Answer:
No change
Step-by-step explanation:
The complete question is "The fictional country of Alpetra increases the income tax rate so that tax revenues increase by $50 million. If GDP, consumption, and Government spending remains the same and Alpetra is a closed economy, what is the change in investment?"
The closed economy equilibrium is at: Y = C + I + G. Where Y = Real GDP, C = Consumption, I = Investment and G = Government spending.
The Y, C, G are constant so the investment is not changed. I = Y - C - G. So, this is the same before-tax and after-tax change.