Formula for Decomposing GDP Growth by Expenditure Component
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}
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Formula for Decomposing GDP Growth by Expenditure Component
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?
Sectoral Contribution to Economic Growth
A sector of the economy that is growing at 10% will always contribute more to overall economic growth than a sector growing at 3%.
Analyzing Economic Growth Components
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Consider an economy where total economic output grew by 2.0% in a given year. The table below shows the growth rate for three major components of spending and their respective shares of the total economy.
Spending Component Share of Total Economy Annual Growth Rate Consumption 70% 2.0% Investment 15% 5.0% Government Spending 20% 1.0% Based on this data, which statement accurately analyzes the sources of the economic growth?
Calculating a Missing Component's Contribution to GDP Growth
Analyzing an Economic Slowdown
True or False: In an economy, if the investment component experiences a 5% growth rate while the consumption component only grows by 2%, it is certain that investment contributed more to the overall economic growth than consumption did.
Evaluating Economic Growth Strategies
An economy's spending components and their performance over one year are detailed in the table below. Match each spending component to its calculated contribution to the total economic growth for that year.
Component Share of Economy Annual Growth Rate Consumption 60% 3.0% Investment 25% -2.0% Government Spending 15% 4.0% Net Exports 0% 10.0% An economy's total output is composed of four spending components. In a specific year, consumption, which makes up 60% of the economy, grew by 2%. Investment, which is 20% of the economy, grew by 5%. Government spending, at 15% of the economy, grew by 1%. Finally, net exports, which constitute the remaining 5% of the economy, decreased by 10%. Based on these figures, the total percentage change in the economy's output for the year was ____%. (Please provide the answer to two decimal places.)
An economic analyst wants to determine the primary drivers of a country's economic growth in the past year. Arrange the following tasks in the logical order required to decompose the total growth into the contributions from its main spending components.
Calculating a Missing Growth Rate for Policy Analysis
An economic advisor observes that a country's total economic output grew by 3.0% in a particular year. They also note that government spending, which constitutes 20% of the economy, grew by 5.0%. Based on this, the advisor concludes, "The strong 5.0% growth in government spending was the primary driver of the overall 3.0% economic growth."
Which of the following statements provides the most accurate critique of the advisor's conclusion?