Question

disposable income (billions of dollars per year) total consumption (billions of dollars per year) $ 0 $ 50 200 210(table 9.1) which of the following represents the consumption function consistent with this data?

Answer 1

C = 50 + 0.8Y is the consumption function that is consistent with the provided data. The MPC is determined by subtracting the change in consumption from the change in disposable income, which equals 160/200, or 0.8.

Marginal propensity calculation.

$200 billion less $0 billion equals $200 billion in changes to disposable income.

Consumption change equals $210 minus $50, or $160 billion.

MPC = Change in Consumption/Change in Disposable Income, which equals $160 billion/$200 billion and is equal to 0.8.

There is a 0.8 marginal tendency to consume.

Step 2

This is how consumption function is defined.

C = a + bY

Where,

a = Consumption at zero income level

b = MPC

In given case,

$50 billion would be consumed at a level of income zero.

MPC is 0.8

So,

C = 50 + 0.8Y is the consumption function that matches the provided data.

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