What Is Economic Growth? Definition and Measurement

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Economic growth is an increase in an economy’s output of goods and services in one period compared with an earlier period. It is usually measured as the percentage change in gross domestic product (GDP) or gross national product (GNP), and it can be stated in nominal terms (current prices) or real terms (adjusted for inflation). When economists or news reports say “the economy grew 2%,” they almost always mean real GDP rose 2% over a stated period. That figure describes production, not prices, wealth or how widely the gains are shared.

Every growth figure depends on three choices: the measure of output, whether it is adjusted for inflation, and which periods are compared. Two correct numbers for the same economy can differ simply because one is annualized from a single quarter and the other compares a full year with the year before.

How Economic Growth Works

At the aggregate level, growth means the economy produces more than it did before. Higher production generally shows up as higher national income, because every dollar spent on output is received by someone as wages, profits, rent or interest. Higher total output often coincides with higher productivity per worker, but output can also rise simply because more people are working.

Economists commonly model growth as a function of four inputs:

• Physical capital: machines, buildings, vehicles, infrastructure and other tools.
• Labor: the number of people working and the hours they work.
• Human capital: the skills, education and experience of those workers.
• Technology: the methods, or “recipes,” for combining labor, capital and raw materials into output.

Increasing the quantity or quality of any of these, holding the others constant, raises the economy’s capacity to produce. The inputs overlap with the classic factors of production, but growth models focus on how those factors expand and how efficiently they are combined over time.

Two broad paths follow from this. Extensive growth comes from adding more inputs, such as more workers or more machines. Intensive growth comes from getting more output from the same inputs, through better technology, organization or skills. Extensive growth has natural limits because the population and the stock of resources are finite; intensive growth is what allows output per person to keep rising over long periods.

Measuring Economic Growth

Real GDP as the core measure

The core measure of economic growth is real GDP: the total market value of all final goods and services produced within a country, adjusted to remove the effect of inflation. Using the expenditure approach:

GDP = consumer spending + business investment + government spending + net exports

(Net exports are exports minus imports.)

Output is added up by market value because very different products cannot be counted by quantity: a smartphone and a pair of socks are not simply “two goods.” Current market value, in dollars in the United States, is the practical way to combine them into one total.

Nominal vs. real growth

Nominal GDP is measured in current prices, so it rises when the economy produces more and also when prices go up. Real GDP holds prices constant, so it isolates the change in quantity produced.

Hypothetical example: an economy’s nominal GDP rises from $1,000 billion to $1,060 billion, a 6% increase. Over the same period, the overall price level for its output (the GDP deflator) rises 4%.

Real growth = (1.06 ÷ 1.04) − 1 ≈ 0.0192, or about 1.9%

A common shortcut subtracts inflation from nominal growth (6% − 4% = 2%), which is close when both numbers are small. Here, more than two-thirds of the headline increase came from higher prices rather than more output. The GDP deflator covers all domestically produced output, so it will not match the Consumer Price Index, which tracks a basket of consumer purchases.

Three ways to state a growth rate

Real GDP growth for the same economy can be expressed in several ways:

1. Quarterly growth at an annual rate. The change from one quarter to the next is compounded as if it continued for a full year: annualized rate = (1 + quarterly rate)^4 − 1. A 0.3% quarterly increase becomes roughly 1.2% at an annual rate. U.S. quarterly GDP headlines are reported this way, which is why a single strong or weak quarter can look dramatic.
2. Four-quarter (year-over-year) growth. This compares one quarter with the same quarter a year earlier. Businesses often use it because comparing like seasons with like seasons reduces seasonal distortions.
3. Annual-average growth. This compares the average level of real GDP across all of one year with the average level across the previous year. It smooths out quarter-to-quarter swings but responds slowly to turning points.

In a year when the economy accelerates late, the year-over-year rate for the fourth quarter can be well above the annual-average rate, even though both are correct. Comparing a quarterly annualized figure from one country with a year-over-year figure from another mixes different measures.

Per capita growth and alternative measures

Total GDP can grow simply because the population grows. Dividing GDP by population gives GDP per capita, and its growth rate approximately equals real GDP growth minus population growth. Hypothetical example: if real GDP rises 2.5% while the population rises 1.5%, output per person grows only about 1%.

GNP measures output by a country’s residents wherever they produce it, rather than output produced within its borders. The World Bank uses gross national income (GNI) per capita, which includes income earned abroad and sent home, to classify countries for analytical purposes and to determine borrowing eligibility. When comparing living standards across countries, analysts often convert figures using purchasing power parity, which adjusts for differences in what a dollar buys in each economy.

How small rates compound

Growth rates look small, but they compound. The rule of 70 approximates how long an economy takes to double: doubling time ≈ 70 ÷ annual growth rate (in percent). At a steady 1% a year, output doubles in about 70 years; at 3.5%, in about 20 years; at 7%, in about 10 years. Over a few generations, a difference of one or two percentage points per year separates economies that end up several times larger from those that barely change.

What Drives Economic Growth

More physical capital

Adding capital raises the productivity of labor, because better tools let each worker produce more per hour. Two conditions apply. First, someone has to save, giving up consumption today to free resources for building capital, an example of opportunity cost. Second, the capital has to be the right type, in the right place, at the right time. A factory built where there are no workers or customers adds to measured investment without adding much useful output.

Better technology

Technology lets workers produce more with the same capital by combining resources in more productive ways. Petroleum had little economic value until gasoline put its energy to use in transport. Technical progress also depends on saving and investment, because research and development consume resources long before they pay off.

A larger labor force

More workers can produce more output; part of strong 19th-century U.S. growth came from immigrant labor. Each new worker must be productive enough to more than cover their own consumption, and needs a job that uses their skills alongside complementary capital. Labor-force growth raises total output more reliably than it raises output per person.

More human capital

Workers become more productive through training, education, experience and practice. A broader view includes social and institutional capital: social trust, norms of reciprocity and secure property rights make it easier to coordinate, invest and trade, raising the productivity of the whole economy.

Growth and the Business Cycle

Growth does not occur in a straight line. The economy moves through the business cycle, which has four phases:

• Expansion: employment, income, industrial production and sales rise, and real GDP increases.
• Peak: the expansion reaches its high point and turns.
• Contraction: those same measures decline. When a significant decline spreads across the economy, it is a recession.
• Trough: the contraction hits bottom and activity begins to recover.

Cycles vary in length. Since World War II, U.S. expansions have far outlasted contractions: from 1945 to 2019, expansions averaged about 65 months and contractions about 11. The Great Recession ran 18 months, from December 2007 to June 2009, and was followed by the longest expansion on record, 128 months, which ended in 2020 with the COVID-19 pandemic.

This creates a distinction between actual growth, the change in real GDP from period to period, and potential growth, the rate at which the economy’s capacity to produce rises over time. In a recovery, actual growth can exceed potential growth for a while as idle workers and factories are put back to use. Once the economy is near full capacity, sustained growth depends on the long-run drivers above.

Policy can influence the short-run path. Central banks can lower interest rates to make borrowing cheaper and encourage spending and investment, but they eventually raise rates to contain inflation when demand outruns capacity, as the Federal Reserve did in 2022 and 2023.

Taxes and Economic Growth

In the short term, taxes affect growth mainly through demand: a tax cut raises disposable income and can encourage hiring and investment. The Congressional Budget Office (CBO) has estimated the effect is about three times larger when the economy is well below potential than when it is near capacity. It has also found that tax cuts generally stimulate less than equal increases in government spending, because part of a tax cut is saved. Targeting cuts to lower- and middle-income households, who save less of the extra income, strengthens the demand effect.

Why Economic Growth Matters

Growth means more output is available to more people, which can fund higher wages, more public services and debt repayment without cutting other spending. Research from the United Nations University World Institute for Development Economics Research found that most countries that reduced poverty and expanded access to public goods did so on the basis of strong growth. It also found that growth is unlikely to be sustained if its benefits flow only to a narrow elite.

For investors and businesses, growth shapes demand. Rising output and incomes generally support sales and corporate earnings, and industries tied to investment, construction and consumer spending tend to be the most sensitive to the cycle. Strong growth can also bring higher interest rates if it pushes up inflation.

Limitations of Economic Growth as a Measure

GDP-based growth figures are useful for size and direction, but they leave out several things that affect well-being:

• Distribution. Average output can rise while many households see little or no income gain.
• Non-market activity. Unpaid household work, caregiving and volunteering are not counted, and informal or unreported activity is only partly captured.
• Environmental cost. Depleting resources or polluting adds to measured output today without subtracting the loss of natural capital.
• Quality and new products. Price indexes struggle to capture quality improvements and new goods, which can understate real growth.
• What output is for. Spending to repair disaster damage adds to GDP even though it only restores what existed before.
• Leisure. An economy that produces the same output with fewer working hours is better off, but GDP does not count that gain.

Economic Growth vs. Economic Development

Economic growth is a quantitative change: more output, measured by GDP, GNP or GNI. Economic development is a broader, qualitative change in living conditions, including health, education, life expectancy, infrastructure, institutions and poverty reduction. Growth usually supplies the resources for development, but an economy can grow through resource extraction or a narrow industry while health and education barely improve. Rapid growth also tends to bring social change, such as movement from farms to cities and shifts toward industry and services.

Growth also differs from a rising stock market. Share prices reflect expectations about future corporate profits and interest rates, so an index such as the S&P 500 can rise while GDP is shrinking, or fall while the economy is expanding.

FAQs

The Bottom Line

Investors, businesses and anyone reading economic headlines should check how a growth figure was measured before comparing it with another. A quarterly annualized rate, a year-over-year rate and an annual average can all differ for the same economy. Growth figures also show the size and direction of output, but they leave out distribution, unpaid work, environmental costs and leisure, so they say little on their own about living standards.