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The overall GDP growth rate can be analyzed by breaking it down into the contributions from each of its expenditure components. The significance of any single component's contribution to total GDP growth is determined by two factors: its growth rate during the period and its proportional share of the total GDP.

Calculating Component Contributions to GDP Growth

The growth of Gross Domestic Product (GDP) can be deconstructed by examining the contributions from each expenditure component. The contribution of any given component is calculated by multiplying its growth rate by its share of total GDP. This relationship is expressed by the following formula:

$ 
\text{percentage change in GDP =} 
\begin{split} 
& (\text{percentage change in consumption} \times \text{share of consumption in GDP)} \\ 
& \qquad + \\ 
& (\text{percentage change in investment} \times \text{share of investment in GDP)} \\ 
& \qquad + \\ 
& (\text{percentage change in government spending} \times \text{share of government spending in GDP)} \\ 
& \qquad + \\ 
& (\text{percentage change in net exports} \times \text{share of net exports in GDP)} 
\end{split} 
$ 

Formula for Decomposing GDP Growth by Expenditure Component

An application of GDP growth decomposition can be seen by analyzing the contributions of expenditure components to US GDP growth during the 2009 recession. This period, which occurred in the midst of the global financial crisis, provides a specific case study for understanding how consumption, investment, government spending, and net exports collectively influenced the overall change in economic output.

US GDP Growth Component Contributions During the 2009 Recession (Example)

An economic analyst observes two sectors in a country's economy. The technology sector, which constitutes 5% of the total economy, is growing at 10% per year. The manufacturing sector, which constitutes 40% of the total economy, is growing at 2% per year. Based on this information, which statement provides the most accurate analysis of each sector's contribution to the country's overall economic growth?

Analyze the following economic scenario and determine which sector is the primary driver of overall economic growth. Provide a brief justification for your conclusion.

Sectoral Contribution to Economic Growth

Imagine an economy where the services sector makes up 70% of the total economic output but is growing at only 1% per year. In the same economy, the technology sector makes up 5% of the total output but is growing at 12% per year. Explain which sector is likely contributing more to the overall economic growth and justify your reasoning.

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