How do you try to ensure it works out fair for all of you if you have limited resources? For example, if you have a big bag of sweets and one person wants to eat lots of them right away, but others want to save them for later in the week. Do you divide them up so each person has their share of the sweets to eat when they want? How do you balance the need to eat perishables before they go off with letting everyone eat what they want? At the moment my kids want to know how many each other have had to decide how many to have themselves, which I think is fair to make sure someone doesn't leave one of the others without, but it also seems to work the other way - that if M has had 3, K will think she has to have 3, even if she would have been happy with 2 if she hadn't know what M had.
I can see how the principle would work if there's a plentiful supply of food, but I'm trying now to understand how it translates to our circumstances. I hope my rambling has made sense!