Comment by alphazard

> It's possible that the kid uses a different rule to evaluate it. Like "a small person needs small portions" or some variation.

Fair enough. It's definitely missing the opposing case where 1 graham cracker each is split on only one side and therefore the situation goes from fair to unfair, even though it's the same amount of graham cracker.

> I'd be convinced that the kid doesn't get it if they swapped crackers and then it stopped being fair.

I wouldn't count on that. I think the kid (and most adults) would claim it's fair if they thought they could get away with it. The deep intuition for "fair" that I expect from children would be derived from past experience negotiating with peers, not from any kind of moral theory.