Because they conserved limited resources for the war effort. It also motivated the masses by making them feel like they contributed.
You don’t understand psychological warfare well at all, do you?
Once again, you are not rich. Nor do you understand economics well. Tell me, who subsidizes the Walton family when they pay their employees low wages to the point their employees qualify for food stamps? Who pays for that and who profits? Then, who gets a tax cut?
Indeed, are food stamps good or bad for the economy? How about higher wages?