What is group cohesiveness? What influence does group size have on group cohesiveness?

The degree to which members of a group are attracted to each other and value their group membership is called cohesiveness. As the value of the group to the individual increases, so too does the likelihood that the group will guide consumption decisions. Smaller groups tend to be more cohesive, because it is more difficult to relate to larger groups of people. By the same token, groups often try to restrict membership to a select few, which increases the value of membership to those who are admitted. Exclusivity of membership is a benefit often touted by credit-card companies, book clubs, and so on, even though the actual membership base might be fairly large.