That's ’just’ Keynesian economics: the government finding an excuse to boost aggregate demand by borrowing money to spend into the local economy. War has the re

That's ’just’ Keynesian economics: the government finding an excuse to boost aggregate demand by borrowing money to spend into the local economy. War has the relative advantage of constantly depleting the assets invested in and thus demanding re-investment, whilst the moral clime enhances the population's will to lend money to the state to fund such an endeavour (”Buy war bonds to fund our battleships! Help us defeat the Hun!”) Investment in infrastructure, on the other hand, generates return on investment for the local economy. War efforts often involve lots of infrastructure work too to support the industries that need to build the weapons (ports, railroads and highways to move goods, & cetera).