Eduqas A-Level Economics A520QS
Scarcity, Choice and the Economic Problem
Demand, Supply and Market Equilibrium
Elasticities of Demand and Supply
The Labour Market
Costs, Revenues, Profits and the Growth of Firms
Market Structures
Competition Policy and Privatisation
Market Failure and Government Intervention
The Circular Flow and Aggregate Demand
Aggregate Supply and the Phillips Curve
Economic Growth
Unemployment
Inflation and Deflation
The Balance of Payments
Control of the National Debt
Fiscal Policy
Monetary Policy and Financial Stability
Exchange Rates and Supply Side Policies
International Trade and Protectionism
Globalisation and the UK in the World Economy
Economic Development
The Circular Flow and Aggregate Demand
Injections, withdrawals and equilibrium national income
- 3 things to know
- All three components
Overview
Withdrawal from the circular flow, three withdrawals from the circular flow and injection into the circular flow.
What you need to know
Answer each one before you reveal it.
Name the three injections into the circular flow.
Define a withdrawal from the circular flow.
Questions from this subtopic
Each one with the model answer underneath.
- 1
Define a withdrawal from the circular flow.
Model answer
A withdrawal is income that is not passed on as spending on domestic output. Withdrawals reduce the size of the flow.
- 2
Name the three withdrawals from the circular flow.
Model answer
Saving is income households choose not to spend. Taxation is income taken by the government. Money spent on imports leaves the domestic flow.
- 3
Define an injection into the circular flow.
Model answer
An injection is spending on domestic output that does not come from household income. Injections increase the size of the flow.
- 4
Name the three injections into the circular flow.
Model answer
Investment is spending by firms on capital goods. Government spending is state expenditure on goods and services. Exports are purchases of domestic output by foreign buyers.
- 5
State the condition for equilibrium national income.
Model answer
National income is in equilibrium when total injections equal total withdrawals. The flow then has no tendency to expand or contract.
- 6
Write the equilibrium condition using the usual symbols.
Model answer
Equilibrium requires I + G + X to equal S + T + M. Injections on the left balance withdrawals on the right.
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