AP Macroeconomics Economic Indicators and the Business Cycle — Worked Answer Explanations

Unit 2 · 12 questions explained

Below is a complete answer key for our AP Macroeconomics Economic Indicators and the Business Cycle practice questions. For each question you'll find the correct choice, a full written explanation of how to get there, and — for every wrong answer — a short note on exactly why it's tempting and where it goes wrong. Reading these straight through is one of the fastest ways to find the gaps in a unit before exam day.

Prefer to test yourself first? Take the timed Economic Indicators and the Business Cycle practice test and come back here to review, or head back to the Economic Indicators and the Business Cycle unit overview.

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Question 1 · Easy
A country's GDP is $500 bi l l i o ninY e a r 1 an d$ 550 billion in Year 2, both measured in Year 1 prices. The general price level rose 4% between Year 1 and Year 2. What is the real GDP growth rate?
- A
  4%
  Why not A: 4% is the inflation rate, not the real GDP growth rate; real growth removes the price-level increase.
- B
  10%Correct
- C
  6%
  Why not C: 6% would result from subtracting the inflation rate from nominal growth incorrectly; the question states Year 2 GDP is already measured in Year 1 (constant) prices.
- D
  14%
  Why not D: 14% comes from adding the inflation rate to the GDP change, which double-counts the price increase.
Explanation
Since both figures are in Year 1 prices (constant prices), no deflation adjustment is needed. Real GDP growth = $\frac{550 - 500}{500} \times 100% = \frac{50}{500} \times 100% = 10%$ . The 4% inflation rate is already accounted for by the use of constant prices.

Key takeaway
Real GDP is measured in constant prices. Growth rate = $\frac{\Delta \text{Real GDP}}{\text{Base Real GDP}} \times 100\%$.
Question 2 · Easy
Which of the following is counted in U.S. GDP using the expenditure approach?
- A
  A used car sold at a dealership for $8,000.
  Why not A: Used goods represent previously counted production; reselling them does not add new output to current GDP.
- B
  A new house built and purchased by a family for $300,000.Correct
- C
  A Social Security payment of $1,200 received by a retiree.
  Why not C: Transfer payments redistribute income without creating new output; they are excluded from GDP.
- D
  Steel purchased by Ford to manufacture new cars.
  Why not D: Intermediate goods (inputs used in further production) are excluded to avoid double counting; only final goods count.
Explanation
GDP counts only final goods and services produced in the current period. New residential construction is a final investment good counted under gross private domestic investment ( $I$ ). Used goods, transfer payments, and intermediate inputs are all excluded.

Key takeaway
GDP = C + I + G + NX. New residential construction = investment (I). Exclude: used goods, transfers, intermediate inputs.
Question 3 · Easy
A worker loses her job at a coal mine because the nation has shifted to renewable energy, making coal uneconomical. This worker is experiencing which type of unemployment?
- A
  Frictional unemployment
  Why not A: Frictional unemployment occurs during the normal job-search process between jobs, not from a permanent industry decline.
- B
  Cyclical unemployment
  Why not B: Cyclical unemployment results from economic downturns in the business cycle, not from permanent technological or structural changes.
- C
  Structural unemploymentCorrect
- D
  Seasonal unemployment
  Why not D: Seasonal unemployment results from predictable seasonal demand changes (e.g., ski instructors in summer), not from permanent economic restructuring.
Explanation
Structural unemployment occurs when changes in the structure of the economy — technology, consumer preferences, or resource depletion — make certain skills or industries permanently obsolete. A coal miner displaced by renewable energy faces a mismatch between her skills and available jobs, the hallmark of structural unemployment.

Key takeaway
Structural unemployment stems from permanent skill or industry mismatches. Frictional = job search in transition. Cyclical = recession-driven. Seasonal = predictable calendar patterns.
Question 4 · Easy
Which phase of the business cycle is characterized by falling real GDP, rising unemployment, and decreasing business investment?
- A
  Expansion
  Why not A: During an expansion, real GDP rises, unemployment falls, and investment increases — the opposite of the described conditions.
- B
  Peak
  Why not B: The peak is the turning point at maximum real GDP before decline; GDP is not yet falling at the peak.
- C
  Recession (contraction)Correct
- D
  Trough
  Why not D: The trough is the lowest point of the cycle, after which recovery begins; the trough itself is a turning point, not the ongoing process of decline.
Explanation
A recession (contraction) is defined as two or more consecutive quarters of falling real GDP. It is marked by declining real output, rising unemployment, falling consumer spending, and decreasing business investment. It begins at the peak and ends at the trough.

Key takeaway
Business cycle phases: expansion → peak → recession (contraction) → trough → recovery. Recession = falling GDP + rising unemployment.
Question 5 · Easy
The labor force participation rate is 60% and the unemployment rate is 5%. If the working-age population is 200 million, how many people are unemployed?
- A
  6 millionCorrect
- B
  10 million
  Why not B: 10 million = 5% of 200 million, but the 5% rate applies to the labor force (120 million), not the full working-age population.
- C
  3 million
  Why not C: This might come from applying 5% to 60 million rather than 120 million, mixing up the participation rate calculation.
- D
  12 million
  Why not D: 12 million is 10% of the labor force, not 5%.
Explanation
Labor force = $200 M \times 0.60 = 120$ million. Unemployed = $120 M \times 0.05 = 6$ million. The unemployment rate is defined as unemployed ÷ labor force, so it must be applied to the labor force, not the full working-age population.

Key takeaway
Unemployment rate = $\frac{\text{unemployed}}{\text{labor force}}$. Apply the rate to the labor force, not the working-age population.
Question 6 · Easy
The CPI in Year 1 is 120 and in Year 2 is 126. A worker earned a nominal wage of $50,000 in Year 1. What nominal wage in Year 2 is required to maintain the same purchasing power?
- A
  $52,500Correct
- B
  $50,000
  Why not B: An unchanged nominal wage means the worker's real wage fell by 5%, reducing purchasing power.
- C
  $53,000
  Why not C: This slightly overestimates; the exact 5% CPI increase requires a 5% nominal wage increase, yielding $52,500.
- D
  $54,600
  Why not D: 54,600 = 50,000 × (126/120) × some error; 50,000 × 1.05 = 52,500, not 54,600.
Explanation
Inflation rate = $\frac{126 - 120}{120} \times 100% = 5%$ . To maintain real purchasing power, the nominal wage must rise by the same percentage: $\$ 50{,}000 \times 1.05 = $52, 500$ . Equivalently, $\$ 50{,}000 \times \frac{126}{120} = $52, 500$ .

Key takeaway
To maintain real purchasing power, nominal wages must rise by the inflation rate: $\text{Nominal}_{\text{new}} = \text{Nominal}_{\text{old}} \times \frac{\text{CPI}_{\text{new}}}{\text{CPI}_{\text{old}}}$.
Question 7 · Easy
Nominal GDP in Year 2 is $800 billion. The GDP deflator for Year 2 is 125 (base year = 100). What is real GDP in Year 2?
- A
  $1,000 billion
  Why not A: 1,000 = 800 × 1.25; this multiplies by the deflator instead of dividing, converting in the wrong direction.
- B
  $640 billionCorrect
- C
  $675 billion
  Why not C: This does not follow the deflator formula; the correct calculation is 800/1.25 = 640.
- D
  $800 billion
  Why not D: 800 billion is nominal GDP; real GDP adjusts for price changes using the deflator, so it differs when the deflator ≠ 100.
Explanation
$\text{Real GDP} = \frac{\text{Nominal GDP}}{\text{GDP Deflator}} \times 100 = \frac{\$ 800\text{B}}{125} \times 100 = $640$ billion. Dividing by a deflator greater than 100 shrinks nominal GDP to reflect that some growth was due to rising prices, not real output.

Key takeaway
$\text{Real GDP} = \frac{\text{Nominal GDP}}{\text{GDP Deflator}} \times 100$. Deflator > 100 means prices rose; real GDP < nominal GDP.
Question 8 · Easy
Which of the following is NOT a limitation of GDP as a measure of economic well-being?
- A
  GDP excludes the value of household production and volunteer work.
  Why not A: This is a genuine limitation — non-market productive activity (home cooking, child-rearing) is excluded from GDP, understating well-being.
- B
  GDP measures total market value of all final goods and services produced.Correct
- C
  GDP does not account for income distribution or inequality.
  Why not C: This is a genuine limitation — a high GDP can mask severe inequality if income is concentrated at the top.
- D
  GDP includes spending on pollution cleanup, which may reflect harm rather than welfare.
  Why not D: This is a genuine limitation — defensive expenditures count positively in GDP even though they correct negative outcomes.
Explanation
GDP's definition — total market value of all final goods and services produced within a country in a given period — is what GDP measures, not a limitation. The three other options are well-recognized shortcomings: non-market activities are excluded, income inequality is ignored, and defensive expenditures are counted as additions.

Key takeaway
GDP limitations: excludes household/volunteer production, ignores inequality, counts defensive spending as positive. GDP's definition is not a limitation.
Question 9 · Easy
The natural rate of unemployment consists of which two types of unemployment?
- A
  Cyclical and structural unemployment
  Why not A: Cyclical unemployment reflects slack from recessions and is absent at full employment; it is not part of the natural rate.
- B
  Frictional and structural unemploymentCorrect
- C
  Frictional and cyclical unemployment
  Why not C: Cyclical unemployment is caused by downturns in the business cycle and is eliminated at full employment; only frictional and structural make up the natural rate.
- D
  Seasonal and structural unemployment
  Why not D: Seasonal unemployment is often treated as a subset of frictional; structural is correct, but the standard pairing for the natural rate is frictional + structural.
Explanation
The natural rate of unemployment (NRU) is the rate that exists when the economy is at full employment — i.e., when cyclical unemployment is zero. It consists of frictional unemployment (normal job-search time) and structural unemployment (skill/industry mismatches). When actual unemployment = NRU, the economy is producing at potential GDP.

Key takeaway
Natural rate = frictional + structural unemployment. Cyclical unemployment is zero at full employment. Actual unemployment > NRU implies a negative output gap.
Question 10 · Medium
A market basket costs $200 in the base year and \$ 230 in the current year. The CPI in the current year is closest to:
- A
  115Correct
- B
  130
  Why not B: 130 would imply the basket costs 30% more, but $230/$ 200 = 1.15, a 15% increase, not 30%.
- C
  87
  Why not C: 87 ≈ 200/230 × 100, which inverts the ratio; CPI = (current cost / base cost) × 100, not the reverse.
- D
  100
  Why not D: 100 is the CPI in the base year by definition; any price increase since the base year yields CPI > 100.
Explanation
$CPI = \frac{Cost of basket in current year}{Cost of basket in base year} \times 100 = \frac{230}{200} \times 100 = 115$ . A CPI of 115 means the price level is 15% higher than in the base year.

Key takeaway
$\text{CPI} = \frac{\text{Current basket cost}}{\text{Base basket cost}} \times 100$. CPI = 100 in the base year; CPI > 100 indicates inflation since the base year.
Question 11 · Medium
During the expansion phase of the business cycle, which combination of macroeconomic trends is most likely?
- A
  Rising real GDP, falling unemployment, rising inflationCorrect
- B
  Rising real GDP, rising unemployment, falling inflation
  Why not B: Rising real GDP is correct, but expanding output typically reduces unemployment and increases inflationary pressure, not the reverse.
- C
  Falling real GDP, falling unemployment, rising inflation
  Why not C: Falling GDP is a recession trait; falling unemployment during a contraction is inconsistent with cyclical patterns.
- D
  Stable real GDP, stable unemployment, stable prices
  Why not D: Stability characterizes neither the expansion nor contraction phase; expansion involves positive changes in growth and employment.
Explanation
During an expansion, firms produce more output (real GDP rises), hire more workers (unemployment falls), and face higher demand, which typically pushes prices upward (inflation rises). This trio reflects the procyclical behavior of output and employment and the typical link between tight labor markets and rising wages/prices.

Key takeaway
Expansion: real GDP ↑, unemployment ↓, inflation ↑. Recession: real GDP ↓, unemployment ↑, inflation ↓ (or slows).
Question 12 · Medium
Real GDP per capita in Country A rose from $40,000 to \$ 42,000 over ten years. The population grew from 10 million to 12 million over the same period. Which statement best evaluates living standards?
- A
  Living standards rose because total real GDP increased.
  Why not A: Total GDP can rise due to population growth without per capita improvement; living standards are better gauged by real GDP per capita.
- B
  Living standards rose modestly — real GDP per capita increased 5% over a decade.Correct
- C
  Living standards fell because population grew faster than real GDP.
  Why not C: Real GDP per capita rose from $40, 000 t o$ 42,000, meaning output per person increased; this indicates improvement, not deterioration.
- D
  Living standards cannot be assessed without knowing the unemployment rate.
  Why not D: While unemployment data adds context, real GDP per capita is itself a direct measure of average output per person and a standard proxy for living standards.
Explanation
Real GDP per capita already adjusts for population growth, making it the appropriate living-standards measure. It rose from $40,000 to \$ 42,000 — a 5% increase ( $\frac{42 , 000 - 40 , 000}{40 , 000} \times 100 = 5%$ ) over ten years. Total GDP rose as well (from $400B to \$ 504B), but that partly reflects population growth, not individual well-being.

Key takeaway
Real GDP per capita = real GDP ÷ population; it controls for population size and is the standard living-standards proxy.