Module 14 · How the economy works
The economy as a loop: money flows and GDP
How money moves between households, firms, government, banks and the rest of the world, how GDP adds it up, and what the number leaves out.
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In this lesson
- Describe the circular flow of money between households, firms, government, banks and other countries
- Calculate GDP from spending: C + I + G + (X − M)
- Tell nominal from real GDP, and total GDP from GDP per person
- Name four things that GDP leaves out
Tomaž owns a small bakery in Celje. This month he pays his two helpers, and they spend part of their wages in his bakery and in other shops. Where does that money go next, and how does a country add up all such flows into one number?
The economy is a loop
The is everything people and firms do to produce, sell and buy goods and services. A simple picture is the : money moves in a loop between households and firms.
- Households sell their work to firms.
- Firms pay wages.
- Households spend wages on goods and services.
- Firms use that income to pay wages again.
Three side doors change how much flows around:
- Government takes money out through taxes and puts it back through spending on schools, hospitals and roads. It also pays pensions and benefits.
- Banks collect savings and lend them to people and firms who want to borrow, for example for a home or a machine.
- The rest of the world buys what we export and sells us what we import.
Your pay, your pension and the bakery’s flour all travel through this same loop.
GDP counts what a country makes
(GDP) is the market value of all final goods and services produced inside a country in a period, usually a year or a quarter. “Final” means we count the bread, not the flour inside it. Otherwise the flour would be counted twice.
Statisticians can measure GDP by production, by income or by spending. The spending view is the easiest to remember:
GDP = C + I + G + (X − M)
- C: household spending (consumption)
- I: investment by firms, plus new housing
- G: government purchases of goods and services
- X − M: exports minus imports
Imports are subtracted because they are already inside C, I or G, and they were made abroad. Buying an imported phone does not make the economy smaller.
Pensions and benefits are not G. They are : money paid out without buying anything in return. They enter GDP later, when people spend them as C.
Real data have the same shape. Slovenia’s GDP in 2025 was about €71 billion (Eurostat, rounded). Households spent about €36 billion, firms and others invested about €15 billion, the government bought about €15 billion, and exports exceeded imports by about €4 billion. Changes in stocks of goods make up the small remainder.
Real, per person, and what is missing
GDP in the prices of the day is nominal. removes price rises, so it shows whether the country produced more. If nominal GDP grew 5% and prices rose 3%, real growth is about 5 − 3 = 2%. The exact figure is 1.05 ÷ 1.03 − 1 = 1.94%.
Total GDP mostly reflects the number of people. divides GDP by the population, which is a better rough guide to average living standards.
GDP also leaves things out:
- unpaid work, such as caring for children or parents, and volunteering;
- undeclared work in the shadow economy;
- damage to nature and the use of natural resources;
- how income is shared between richer and poorer people;
- leisure, health and wellbeing.
An oil-spill clean-up adds to GDP because someone is paid to do it, and the damage is never subtracted. GDP measures production, not happiness or wealth.
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