Some very interesting ideas about reason and communication in human society. However, it missed that a key social function of reason and communication is for j

Some very interesting ideas about reason and communication in human society. However, it missed that a key social function of reason and communication is for joint decision making. So one person throws out a suggestion with some reasons for it, a second presents reasons to point out what is right and wrong about it and persuades the first person, and throws out a new suggestion, the first person critiques it, and so on back-and-forth until a course of action is arrived at that both people agree is best. You can see this process even in fairly young children. It is odd Sperber misses this since he seems to have just this sort of relationship with his collegues and co-workers, and enjoys it very much.