Suppose autonomous investment increases by 100 billion and...

Suppose autonomous investment increases by $$\$ 100$$ billion and the MPC is 0.75 .
a. Use the following table to compute four rounds of the spending multiplier effect:
b. Use the spending multiplier formula to compute the final cumulative impact on aggregate spending.

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Key Concepts

Spending Multiplier Formula

The spending multiplier is calculated using the formula 1/(1 - MPC), which quantifies the total cumulative increase in aggregate spending resulting from an initial change. It encapsulates the idea that each dollar spent will repeatedly generate further spending in the economy, ultimately leading to a magnified impact.

Multiplier Effect

The multiplier effect describes how an initial increase in spending leads to a series of additional spending rounds, with each round being smaller than the previous one. This chain reaction results in a cumulative impact on aggregate spending that is larger than the initial change.

Autonomous Investment

This refers to investment spending that is independent of current income levels and is determined by factors outside of the current economic cycle. It is the initial injection into the economy that can trigger further spending through the multiplier process.

Marginal Propensity to Consume (MPC)

The MPC measures the fraction of an additional dollar of income that is spent on consumption. A higher MPC indicates that consumers are likely to spend more of their extra income, thereby amplifying the effect of any initial spending injection on aggregate demand.

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