What does a major World War do to your economy?

There's a line in a song that goes, "And a war is a costly thing to wage." There's link to the song below. Starting a war is a great way to mess with your economy.
#war #warfare #economy #economics #ww2 #ww2history #money

https://youtu.be/S3LV3-hb4vI?si=4SbzuWOVzmktrOba