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This is an agent-based model to analyze the impact of altruistic acts as costly practices on group stability according to costly signaling theory, while respecting the requirements of Darwinian evolution. It focuses on the comparison between one altruistic and one non-altruistic group and includes external living conditions that influence the fitness of the populations. The results of the simulation of the model show that altruistic groups survive under more severe and extensive external conditions than non-altruistic groups only if the benefit of an altruistic act far exceeds its cost. In milder circumstances, altruistic groups can have disadvantages regarding group stability compared to non-altruistic groups.