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Macroeconomics: Measuring and Managing the Economy

Learn GDP, inflation, unemployment, the business cycle, fiscal and monetary policy, and trade—and how to read the data the GED uses.

Practice this skill 22 min Macroeconomics Leer en español
Key idea

What you'll learn

In plain words: Macroeconomics looks at the whole country's economy, not just one business.

Macroeconomics looks at the economy as a whole — the whole country's output, prices, and jobs. In this lesson you will learn:

  • how economists measure the economy (GDP, inflation and the CPI, unemployment);
  • how the economy moves through the business cycle;
  • how the government responds with fiscal policy (Congress and the President) and monetary policy (the Federal Reserve);
  • the basics of international trade and tariffs.

How the GED tests this: Expect short passages, tables, and graphs such as:

  • a business-cycle diagram where you identify a phase,
  • a CPI table where you calculate an inflation rate,
  • a passage about the Fed where you trace cause and effect,
  • a table of GDP and unemployment where you compare trends,
  • a scenario about a tariff where you decide who wins and who loses.

Many items use simple math — percent change most of all. So the calculator is often available. Just as often, the question checks two skills. Can you tell fiscal policy from monetary policy? Can you tell a falling inflation rate from falling prices?

Words to know

Key terms

  • gross domestic product (GDP) — the market value of all final goods and services newly produced within a country in a year.
  • real GDP — GDP adjusted for inflation, so it measures changes in actual output.
  • business cycle — the repeated rise and fall of economic activity: expansion, peak, contraction, trough.
  • recession — a significant, widespread decline in economic activity lasting more than a few months.
  • inflation — a general rise in the price level (inflation of 3% means prices are 3% higher than a year ago).
  • deflation — a general fall in the price level.
  • disinflation — a slowdown in the inflation rate (prices still rising, just more slowly).
  • Consumer Price Index (CPI) — a measure of the average price of a basket of goods and services households buy.
  • purchasing power — how much a dollar can buy.
  • nominal vs. real — nominal is measured in current dollars; real is adjusted for inflation.
  • unemployment rate — unemployed people looking for work ÷ labor force × 100.
  • labor force — people who have a job or are actively looking for one.
  • fiscal policy — government spending and taxing decisions by Congress and the President.
  • budget deficit — when the government spends more than it collects in a year. National debt — the total of all past borrowing.
  • monetary policy — the Federal Reserve's management of interest rates and the money supply.
  • Federal Reserve (the Fed) — the central bank of the United States, created in 1913.
  • federal funds rate — the interest rate banks charge each other for overnight loans; the Fed sets a target for it.
  • tariff — a tax on imported goods. Quota — a limit on the amount of a good that can be imported.
  • trade deficit — when a country imports more than it exports.

All Social Studies words in the glossary

Measuring the economy: GDP, inflation, and unemployment

In plain words: GDP tells how much the country makes. The CPI tells how fast prices rise. The unemployment rate tells how many job seekers can't find work.

GDP is the broadest measure of a nation's output. Think of it as the country's total sales receipt for one year. One way to add it up is by spending:

\text{GDP} = C + I + G + (X - M)

where C = consumer spending, I = business investment (new equipment, buildings, homes), G = government purchases, and X - M = exports minus imports. Consumer spending is by far the largest part of U.S. GDP — roughly two-thirds.

Circular flow diagram. Households and firms are linked by two markets. In the product market, firms sell goods and services to households, and households pay spending, which is firm revenue. In the factor market, households sell labor, land and capital to firms, and firms pay wages, rent and profits, which is household income. Goods and resources flow one way and money flows the other way, in a loop. The circular flow of the economy Households Firms Product market goods and services Factor market labor, land, capital goods & services goods & services $ spending $ revenue labor, land, capital resources $ wages, rent, profits $ income Solid arrows: goods and resources Dashed green arrows: money

What GDP leaves out:

  • used goods (they were counted when first made);
  • stocks and bonds (these are financial trades, not new products);
  • unpaid work at home (cooking your own dinner);
  • goods made in other countries (imports).

Inflation and the CPI. The Bureau of Labor Statistics tracks the prices of a "basket" of items households buy. The basket holds food, housing, gasoline, medical care, and more. The result is the Consumer Price Index. The yearly inflation rate is the percent change in the CPI.

Example: CPI 271.0 (2021) → 292.7 (2022): \dfrac{292.7 - 271.0}{271.0} \times 100 \approx 8.0\%.

Inflation reduces purchasing power — what your dollar can buy. Say your pay rises 5% but prices rise 8%. Your real pay falls. You earn more dollars, but they buy less. Low, steady inflation is considered healthy. The Fed aims for about 2% per year. Very high inflation causes problems. So does deflation.

Unemployment. The unemployment rate counts only people who are looking for work. There are four types:

  • Frictional — between jobs or just entering the workforce (a graduate searching for a first job).
  • Structural — skills don't match the jobs available. This often comes from changes in technology or industry (a coal miner when mines close).
  • Cyclical — caused by recessions. It rises when the economy shrinks.
  • Seasonal — tied to seasons (ski instructors in summer).

The business cycle

In plain words: The economy grows over time, but in waves: up, top, down, bottom, and up again.

The economy grows over the long run, but not smoothly. Think of a hiking trail up a mountain. It has many ups and downs, but over time it climbs higher.

PhaseWhat happensTypical signs
ExpansionOutput risesHiring, rising incomes, falling unemployment
PeakOutput stops risingVery low unemployment; inflation may speed up
ContractionOutput falls; called a recession if significant and lastingLayoffs, rising unemployment, falling sales
TroughOutput stops fallingUnemployment near its highest; recovery begins
Business cycle graph of real output over time. A wavy line rises and falls around an upward-sloping long-run trend line. Labels mark expansion while output rises, a peak at the top, contraction or recession while output falls, a trough at the bottom, then expansion again. Illustrative, not real data. The business cycle Time Real GDP (output) Peak Trough Peak Trough Expansion Contraction Expansion Contraction Dashed line = long-run growth trend. Illustrative shape, not real data.

Example: The Great Recession had its peak in December 2007. Its trough came in June 2009. Real GDP fell 2.6% in 2009.

Leading and lagging. After a recovery starts, unemployment usually keeps rising for a while. Employers wait to be sure business will last before they hire. So unemployment is a lagging indicator — it changes after the economy changes. In 2010, real GDP grew 2.7%. Yet unemployment reached 9.6%, higher than in 2009.

A depression is an unusually long, severe contraction. The Great Depression of the 1930s is the U.S. example.

Fiscal policy and monetary policy

In plain words: Fiscal policy is about taxes and government spending. Monetary policy is about interest rates and money. Different people control each one.

Fiscal policyMonetary policy
WhoCongress and the PresidentFederal Reserve
ToolsGovernment spending, taxesFederal funds rate target, buying/selling bonds, other lending tools
To fight a recession (expansionary)Increase spending, cut taxesLower interest rates, buy bonds (add money)
To fight inflation (contractionary)Cut spending, raise taxesRaise interest rates, sell bonds (remove money)

How monetary policy works (the chain):

  1. The Fed lowers interest rates.
  2. Loans for cars, homes, and businesses get cheaper.
  3. People and firms borrow and spend more.
  4. Businesses hire more workers.
  5. Output and jobs grow.
Flowchart of how expansionary monetary policy works: 1, the Fed lowers interest rates; 2, loans for cars, homes and businesses get cheaper; 3, people and firms borrow and spend more; 4, businesses hire more workers; 5, output and jobs grow. Raising rates runs the chain in reverse and cools inflation. How a Fed rate cut spreads through the economy 1. Fed lowers interest rates 2. Loans get cheaper 3. Borrowing and spending rise 4. Businesses hire more 5. Output and jobs grow Raising rates runs the chain in reverse and cools inflation.

Raising rates works in reverse and cools inflation. Example: If car-loan rates rise, monthly payments rise. Many families wait to buy a car.

The Fed's dual mandate: Its two jobs are maximum employment and stable prices. The Fed acts independently. The President appoints its leaders, and the Senate confirms them. But the Fed does not need approval from Congress for each rate decision.

Historical examples:

  • Early 1980s: Fed Chair Paul Volcker raised interest rates to very high levels to crush 1970s inflation. A recession followed, but inflation fell.
  • 2008–2009: The Fed cut rates to nearly zero, and Congress passed a large stimulus.
  • 2022–2023: Inflation was near 8%, so the Fed raised rates rapidly. Inflation slowed to about 4% in 2023.

Deficits and debt: Expansionary fiscal policy often means borrowing. Each year's deficit adds to the national debt. Think of a credit card. Each month you overspend (a deficit) adds to your total balance (the debt).

Trade, tariffs, and interest rates in the world economy

In plain words: Countries trade so each can make what it is best at. Tariffs make imported goods cost more.

Countries trade because of comparative advantage. Each can specialize in what it produces at the lowest opportunity cost.

Trade barriers:

  • A tariff is a tax on imports. It raises the price of foreign goods.
  • A quota limits how much of a good can be imported.
  • An embargo bans trade with a country.

Who wins and loses from a tariff?

WinnersLosers
Domestic producers of the protected good and their workersConsumers, who pay higher prices
The government (tariff revenue)Domestic industries that use the good as an input (car makers using steel)
Exporters hurt when other countries retaliate (farmers)

Example: A 25% tariff on $800 steel raises the imported price by 0.25 × $800 = $200. The new price is $1,000 per ton.

Stacked bar showing a 25 percent tariff on imported steel. Import price 800 dollars per ton plus tariff of 0.25 times 800, which is 200 dollars, gives a new price of 1,000 dollars per ton. A 25% tariff on $800 steel $0 $200 $400 $600 $800 $1,000 Price per ton Import price $800 Tariff $200 New price $1,000 0.25 × $800 = $200

History to know: The Smoot-Hawley Tariff (1930) raised U.S. tariffs sharply. Other countries retaliated, and world trade shrank sharply. This helped deepen the Great Depression. Since World War II, the United States has generally pushed for lower tariffs through trade agreements. One example is NAFTA (1994). It was replaced by the United States–Mexico–Canada Agreement (USMCA) in 2020.

Trade balance: When imports are bigger than exports, a country has a trade deficit. The United States has run trade deficits most years since the 1970s.

Formula

Calculations to know

\text{Inflation rate} = \dfrac{\text{CPI}_{\text{this year}} - \text{CPI}_{\text{last year}}}{\text{CPI}_{\text{last year}}} \times 100 \text{Unemployment rate} = \dfrac{\text{unemployed}}{\text{labor force}} \times 100 \text{Real value} = \text{nominal value} \times \dfrac{\text{CPI}_{\text{base year}}}{\text{CPI}_{\text{current year}}} \text{Price with tariff} = \text{import price} \times (1 + \text{tariff rate})

Quick real-pay check: if pay rises by a smaller percent than prices, real pay falls.

Worked example

Example 1: Calculating an unemployment rate

Source: A town has 40,000 adults. 30,000 are in the labor force; 1,800 of them are unemployed and looking for work.

Question: What is the town's unemployment rate?

Think-aloud:

  1. The rate uses the labor force, not all adults: \dfrac{1{,}800}{30{,}000} \times 100 = 6\%.
  2. Trap: \dfrac{1{,}800}{40{,}000} \times 100 = 4.5\% uses all adults, including retirees and students who are not looking for work.
  3. Another trap: 1,800 ÷ 28,200 (dividing by employed only).
Nested boxes for a town. All adults: 40,000. Inside it, the labor force: 30,000. Inside that, the unemployed who are looking for work: 1,800. The unemployment rate is 1,800 divided by 30,000, which is 6 percent. The 10,000 adults outside the labor force, such as retirees and students, are not counted. Who counts in the unemployment rate? All adults: 40,000 Not in labor force: 10,000 (retirees, students…) Labor force: 30,000 Employed: 28,200 Unemployed 1,800 Rate = 1,800 30,000 = 6%

Answer: 6%.

Worked example

Example 2: Choosing the right policy

Source: "Inflation has risen to 7% for the year. Unemployment is 3.5%, a historic low."

Question: Which action would the Federal Reserve most likely take?

Think-aloud:

  1. Diagnose: high inflation + very low unemployment → the economy is overheating.
  2. Prescribe: contractionary monetary policy → raise interest rates (or sell bonds).
  3. Eliminate: "lower interest rates" (would add fuel to inflation); "raise taxes" (fiscal, not the Fed); "increase government spending" (fiscal and expansionary).

Answer: The Fed raises its target for the federal funds rate.

Worked example

Example 3: Reading CPI data

Source: CPI: 2019 = 255.7, 2020 = 258.8, 2021 = 271.0.

Question: In which year was inflation lower, 2020 or 2021, and by about how much?

Think-aloud:

  1. 2020: \dfrac{258.8 - 255.7}{255.7} \times 100 \approx 1.2\%.
  2. 2021: \dfrac{271.0 - 258.8}{258.8} \times 100 \approx 4.7\%.
  3. 2020 was lower by about 4.7 - 1.2 = 3.5 percentage points.
  4. Trap: comparing raw index changes (3.1 vs. 12.2 points) gives the right direction but not a percent.
Line graph of the Consumer Price Index: 255.7 in 2019, 258.8 in 2020, 271.0 in 2021, and 292.7 in 2022. Yearly inflation was about 1.2 percent in 2020, about 4.7 percent in 2021, and about 8.0 percent in 2022. The steeper the line, the higher the inflation. Consumer Price Index, 2019–2022 250 260 270 280 290 300 2019 2020 2021 2022 Year CPI 255.7 258.8 271.0 292.7 +1.2% +4.7% +8.0% Red = inflation that year

Answer: 2020, by about 3.5 percentage points. (Spending fell during the 2020 pandemic recession, which held prices down.)

Worked example

Example 4: Tariff winners and losers

Source: "A country places a 30% tariff on imported washing machines. Domestic appliance factories add shifts. Prices of washing machines in stores rise."

Question: Which group is most likely harmed?

Think-aloud:

  1. The tariff raises the price of imports and, as the source says, store prices rise.
  2. Domestic factories gain (they added shifts). The government collects tariff revenue.
  3. Households buying washing machines pay more—they are harmed.
  4. Eliminate "domestic factory workers" (they gained shifts) and "the government" (it collects revenue).

Answer: consumers who buy washing machines.

Common mistake

Common traps

  • Fiscal vs. monetary. Wrong: "The Fed cut taxes." Right: taxes and spending are fiscal (Congress and the President); interest rates are monetary (the Fed).
  • Disinflation vs. deflation. Wrong: "Inflation fell from 8% to 4%, so prices fell." Right: prices still rose 4%—just more slowly.
  • Wrong policy direction. Wrong: "To fight a recession, raise interest rates." Right: lower rates and/or increase spending to fight a recession; raise rates to fight inflation.
  • Points vs. percent with the CPI. Wrong: "CPI rose 21.7, so inflation was 21.7%." Right: divide the change by the earlier CPI: about 8.0%.
  • What counts in GDP. Wrong: counting used cars, stock purchases, or imports. Right: only new, final goods and services produced inside the country.
  • Nominal vs. real. Wrong: "My pay went up 5%, so I'm 5% better off." Right: subtract inflation's effect—if prices rose 8%, real pay fell.
Test strategy

GED strategy for macroeconomics

  • Identify the actor first. Congress/President → fiscal. Federal Reserve → monetary.
  • Diagnose, then prescribe. Decide whether the data show a recession (falling GDP, rising unemployment) or overheating (high inflation), then choose expansionary or contractionary tools.
  • Read table headings and units. Is the number a growth rate, a level, or an index? A negative growth rate means output fell.
  • Percent change: divide by the earlier value. Estimate first so you can catch calculator slips.
  • Follow the cause-and-effect chain in passages about the Fed or tariffs. Check that every arrow points the right way.
  • For tariff questions, list winners and losers before reading the choices.
  • Watch for "always." Economic relationships are tendencies, not laws.

Check yourself

Macroeconomics
The Business Cycle

The economy does not grow at a steady pace. Over time, real GDP—the total value of goods and services produced, adjusted for inflation—rises and falls around a long-term growth trend. This pattern is called the business cycle. The graph shows one cycle, with five points labeled A through E.

Business cycle graph. Real GDP is on the vertical axis and time on the horizontal axis. A wavy line rises and falls around a dashed upward-sloping long-term growth trend. Point A is on a rising section; point B is the highest point of the wave; point C is on the falling section after B; point D is the lowest point of the wave; point E is on the rising section after D. The Business Cycle Real GDP (total output) Time Long-term growth trend A B C D E

Point C on the graph is located in which phase of the business cycle?

Answer choices
Hint

Is the line going up or down at point C? It sits between the highest point (B) and the lowest point (D).

Check yourself

Macroeconomics

Gross domestic product (GDP) is the market value of all final goods and services newly produced within a country's borders in a given year.

Which of the following would be counted in U.S. GDP for this year?

Answer choices
Hint

Ask two questions about each choice: Was it newly produced this year? Was it produced inside the United States?

Summary

  • GDP measures new, final output inside a country; real GDP adjusts for inflation.
  • The CPI tracks prices; the inflation rate is the CPI's percent change. Falling inflation (disinflation) is not falling prices (deflation).
  • The business cycle moves through expansion, peak, contraction (recession), and trough; unemployment often lags behind output.
  • Fiscal policy (spending, taxes) belongs to Congress and the President; monetary policy (interest rates, money supply) belongs to the Federal Reserve.
  • Fight recessions with expansionary tools (spend more, cut taxes, lower rates); fight inflation with contractionary tools (raise rates, cut spending).
  • Tariffs help domestic producers of the protected good but raise prices for consumers and users of that good, and can trigger retaliation.
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