GDP vs GNI: why economic growth may not show up in your pay

Count the grain in the bread once

Follow a farmer’s grain into a mill, then the mill’s flour into a bakery. Adding every sale would count the grain again in the flour and again in the bread. GDP, short for gross domestic product, measures the value of final goods and services made within an economy during a period. One way to calculate it is to count what each producer adds beyond materials and services bought from other businesses. That extra value is called value added. Product taxes and subsidies require their own adjustment in the full calculation.

For the invented one-year bread economy below, all production happens within the economy and households buy all the finished bread. “Output sold” is each producer’s sales value. “Intermediate inputs” are the materials and services bought and used to make it. Subtracting those inputs gives value added. There are no other such inputs, imports, product taxes, subsidies or changes in unsold stock. KRW means South Korean won; the table’s unit is KRW 10,000.

On a narrow screen, scroll the tables sideways to see every column.

The bread contains the earlier grain and flour. Subtracting intermediate inputs leaves 30 + 40 + 50 = 120, matching final household purchases of KRW 1,200,000. Turnover summed across producers is larger because it includes those earlier sales.

The value added still has to cover workers’ pay and other income created in production. It is not simply the owner’s net profit, meaning profit after all the relevant costs.

“Gross” also means capital depreciation has not been deducted. Depreciation here measures the value used up as equipment and other lasting assets wear out or become obsolete. The distinction differs from a company's revenue and profit measures.

Who receives the income from production?

Imagine an overseas-owned factory making things inside this economy. Its production enters this economy’s GDP because of where it happens. Some of the income may belong to owners outside it. GNI, or gross national income, asks about income belonging to this economy’s residents instead. For these statistics, residence is an economic connection to a place, rather than citizenship. Residents include households, businesses and government bodies.

The relevant income includes pay for work, interest paid for lending money, and dividends, meaning company profits shared with owners. Together these are part of primary income: income from taking part in production or providing assets. Money earned by a directly owned overseas business and left there to invest again can count too; it is called reinvested earnings. So the income need not arrive as cash sent home. Money an overseas family member sends as support is a transfer, rather than primary income simply because it crosses a border.

The next two cases are separate invented economies for one year, each using that year’s prices. Add primary income due from abroad and subtract primary income due to nonresidents: GNI = GDP + primary income receivable − primary income payable. We assume production-based GDP and income-based gross domestic income (GDI) agree exactly. There is no statistical discrepancy, meaning no gap between estimates made from their different records. Each unit in this table is KRW 100 million.

GNI can sit above or below GDP. This adjustment is not the trade balance: exports of domestic production already enter GDP. Nor does it require profits to be sent back through a bank transfer. Both measures remain gross of depreciation.

Actual production and income statistics may be estimated from different records and contain statistical discrepancies. The table sets those differences to zero. Published figures also need matching periods, price bases and stated adjustments before they can be compared.

More money from higher prices or from making more?

Selling the same number of things at a higher price increases their total money value. Making more things increases it too. Nominal GDP uses the prices of the year being measured. Real GDP separates out price changes to measure the change in how much is produced. Our next invented economy makes just one final good of unchanged quality, using year A’s price as the fixed comparison price.

The table’s GDP deflator describes the price change for this production: nominal GDP divided by real GDP, multiplied by 100.

Nominal GDP rises 15.50%, volume rises 5.00% and the price rises 10.00%. The factors multiply: 1.10 × 1.05 = 1.155. Adding the percentage changes misses their interaction.

With year A set to 100, 110 means prices are 10% higher. Official accounts cover many goods and can link changes from one period to the next, a method called chain-linking. This one-good fixed-price exercise does not reproduce those accounts.

A consumer price index follows consumer purchases, whose coverage differs from domestic production. Real GNI also involves the relationship between export and import prices, called terms of trade, and other income adjustments. Dividing the earlier nominal GNI by this toy deflator would not calculate real GNI.

GNI per person can change when the exchange rate changes

“Per capita” means per person: divide total GNI by population. Converting that average to US dollars adds the price for swapping won into dollars, or exchange rate. Each fictional annual row below is compared with the base, rather than following the previous row in time. Its stated won-per-dollar figure is an invented average for the year.

For the base, 1,030 × 100,000,000 ÷ 10,000 = KRW 10,300,000 per person. Divide by 1,000 won per dollar to get USD 10,300. A higher won-per-dollar rate means a weaker won and a smaller dollar equivalent.

In the income-and-exchange-rate scenario, total won GNI rises 10.00% from the base, while dollar GNI per person changes by -12.00%: 1.10 ÷ 1.25 = 0.88. In the final scenario, total GNI and population both rise 10%, leaving the per-person figures unchanged.

These amounts use the stated exchange rate without adjusting for price changes. They are not purchasing-power-parity (PPP) comparisons, which allow for differences in what money buys across countries, or measures of real purchasing power. They do not measure what local households can buy at local prices.

An economy-wide average is not your take-home pay

GNI includes income outside household wages, including business income. Dividing it by everyone in the population does not turn it into the median salary, which is the middle salary when people are ranked by pay, or disposable household income, the income households have after taxes and transfers. Nor is it money paid to each person.

Even if the amount produced grows after allowing for prices, the gains can go unevenly to different businesses, industries and households. Your pay also depends on your job, hours and employer’s decisions. Taxes, support payments, housing and debt payments then affect the money left to spend.

Production, income distribution and cash timing describe different parts of the picture. Keeping those measures separate also helps when a company's profit differs from its cash flow: a useful accounting measure does not answer every question about available money.

Definitions behind a growth headline

When you read a growth report, identify which question it answers: production or residents’ income; the total or an average per person; money at that year’s prices or a measure separating out price changes. A dollar conversion adds another change. Then read the period: the previous three months and the same three months a year ago are different comparisons. An early estimate can also be revised when more records become available. A real GDP growth rate and a nominal dollar GNI-per-person amount therefore answer different questions.

To understand household conditions, add evidence about wages, employment, consumer prices and income distribution. GDP and GNI provide a national picture; the household budget needs those additional details.

About the examples

All four tables use original, fictional scenarios, not current national statistics. The bread chain, cross-border income cases and one-good price model are separate annual models. Each table states its units; the cross-border income model assumes GDP equals GDI.

Each row of the per-person table compares a different scenario with the base case. Its hypothetical annual-average conversion rates are neither market observations nor forecasts. Calculations use unrounded values. Our editorial policy explains how we check the guides.