What is GDP Calculation?
GDP (Gross Domestic Product) is the total market value of all finished goods and services produced within a country in a given period. It's the main measure of an economy's size and growth.
GDP = C + I + G + (X – M), where C is consumer spending, I is investment, G is government spending, X is exports, and M is imports. Three methods calculate it: expenditure, income, and production.
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Step-by-step worked examples
A country has: consumer spending $1,500B, investment $600B, government spending $800B, exports $400B, imports $350B. Calculate GDP.
GDP = C + I + G + (X – M) GDP = 1500 + 600 + 800 + (400 – 350) GDP = 1500 + 600 + 800 + 50 = $2,950 billion
If exports rise from $400B to $500B while imports fall to $300B, how much does GDP change?
Old (X – M) = 400 – 350 = 50 New (X – M) = 500 – 300 = 200 Change = 200 – 50 = +150B GDP increases by $150 billion
In a recession, government increases spending from $800B to $1,000B. If C, I, X, M stay constant, new GDP?
G change = 1000 – 800 = 200 Old GDP = 2,950 New GDP = 2,950 + 200 = $3,150 billion
Flashcards
Quick quiz
Q1.If C = 1500, I = 500, G = 700, X = 300, M = 200, what is GDP?
Q2.What does X − M represent in GDP?
Q3.If imports rise and nothing else changes, GDP…
Q4.Which is NOT a component of GDP?
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Common mistakes
GDP includes used goods. — Correct: GDP counts only NEW goods and services — used goods were counted when first made.
Imports increase GDP. — Correct: Imports subtract from GDP (M is subtracted in the formula).
GDP measures income distribution. — Correct: GDP measures total production value, not how income is shared.
Only the production method calculates GDP. — Correct: Three methods exist: expenditure, income, and production — all give the same result.
FAQ
What is GDP calculation?
GDP is calculated using the expenditure method: GDP = C + I + G + (X – M), where C is consumer spending, I is investment, G is government spending, and (X – M) is net exports.
Why do imports subtract from GDP?
Imports are goods produced abroad, not domestically. They are subtracted because GDP only counts domestic production.
What's the difference between GDP and GNP?
GDP measures production within a country's borders; GNP measures production by a country's citizens, wherever they are.
Does GDP include services?
Yes — GDP includes all final goods AND services (healthcare, education, entertainment, etc.) produced domestically.