The expenditure approach for calculating GDP is represented by the formula:

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

Where:

• $C$: Consumption
• $I$: Investment
• $G$: Government Purchases
• $X$: Exports
• $M$: Imports
• $X - M$: Net Exports of Goods and Services

Step 1: Calculate Net Exports of Goods and Services ($X - M$)

$X - M = 2,123.4 - 2,774.6 = -651.2 \, \text{billion dollars}$

Step 2: Calculate GDP

$GDP = 14,047.6 + 3,637.8 + 3,859.5 + (-651.2)$ $GDP = 20,893.7 \, \text{billion dollars}$

Completed Table:

Category	Value (Billions of Dollars)
Consumption (C)	14,047.6
Investment (I)	3,637.8
Exports (X)	2,123.4
Imports (M)	2,774.6
Net Exports of Goods and Services ($X-M$)	-651.2
Government Purchases (G)	3,859.5
Gross Domestic Product (GDP)	20,893.7

Let me know if you'd like further clarification or have related questions. Here are some that could expand your understanding:

1. How is the expenditure approach different from the income approach to calculating GDP?
2. Why are imports subtracted in the GDP calculation?
3. What role does government spending play in economic growth?
4. How does negative net export affect a country’s GDP?
5. How are these figures adjusted for inflation over time?

Tip: Always distinguish between nominal GDP and real GDP when analyzing economic data to account for inflation.