What are the components of GDP under the expenditure approach and how do net exports work?

Question

AcadiFi · Accepted Answer

The expenditure approach is the most commonly tested GDP calculation method on the CFA Level I exam. Let me clarify each component so there's no confusion.

**The Formula:**

**GDP = C + I + G + (X - M)**

Where:
- **C** = Personal consumption expenditure
- **I** = Gross private domestic investment
- **G** = Government spending on goods and services
- **X - M** = Net exports (exports minus imports)

**Breaking Down Each Component:**

**C (Consumption) — typically 65-70% of GDP:**
- Durable goods (cars, appliances)
- Nondurable goods (food, clothing)
- Services (healthcare, education, haircuts)
- This is the largest GDP component in most developed economies

**I (Investment) — NOT financial investment:**
This is the biggest source of confusion. "I" means:
- Business spending on equipment and structures (Thornfield Manufacturing buys a $2.5M assembly robot)
- Residential construction (new homes being built)
- Changes in business inventories
- It does **NOT** include buying stocks or bonds — that's financial investment, which is not part of GDP

**G (Government Spending):**
- Government purchases of goods and services (military equipment, teacher salaries, road construction)
- It does **NOT** include transfer payments (Social Security, unemployment benefits, welfare). Transfer payments are just redistribution — the government isn't purchasing a good or service.

**X - M (Net Exports):**
- X = value of goods and services sold to foreigners
- M = value of goods and services purchased from foreigners
- If M > X, net exports are **negative**, which **reduces** GDP

**Worked Example:**

Consider the fictional country of Verdania in 2025 (all figures in billions):

| Component | Amount |
|-----------|--------|
| Consumption (C) | $850 |
| Investment (I) | $230 |
| Government spending (G) | $280 |
| Exports (X) | $175 |
| Imports (M) | $210 |
| Transfer payments | $95 |

**GDP = $850 + $230 + $280 + ($175 - $210)**
**GDP = $850 + $230 + $280 + (-$35)**
**GDP = $1,325 billion**

Notice: the $95B in transfer payments is **not included** in the calculation.

**Common Exam Traps:**
1. Including transfer payments in G (wrong!)
2. Treating stock purchases as investment I (wrong!)
3. Forgetting that imports are subtracted
4. Confusing nominal GDP with real GDP — the expenditure approach gives nominal GDP unless prices are adjusted

For more macroeconomics practice problems with worked solutions, check out the CFA Level I economics section in our question bank.

What are the components of GDP under the expenditure approach and how do net exports work?

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