Competitive Altruism - The Handicap Principle

The Handicap Principle

The theory of competitive altruism also helps one connect such behavior to the handicap principle. With competitive altruism, cooperation is considered a trait that provides a signaling benefit, and thus is subject to sexual selection. Like a peacock's tail, cooperation persists and is magnified, even though it carries a cost to the individual. Cooperation must be significantly costly to the individual, such that only a limited proportion of the population is fit enough to partake.

Roberts builds on the idea of altruism as a signaling benefit with his "free gift theory". Because the recipient gains some benefit from the interaction with the donor, there is an incentive to pay attention to the signal. For example, some male birds will offer food to a potential mate. Such behavior, called courtship feeding, not only benefits the female, who receives a meal without expending any energy, but also conveys the ability of the male to forage. Consequently, the signal is kept true (i.e. it remains a correct reflection on the fitness of the mate).

However, the connection between competitive altruism and signaling is not without criticism. Wright raises the point that an altruistic signaling behavior like gift giving would cause a "flow of fitness from the higher quality individual to the lower quality one" and reduce the veracity of the signal. To account for this likely trend, Wright stipulates that the altruistic behavior must be directed at a mate or ally. In order for the theory to hold true, the signaling benefit would have to be shown to improve the individual's fitness beyond the benefit gained from the "investment" in the partner.