Back when I was in school days I worked at Taco Bell. Every night the store manager weighed the ingredients in the hot line and the cold line in the kitchen. If us the staff were using too much ingredients to add to the tacos and burritos on certain shifts and not following corporate policy in the amount of stuff that goes into each food item, then we were told to skimp on future orders so the food costs that the manager would be held accountable for at the end of the week would satisfy his bosses.