Injection
Definition. An injection is an addition of spending into the circular flow of income that does not originate from the spending of domestic households on domestic output. The three injections are investment, government spending, and exports, all of which raise the level of national income.
National income is in equilibrium when total injections equal total withdrawals, and an increase in injections raises income by a multiplied amount through the multiplier process.
This term belongs to The Circular Flow of Income in A Level Economics. Read the full chapter for the diagrams, worked examples and exam technique.
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