AS & A-Level Economics — The Multiplier, Economic Cycles and Sustainability

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Original Deckloop economics study material on the multiplier, economic cycles and sustainability, with 120 practice cards and 24 concept explainers. Includes worked applications and analytical reasoning.

Economics EN A-Level

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Autonomous and Induced Consumption

Consumption expenditure can be categorised into two main types: autonomous and induced. Autonomous consumption refers to the level of spending that occurs regardless of the current level of disposable income. This spending is typically financed through past savings, borrowing, or wealth. In contrast, induced consumption is the portion of consumption that directly varies with changes in current disposable income. As disposable income rises, induced consumption tends to increase, and vice versa. The relationship between total consumption (C) and disposable income (Yd) is often represented by a linear consumption function: C = a + bYd, where 'a' is the autonomous consumption (the intercept) and 'b' is the marginal propensity to consume (MPC), which determines the induced consumption (bYd). Understanding these components is crucial for analysing aggregate demand.

Key points

Autonomous consumption is spending independent of current disposable income.
Induced consumption changes directly with current disposable income.
The consumption function C = a + bYd models total consumption.
'a' represents autonomous consumption, and 'bYd' represents induced consumption, where 'b' is the MPC.

Worked example

Question

A household has an autonomous consumption of 400 monetary units per month. For every 100 monetary units increase in their monthly disposable income, their consumption rises by 80 monetary units. If the household's monthly disposable income is 2,500 monetary units, calculate their total consumption and identify the autonomous and induced components.

Solution

1. First, identify the autonomous consumption (a), which is given as 400 monetary units.
2. Next, determine the marginal propensity to consume (b). Since consumption rises by 80 monetary units for every 100 monetary units increase in disposable income, b = 80/100 = 0.8.
3. Now, calculate the induced consumption (bYd) using the given disposable income (Yd = 2,500 monetary units): Induced consumption = 0.8 * 2,500 = 2,000 monetary units.
4. Finally, calculate total consumption (C) by summing autonomous and induced consumption: C = a + bYd = 400 + 2,000 = 2,400 monetary units.

The household's total consumption is 2,400 monetary units. The autonomous component is 400 monetary units, and the induced component is 2,000 monetary units.

Common pitfalls

Confusing autonomous consumption with total consumption. Autonomous consumption is the baseline spending when disposable income is zero, whereas total consumption includes both autonomous and induced components.
Assuming autonomous consumption is always fixed over time. While independent of current income, autonomous consumption can shift due to factors like changes in wealth, interest rates, or consumer expectations about the future.

Prerequisites

Deck 05 — Households and Firms in the Circular Flow: To understand the concept of household income, from which disposable income is derived and which is central to consumption analysis.
Deck 05 — Components of Aggregate Demand: To understand consumption as a major component of aggregate demand in a macroeconomic context, which this concept then dissects into autonomous and induced parts.
Ratios and simple equations: To understand the linear consumption function C = a + bYd and perform basic calculations involving it.