Politicians call for unity, to fight foreign enemies, for example. Some economists advocate grouping consumers (or producers) together to bargain for a lower (or a higher) price. Others want to use the same strategy to fight a monopolist or a monopsonist. Some even want to unite a demander and a supplier. Etc. This book proves that all these kinds of unity are deceptive or self-deceptive. This book then reveals a smart unity and shows that it means liberty.