According to Keynesian economists, which of the following is true in this case?
1. The increase in deficit-financed govt spending causes real GDP to increase to natural real GDP.
2. The increase in deficit-financed govt spending causes real GDP to increase, but not to natural real GDP.
3. The increase in deficit-financed govt spending has no impact on real GDP or the price level.
4. Real GDP does not increase, only the price level increases.
This is an example of what?