Good point, I didn't consider collusion. If A cuts a smaller slice on purpose, B can cut the remainder so that A and B still get the same amount, but C gets mor

Good point, I didn't consider collusion. If A cuts a smaller slice on purpose, B can cut the remainder so that A and B still get the same amount, but C gets more. But if A can trust C to give a part of his share later, then B can't do anything.