Which of the following allows increased government spending to be an effective tool in increasing demand? a. the laffer curve c. supply-side economics b. political pressures d. the multiplier effect

The multiplier effect allows increased government spending to be an effective tool in increasing demand, whereas the Laffer curve, supply-side economics, and political pressures do not.
The correct answer is D.

The third one is true. 0.3 > 0.20