lower interest rates), or both together to shift AD rightward toward full employment. In an inflationary gap, contractionary versions of each policy shift AD leftward. The policy mix matters: combining both tools can amplify effects on real output and the price level, but the two policies can also work at cross-purposes if one is expansionary while the other is contractionary.
If the government increases spending and the central bank simultaneously raises interest rates, what is the likely net effect on AD, real output, and the price level?
| Policy | AD shift | Real output (SR) | Price level (SR) | Interest rates |
|---|---|---|---|---|
| Expansionary fiscal | Right | Rises | Rises | Tends to rise |
| Expansionary monetary | Right | Rises | Rises | Falls |
| Contractionary fiscal | Left | Falls | Falls | Tends to fall |
| Contractionary monetary | Left | Falls | Falls | Rises |
The Phillips curve translates the AD-AS model into inflation-unemployment space. The downward-sloping SRPC shows that in the short run, lower unemployment is associated with higher inflation. The vertical LRPC sits at the natural rate of unemployment, showing that no permanent trade-off exists. Long-run equilibrium is where the SRPC intersects the LRPC. Points left of that intersection represent inflationary gaps; points right represent recessionary gaps.
An oil price spike hits the economy. On a Phillips curve diagram, show what happens to inflation and unemployment in the short run and explain which curve shifts.
| Event | Curve affected | Direction | Inflation | Unemployment |
|---|---|---|---|---|
| AD increases (demand shock) | Movement along SRPC | Up-left | Rises | Falls |
| AD decreases (demand shock) | Movement along SRPC | Down-right | Falls | Rises |
| Adverse supply shock | SRPC shifts up | Upward shift | Rises | Rises |
| Favorable supply shock | SRPC shifts down | Downward shift | Falls | Falls |
The quantity theory of money uses the equation MV = PY, where M is the money supply, V is the velocity of money, P is the price level, and Y is real output. When the economy is at full employment, V and Y are assumed stable in the long run, so sustained increases in M translate directly into proportional increases in P. Money is neutral in the long run: faster money growth raises inflation, not real GDP.
Using MV = PY, if the money supply grows 6% and real output grows 2% with constant velocity, what is the approximate inflation rate?
A government budget deficit occurs when government purchases plus transfer payments exceed tax revenues in a given year. Each annual deficit adds to the accumulated national debt. Once debt exists, the government must pay interest on it, which itself becomes a spending obligation that can crowd out other priorities and compound the debt over time.
If tax revenues are 4.2 trillion, what is the budget deficit, and how does this affect the national debt?
| Fiscal outcome | Definition | Effect on national debt |
|---|---|---|
| Budget surplus | Revenues exceed expenditures | Reduces national debt |
| Balanced budget | Revenues equal expenditures | No change to national debt |
| Budget deficit | Expenditures exceed revenues | Increases national debt |
When the government runs a deficit, it borrows by issuing Treasury securities, which increases the demand for loanable funds. In the loanable funds market, this rightward shift in demand raises the equilibrium real interest rate. Higher real interest rates make borrowing more expensive for private firms and households, reducing interest-sensitive private investment spending. In the long run, less private investment means slower capital accumulation and lower economic growth.
Draw the loanable funds market before and after the government increases deficit spending. Label the shift, the new equilibrium real interest rate, and explain the effect on private investment.
Economic growth is measured as the growth rate of real GDP per capita over time. The aggregate production function shows that output depends on the quantity of labor and capital and on the level of technology (total factor productivity). Labor productivity, measured as output per employed worker, rises when workers have more physical capital, more human capital, or access to better technology. An outward shift of the PPC is equivalent to a rightward shift of the LRAS curve.
If real GDP grows from 21 trillion while population grows 1%, calculate the approximate growth rate of real GDP per capita and identify one factor that could have caused it.
Public policies can raise long-run growth by increasing productivity or expanding labor force participation. Government investment in infrastructure and technology raises total factor productivity, shifting LRAS rightward. Supply-side fiscal policies, such as investment tax credits, R&D subsidies, and education funding, change incentives for households and businesses, affecting both aggregate supply and potential output. These policies differ from demand-side stabilization because their primary goal is expanding the economy's productive capacity.
Explain how a government investment in broadband infrastructure affects LRAS, SRAS, and real GDP per capita in the long run, using the aggregate production function as your framework.
| Policy type | Primary target | Short-run effect | Long-run effect |
|---|---|---|---|
| Expansionary fiscal (demand-side) | AD | Raises real output and price level | Returns to potential; may crowd out investment |
| Infrastructure investment (supply-side) | LRAS and TFP | Modest AD boost from spending | Raises potential output and real GDP per capita |
| Education and training (supply-side) | Human capital | Small short-run AD effect | Raises labor productivity and LRAS over time |
| R&D tax credits (supply-side) | Technology | Encourages private investment | Raises TFP and shifts LRAS rightward |
| Term | Definition |
|---|---|
| MV=PY | The quantity theory of money equation: money supply (M) times velocity (V) equals the price level (P) times real output (Y). Used to show that sustained money growth raises the price level proportionally when V and Y are stable. |
| Quantity Theory of Money | The theory that the price level is directly proportional to the money supply in the long run, assuming constant velocity and full-employment output. The basis for explaining inflation as a monetary phenomenon. |
| Natural Rate of Unemployment | The unemployment rate at full employment, consisting of frictional and structural unemployment. The LRPC is vertical at this rate, and the economy returns to it in the long run after any demand shock. |
| Long-run Phillips curve (LRPC) | A vertical curve at the natural rate of unemployment showing that no permanent trade-off between inflation and unemployment exists in the long run. Shifts only when the natural rate itself changes. |
| Stagflation | The simultaneous occurrence of rising inflation and rising unemployment, caused by an adverse supply shock that shifts the SRPC upward and SRAS leftward. |
| Budget Deficit | The annual shortfall when government purchases plus transfer payments exceed tax revenues. Each deficit adds to the accumulated national debt. |
| Government borrowing | The process by which a government finances a budget deficit by issuing Treasury securities, increasing the demand for loanable funds and raising the real interest rate. |
| Real Interest Rate | The nominal interest rate adjusted for inflation; the relevant rate for private investment decisions and the key variable affected by crowding out in the loanable funds market. |
| Capital Accumulation | The buildup of physical capital stock over time through investment. Crowding out reduces private investment and slows capital accumulation, lowering long-run productive capacity. |
| Aggregate Production Function | The relationship between total output and the inputs of labor, physical capital, and technology. Shows that output per worker rises with more capital per worker or better technology. |
| GDP per capita | Real GDP divided by population; the standard measure of economic growth and living standards over time. Growth in this measure reflects rising labor productivity or a larger capital stock. |
| Supply-Side Fiscal Policies | Tax and spending policies aimed at raising productive capacity by improving incentives to work, invest, and innovate, shifting LRAS rightward and increasing potential output. |
| labor productivity | Output per employed worker. Rises with more physical capital per worker, more human capital per worker, or technological improvement, and is the primary driver of real GDP per capita growth. |
| LRAS curve | The vertical long-run aggregate supply curve at full-employment output. Shifts rightward when technology improves or when physical or human capital per worker increases. |
| Inflationary Gap | A positive output gap where actual output exceeds potential output. On the Phillips curve, this corresponds to a point left of the LRPC where unemployment is below the natural rate. |
Miss rates come from Fiveable multiple-choice practice.
Demand shocks (AD shifts) cause movement along the existing SRPC: unemployment and inflation move in opposite directions. Supply shocks (SRAS shifts) cause the entire SRPC to shift: both unemployment and inflation move in the same direction. Drawing a shift when you should show movement, or vice versa, is a frequent graph error.
Money is neutral only in the long run at full employment. In the short run, an increase in the money supply can lower interest rates and raise real output. Students often incorrectly state that money growth never affects real GDP, when the correct claim is that it has no lasting effect on real output in the long run.
A budget deficit is a flow: the shortfall in a single year. The national debt is a stock: the total accumulated borrowing over all years. A government can reduce its deficit (borrow less this year) while the national debt still grows, because any positive deficit still adds to the total.
Students often stop the crowding out analysis at higher real interest rates and lower private investment. The full argument continues: less investment means slower physical capital accumulation, which reduces the economy's productive capacity and long-run growth rate. Always extend the chain to the LRAS or PPC.
Infrastructure spending and education investment do shift AD in the short run, but their defining long-run effect is on LRAS and potential output through higher productivity. Describing them only as AD shifters misses the core AP distinction between demand management and supply-side growth policy.
AP Macro free-response questions frequently ask you to show a policy shock in the AD-AS model and then translate the same event onto a Phillips curve diagram. Practice moving between the two graphs fluidly: an AD increase that closes a recessionary gap in AD-AS corresponds to movement up and left along the SRPC in the Phillips curve model.
The loanable funds market is a high-frequency graph task in Unit 5. Expect to draw the market, shift the demand for loanable funds due to government borrowing, identify the new equilibrium real interest rate, and then explain the consequence for private investment and long-run growth. Label all curves, axes, and equilibrium points clearly.
The quantity theory equation appears in both calculation and written-explanation tasks. You may be given three of the four variables and asked to solve for the fourth, or asked to explain why money growth causes inflation rather than real output growth in the long run. Practice both the arithmetic and the written reasoning using monetary neutrality.
Open the individual guides for Unit 5 when you want a closer review of one topic.
Use AP-style practice after you review the notes so you can check what you understand.
Practice free-response reasoning and compare your answer with scoring guidance.
Watch past review streams filtered to Unit 5 when you want a video walkthrough.
Open the Fiveable one-page unit review, then explore visual cheatsheets for a quick refresher.
Estimate your broader AP score goal after you review the course and exam format.
Print the unit cheatsheets ($3) or unit exams ($5) for Unit 5. Yours to keep, no subscription needed.
get printablesThe AP Macro Unit 5 progress check includes both MCQ and FRQ parts that test inflation, the Phillips Curve, money growth, government deficits, the national debt, crowding out, and economic growth. The MCQ section checks conceptual understanding across all 7 topics, while the FRQ section asks you to analyze policy scenarios and draw or interpret graphs. Common progress check targets include explaining the short-run vs. long-run Phillips Curve, tracing how money growth causes inflation, and showing how crowding out works. Practicing with these exact topics before the progress check is the best prep. Head to AP Macro Unit 5 for matched practice questions and study guides.
AP Macro Unit 5 FRQs most often ask you to analyze inflation and unemployment trade-offs using the Phillips Curve, show the effects of fiscal policy or monetary policy on the economy, and explain how crowding out or the national debt affects long-run growth. These questions typically require a graph, a written explanation, or both. To practice effectively, work through past FRQs that involve the AD-AS model and the Phillips Curve, then check that your graph labels and written analysis match what College Board expects. Focus especially on connecting short-run policy actions to their long-run consequences, since that link is what Unit 5 FRQs test most. Find practice FRQs and scoring guidance at AP Macro Unit 5.
The best place to find AP Macro Unit 5 practice questions, including MCQ and practice test sets, is AP Macro Unit 5. That page has multiple-choice questions and FRQ practice covering all 7 topics: fiscal and monetary policy, the Phillips Curve, money growth and inflation, government deficits, the national debt, crowding out, and economic growth. For the strongest prep, mix MCQ drills to check conceptual recall with full FRQ practice to build the written and graphing skills the exam requires. Targeting all 7 topics gives you the best coverage of this 20-30% exam weight unit.
Start AP Macro Unit 5 by locking in the short-run vs. long-run distinction: understand how fiscal policy and monetary policy affect output and inflation in the short run, then trace those effects forward using the Phillips Curve. From there, work through money growth and inflation, government deficits, the national debt, and crowding out as a connected chain, not isolated topics. Here's a practical study sequence:
1. Review the AD-AS model and short-run policy effects (Topic 5.1).
2. Learn both the short-run and long-run Phillips Curve and what shifts each (Topic 5.2).
3. Connect money supply growth to inflation (Topic 5.3).
4. Understand how deficits add to the national debt and how crowding out reduces private investment (Topics 5.4-5.5).
5. Finish with economic growth drivers and public policy tools (Topics 5.6-5.7). Practice drawing graphs from memory, then explain each graph in writing. That combo covers both the MCQ and FRQ formats. Visit AP Macro Unit 5 for study guides and practice sets.
AP Macro Unit 5 requires four key graphs, and inflation connects all of them. You need the AD-AS model (showing how fiscal policy and monetary policy shift aggregate demand and affect the price level), the short-run Phillips Curve (the inverse relationship between inflation and unemployment), the long-run Phillips Curve (a vertical line at the natural rate of unemployment), and the loanable funds market (showing how government borrowing causes crowding out by raising interest rates and reducing private investment). On the exam, you'll often need to draw a shift, label axes and curves correctly, and explain what the graph shows in words. The most common errors are mislabeling the Phillips Curve axes and forgetting to show the long-run vertical Phillips Curve when a question asks about long-run effects. Practice all four graphs at AP Macro Unit 5.