multiplier accelerator effects
Overview
This lesson explores the multiplier and accelerator effects, two crucial concepts in macroeconomics that explain how changes in aggregate demand can lead to larger changes in national income and how changes in national income can in turn influence investment. Understanding these mechanisms is vital for analyzing economic fluctuations and the impact of government policies.
The Multiplier Effect: Concept and Mechanism
The **multiplier effect** describes how an initial injection into the circular flow of income, such as an increase in investment, government spending, or exports, leads to a larger final increase in national income. This occurs because the initial spending becomes income for others, who then spend a...
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Key Concepts
- Multiplier Effect: The process by which an initial change in aggregate demand (e.g., investment, government spending, exports) leads to a proportionately larger change in national income.
- Marginal Propensity to Consume (MPC): The proportion of an additional unit of income that is spent on consumption.
- Marginal Propensity to Save (MPS): The proportion of an additional unit of income that is saved.
- Marginal Propensity to Import (MPM): The proportion of an additional unit of income that is spent on imports.
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Exam Tips
- →Clearly distinguish between the multiplier and accelerator effects. The multiplier relates to changes in income from initial spending, while the accelerator relates to investment driven by changes in the *rate of growth* of income.
- →Practice calculating the multiplier using different formulas (1/(1-MPC) and 1/(MPS+MPT+MPM)) and be prepared to explain how changes in MPC, MPS, MPT, or MPM affect its size.
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