As in the case of the Hawks and Doves ...

Like the Hawks and Doves (the previous example, A.YA.), We arbitrarily set the price of the service in the glasses. Exact prices are not important, provided that the benefit of receiving the service exceeds the related zatraty.Esli frequency of attacks of the parasite is high, then each individual Cully in the population, consisting of the Innocents has a chance to use the services of his fellow about as often as he provides them with this service. Therefore, the average gain for simpletons who is among the Innocents, will be positive. All of them are in fact thrive, so that the name of the Innocents seems to them inappropriate. Now suppose that in a population appeared Dodger. Being the only Dodger, he can count on the fact that all the other members would pull for him pests, but he himself pay for it is not necessary. Its average yield is above average for simpletons. Therefore, the roguish genes will proliferate in the population, and ease of genes will be quickly eliminated. This is explained by the fact that, regardless of the ratio in the population of the Dodgers and the Innocents, the first will always be in a better position. For example, consider the case where the population consists of 50% of the Dodgers, and 50% of the Innocents. The average gain for those and for others will be lower than for each individual in a population consisting entirely of the Innocents. Yet the Dodgers are in a better position because they are getting all the benefits, whatever they were not paying for it is nothing. When the share of rogues to reach 90% average gain for all individuals will be very low: many individuals with one or another type will die from infections transmitted by ticks. But again, the Dodgers will be in a better position than the Innocents. Even if the population as a whole will reach full extinction, will never come a time when the gain exceeds the Innocents winning Dodgers. Therefore, until such time as we consider only these two strategies, nothing can stop the extinction of Innocents, and very likely, and the extinction of entire populations. Now suppose that there is a third strategy called Grudgebearer. Vindictive remove parasites from strangers and to those individuals who previously provided this service themselves. If, however, some individual will deceive them, they remember the incident and harbor malice against him, refusing to continue to pull out of his parasites. In a population consisting of Grudgebearer and the Innocents, it is impossible to distinguish one from another. Individuals of both types exhibit altruism to everyone else, and derive from it the same and with the highest average payoff. In a population consisting entirely of the Dodgers, one Grudgebearer not got like a big success. He'd spent a lot of energy, removing parasites from the majority of individuals found him, because he needs a certain time to develop rancor toward them all. In this case, no one will provide him with favors. If the share Grudgebearer small compared with the share of the Dodgers, then the gene will be eliminated rancor.