Under these assumptions, the budget-neutral tax cut policy would result in a decrease in real GDP of $4 billion (rounded to the nearest billion).
How did we get the value?
To analyze the impact of the budget-neutral tax cut policy, we can use the concept of the fiscal multiplier. The fiscal multiplier represents the overall change in real GDP resulting from a change in government spending or taxes.
The formula for the fiscal multiplier is given by:
![\[ \text{Fiscal Multiplier} = \frac{1}{1 - \text{MPC}} \]](https://img.qammunity.org/2024/formulas/business/high-school/2m16w78ti7o79dzn9hoip5jyfs8r362be9.png)
Given that the MPC (Marginal Propensity to Consume) is 0.75, we can substitute this value into the formula:
![\[ \text{Fiscal Multiplier} = (1)/(1 - 0.75) \]](https://img.qammunity.org/2024/formulas/business/high-school/9n8ao6cz4tohs8smck59kvmvses89gnol0.png)
![\[ \text{Fiscal Multiplier} = 0.25 \]](https://img.qammunity.org/2024/formulas/business/high-school/46v1nj5pf8s98adumfdzryv5zrotm46txa.png)
This means that for every dollar cut in taxes, the overall impact on real GDP will be four times that amount.
Now, since taxes are cut by $15 billion, and the fiscal multiplier is 4, we can calculate the overall impact on real GDP:
![\[ \text{Impact on GDP} = \text{Fiscal Multiplier} * \text{Change in Taxes} \]](https://img.qammunity.org/2024/formulas/business/high-school/e37fzi3kgyxvu82n9fyi8dj5bvzharinng.png)
![\[ \text{Impact on GDP} = 0.25 * (-$15 \, \text{billion}) \]](https://img.qammunity.org/2024/formulas/business/high-school/wjf2anmj0gt8ngasld6vcoey3nhb7v2p63.png)
![\[ \text{Impact on GDP} = -$3.75 \, \text{billion} \]](https://img.qammunity.org/2024/formulas/business/high-school/wepol682m7d1k6clpjbvoh4abdt4qxejit.png)
Therefore, under these assumptions, the budget-neutral tax cut policy would result in a decrease in real GDP of $4 billion (rounded to the nearest billion).