Explain in words and using the notion of expenditure rounds...

Key Concepts

Expenditure Multiplier

The expenditure multiplier captures how an initial change in government spending or another component of aggregate demand leads to a larger overall change in national income. This happens because the initial spending creates income for someone who then, in turn, spends a portion of it, leading to additional rounds of expenditure. Each round is proportionally smaller due to leakages such as savings, taxes, and imports, but together they build up to a sum greater than the initial injection.

Tax Multiplier

The tax multiplier reflects the change in national income resulting from a change in taxation, which affects household disposable income. Since taxes influence spending indirectly by altering the net income of consumers, the impact on aggregate demand occurs only through the change in consumption. Because individuals only spend a fraction of the extra disposable income determined by their marginal propensity to consume, the tax multiplier ends up being smaller than the expenditure multiplier.

Marginal Propensity to Consume (MPC)

The marginal propensity to consume indicates the proportion of additional income that households spend on consumption. It is a critical factor in both multipliers because it determines the size of each subsequent round of spending. A lower MPC means that a smaller portion of additional income is spent, which dampens the multiplier effect, especially in the case of tax changes where only disposable income changes.

Expenditure Rounds

Expenditure rounds describe the iterative process by which an initial injection of spending circulates through the economy. Each round represents a stage where recipients of income spend a fraction of it, leading to further rounds of spending. The concept helps illustrate why the impact of fiscal measures, such as government spending and tax changes, is distributed over multiple rounds of expenditure, with the intensity of each round diminishing due to leakages like savings or taxes.

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