The marginal propensity to consumer equals: Consumer spending as a proportion of disposable income
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MPC refers to the proportion of additional income that a consumer will spend on consumption rather than saving. Show more…
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21. Marginal Propensity to Consume is
Nick J.
Suppose that throughout the U.S. economy, individuals spend $$90 \%$$ of every additional dollar that they earn. Economists would say that an individual's marginal propensity to consume is 0.90 . For example, if Jane earns an additional dollar, she will spend $$0.9(1)=\$ 0.90$$ of it. The individual who earns $$\$ 0.90$$ (from Jane) will spend $$90 \%$$ of it, or $$\$ 0.81$$. This process of spending continues and results in an infinite geometric series as follows: $$1,0.90,0.90^{2}, 0.90^{3}, 0.90^{4}, \ldots$$
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Marginal Propensity to Consume The consumption function of the U.S. economy from 1929 to 1941 is $$C(x)=0.712 x+95.05$$ where $C(x)$ is the personal consumption expenditure and $x$ is the personal income, both measured in billions of dollars. Find the rate of change of consumption with respect to income, $d C / d x .$ This quantity is called the marginal propensity to consume.
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