Altruism
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Last updated: 2026-07-18
What does “adaptive altruism” mean?
In biology, altruism is defined as a behavior that implies a cost for the individual who performs it (in terms of survival or reproduction) and a benefit for another individual. At first glance, this seems to go against Darwinian natural selection (“survival of the fittest”). However, modern evolutionary theory explains why such behaviors persist and spread:
1. Kin Selection – W.D. Hamilton (1964)
Organisms tend to help their genetic relatives more because they share genes.
Hamilton’s rule summarizes this: rB > C (where r = degree of relatedness, B = benefit to the recipient, C = cost to the donor).
Classic example: worker bees that sacrifice themselves for the queen (sister) and the hive. In humans, intense parental care and help to siblings/cousins is the most obvious case.
Reciprocal altruism – Robert Trivers (1971)
Helping others with the expectation (not necessarily conscious) that the help will be returned in the future. It requires:
- Repeated interactions.
- Ability to recognize individuals.
- Memory of past interactions.
- Mechanisms to punish “cheaters.”
This explains cooperation among non-relatives.
Other mechanisms:
- Group/multilevel selection (though more controversial).
- Reputation and costly signaling: helping visibly generates status and better opportunities for mating or alliances.
- Emotions such as empathy, guilt, gratitude, and shame as evolved “psychological mechanisms” that facilitate altruism.
Studies in primates, vampire bats (Desmodus rotundus), which regurgitate blood to companions who did not feed, human hunter-gatherers, and experimental economics experiments (such as the ultimatum game or the repeated prisoner’s dilemma) confirm that these mechanisms are deeply wired.
Connection with Austrian economics and philosophy
From the Austrian perspective (Mises, Hayek, Rothbard), this is coherent: the human being is an acting being with his own ends, but cultural and biological evolution has selected institutions and norms (private property, reciprocity, spontaneous morality) that allow voluntary cooperation to generate spontaneous order. Genuine altruism exists, but it is more sustainable when aligned with individual incentives (well-understood self-interest, as Tocqueville said, or even Mises when speaking of the “harmony of interests”).
Forced altruism (via the State) is usually counterproductive because it destroys the information and incentives that arise from voluntary action. Biology does not say that we are “pure altruists” nor “pure egoists”: it shows that we have an adaptive mix, where cooperation emerges from the bottom up.
Biology does not refute methodological individualism; it enriches it. It shows that the capacity to act disinterestedly in certain contexts (family, tribe, trust relationships) was selected because it increased long-term survival and reproduction.
Categories: Home -> Dictionary
Last updated: 2026-07-18
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