In the simple multiplier model, assume that investment is...

Name: Problem 4, Chapter 22: Economics
Uploaded: 2020-05-18T00:20:09-08:00
Duration: 2 min 17 s
Channel: Colynn Vacko
Description: In the simple multiplier model, assume that investment is always zero. Show that equilibrium output in this special case would come at the break-even point of the consumption function. Why would equilibrium output come above the break-even point when investment is positive?

In the simple multiplier model, assume that investment is always zero. Show that equilibrium output in this special case would come at the break-even point of the consumption function. Why would equilibrium output come above the break-even point when investment is positive?

Key Concepts

Consumption Function

The consumption function is a fundamental concept in macroeconomics that shows the relationship between disposable income and consumer spending. It indicates how much households are likely to consume at various levels of income, and it plays a critical role in determining overall aggregate demand in the economy.

Equilibrium Output

Equilibrium output is the level of total production or income where aggregate demand equals total output. In simple macroeconomic models, this is the point at which all goods produced are purchased, meaning that intended spending matches actual output, ensuring that there are no unintended inventories.

Simple Multiplier Model

The simple multiplier model explains how an initial change in autonomous spending (such as consumption or investment) leads to a larger change in equilibrium output. This model highlights the process by which income cycles through the economy, with each round of spending generating additional income and further spending.

Break-even Point

The break-even point in the context of the consumption function refers to the level of output at which total consumption exactly equals income, leaving no room for either saving or unplanned inventory accumulation. When investment is zero, equilibrium output must occur at this point as there are no additional expenditures to boost demand.

Role of Investment

Investment represents autonomous spending that is independent of current income levels, and it contributes directly to aggregate demand. When investment is positive, it adds to the consumption-led demand, thereby shifting the required level of equilibrium output above the break-even point. This extra demand propels output to a higher level than would be determined by consumption alone.

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