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Multiplier effect definition
The multiplier effect is the process by which an initial change in spending or investment produces a larger total change in economic output. It works because one party's spending becomes another party's income.
The effect runs through repeated rounds of spending. Money that a government, business, or consumer spends becomes income for someone else, who spends part of it again, and each round adds further income and demand to the economy. The share that is saved, taxed, or spent abroad leaks out of the cycle, so the final total depends on how much of each round is re-spent.
The spending multiplier is distinct from the money multiplier. The spending multiplier tracks how an injection of demand ripples through income and output, while the money multiplier describes how bank lending expands the money supply from a given base of reserves. A larger multiplier amplifies a policy change; a smaller one limits its reach.
Multiplier effect Example
A government spends USD 1 billion on infrastructure. Construction firms receive the money, pay workers, and buy materials.
Those workers and suppliers then spend part of their income elsewhere. If each round re-spends about half of what it receives, the total builds up:
USD 1 billion + USD 500 million + USD 250 million + ... = USD 2 billion
The original USD 1 billion supports roughly USD 2 billion of total economic activity once the rounds are added together.
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