Building things (roads, spaceships, bridges, etc), funding things (medical research, education, etc) and other obvious things. Low interest rates make longer term projects much more viable.
https://en.wikipedia.org/wiki/Financial_cost_of_the_Iraq_War
This is really the broken window fallacy.
Building things (roads, spaceships, bridges, etc), funding things (medical research, education, etc) and other obvious things. Low interest rates make longer term projects much more viable.