Answer:
Keynesian theory
Step-by-step explanation:
Keynesian theory was used by both the President of United States. President George W. Bush and as well as President Barack Obama used this theory during the crisis.
Keynesian is also known as Keynesianism, the word came from the name of economist known as John Maynard Keynes.
Keynesian theory is the theory that talks about the economics field, that for boosting the growth, the government should increase the demand.