AP Macroeconomics Unit 2 Cheat Sheet: Economic Indicators & the Business Cycle

The basics

What it covers: How economists measure the macroeconomy — GDP, unemployment, price levels, and the business cycle.

Exam weight: About 12–17% of the AP Macroeconomics exam.

The big question: How do we measure the size, health, and price level of an economy, and what do those measurements miss?

Big Ideas covered: Measurement, Real vs. Nominal values, and Economic Cycles.

Money, resources, and goods flow between households, firms, government, and the foreign sector through product markets and factor markets.

GDP = C + I + G + Nx. Only final goods count — intermediate goods are excluded to avoid double-counting.

Excludes non-market activity (unpaid work), the underground economy, and says nothing about income distribution or quality of life.

Unemployment rate = unemployed ÷ labor force. Frictional, structural, and cyclical types; natural rate = frictional + structural.

CPI tracks a fixed consumer basket; GDP deflator covers all of GDP. Inflation rate = % change in the index.

Hurts lenders, savers, fixed-income earners; helps borrowers. Unanticipated inflation redistributes purchasing power.

Real GDP = (Nominal GDP ÷ deflator) × 100. Real values strip out price-level changes to isolate actual output/value changes.

Four phases: expansion → peak → recession → trough. Real GDP, unemployment, and inflation move predictably through each phase.

GDP — total market value of all final goods and services produced within a country's borders in a given period.
Real vs. nominal GDP — real adjusts for price-level changes (constant prices); nominal uses current-year prices.
Unemployment rate — percentage of the labor force that is jobless and actively seeking work.
Frictional / structural / cyclical unemployment — short-term transition, skills/location mismatch, and business-cycle-driven unemployment, respectively.
CPI / GDP deflator — price indices used to measure inflation; CPI covers a fixed consumer basket, the deflator covers all of GDP.
Inflation rate — the percentage change in a price index from one period to the next.
Business cycle phases — expansion, peak, recession/contraction, and trough.

Every measure has blind spots. GDP misses non-market work and the underground economy; the unemployment rate misses discouraged workers.
Nominal numbers can be misleading. Always ask whether a change reflects actual output/value growth or just rising prices — that's why "real" measures exist.
The natural rate of unemployment is not zero. Full employment still includes frictional and structural unemployment — only cyclical unemployment goes to zero.
The business cycle is the heartbeat behind every other unit. Where the economy sits in the cycle shapes which policies (Units 3 and 5) make sense.

Don't confuse the unemployment rate with the labor force participation rate. The unemployment rate is a fraction of the labor force; participation rate is the labor force as a fraction of the total population.
Discouraged workers are NOT counted as unemployed. They've stopped looking for work, so they're excluded from the labor force entirely — this can make the unemployment rate understate true joblessness.
"Investment" in GDP means capital goods spending, not buying stocks. Don't fall for answer choices that describe financial investment.
A recession is not just "GDP fell once." The common definition requires at least two consecutive quarters of declining real GDP.
Real values, not nominal, are what matter for comparing across time. If a question gives you nominal GDP for two different years, you almost always need to adjust using a price index before comparing.