during a major war like WWII, government not only conscripts workers into the military, but it also redirects resources to production for the war effort. Without rationing and wage and price controls, this can lead to a general price and wage inflation. Note that it does not take a major war for this to happen. If government spending pushes the economy to, and beyond, full employment it is likely that inflation will result even without a major war.
War time wage and price
