Pearson Edexcel · A-Level · Economics B
Course version: 9EB0 · Version from Sept 2015
B) The impact of injections into and withdrawals from the circular flow of…
Full specification wording
Circular flow of income, expenditure and output: b) The impact of injections into and withdrawals from the circular flow of income
Injections and withdrawals (leakages) modify the basic circular flow of income by adding or removing money.
Checked against the Pearson Edexcel 9EB0 specification (opens in a new tab) on .
- Point 2 of 4
- 3 key terms
Study notes
From the checked teaching notes for this specification point.
The idea
Injections and withdrawals (leakages) modify the basic circular flow of income by adding or removing money. Injections are additions to the circular flow that do not originate from domestic households: investment by firms, government spending, and export revenue. Withdrawals are leakages of income that are not spent on domestic goods and services: savings by households, taxation by the government, and spending on imports. The impact of these variables determines macroeconomic equilibrium. If injections exceed withdrawals, national income rises, leading to economic growth. Conversely, if withdrawals exceed injections, national income falls, potentially causing a recession.
What earns the marks
- Identification of investment, government spending, and exports as injections into the circular flow.
- Identification of savings, taxation, and imports as withdrawals or leakages from the circular flow.
- Understanding that macroeconomic equilibrium occurs when total injections equal total withdrawals.
- Recognition that an excess of injections over withdrawals leads to an expansion of national income.
- Recognition that an excess of withdrawals over injections leads to a contraction of national income.
Common mistakes and how to put them right
Classifying imports as an injection because goods enter the country.
Put it right: Imports are a withdrawal because money leaves the domestic circular flow.
Confusing investment with saving.
Put it right: Saving is a withdrawal by households, whereas investment is an injection by firms.
Assuming that an increase in taxation will increase national income.
Put it right: Taxation is a withdrawal, so an increase reduces the circular flow of income.
Exam tips
- Memorise the components of injections (investment, government spending, exports) and withdrawals (savings, taxation, imports) to quickly evaluate their impact on national income.
- When evaluating economic policies, trace their effects through the circular flow by identifying whether they primarily alter injections or withdrawals.
- Use the concept of injections and withdrawals to explain the multiplier effect, where an initial injection leads to a greater final increase in national income.
Try the lesson
The start of the Circular flow of income, expenditure and output: b) The impact of injections into and withdrawals from the circular flow of income lesson, made from checked teaching notes for this specification point.
Have a go first
Which of the following is classified as an injection into the circular flow of income?
Listen
Injections and withdrawals (leakages) modify the basic circular flow of income by adding or removing money. Injections are additions to the circular flow that do not originate from domestic households: investment by firms, government spending, and export revenue. Withdrawals are leakages of income that are not spent on domestic goods and services: savings by households, taxation by the government, and spending on imports. The impact of these variables determines macroeconomic equilibrium. If injections exceed withdrawals, national income rises, leading to economic growth. Conversely, if withdrawals exceed injections, national income falls, potentially causing a recession. A strong answer earns marks for these points. Identification of investment, government spending, and exports as injections into the circular flow. Identification of savings, taxation, and imports as withdrawals or leakages from the circular flow. Understanding that macroeconomic equilibrium occurs when total injections equal total withdrawals. Recognition that an excess of injections over withdrawals leads to an expansion of national income. Exam tip: Memorise the components of injections (investment, government spending, exports) and withdrawals (savings, taxation, imports) to quickly evaluate their impact on national income.
See it
Key words
Say what each word means before you turn the card.
Macroeconomic equilibrium
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Injections
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Withdrawals
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See every definition
- Macroeconomic equilibrium
- The state that occurs when total injections into the circular flow equal total withdrawals from it.
- Injections
- Additions to the circular flow that do not originate from domestic households: investment by firms, government spending, and export revenue.
- Withdrawals
- Leakages of income not spent on domestic goods and services: savings by households, taxation by the government, and spending on imports.
Label the diagram
Some boxes have lost their names. Pick the right name for each number.
1Box 1
2Box 2
3Box 3
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