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The theory views ethnocentrism and racism as nepotism toward extended kin and an extension of kin selection. In other words, ethnic nepotism points toward a biological basis for the phenomenon of people preferring others of the same ethnicity or race; it explains the tendency of humans to favor members of their own racial group by postulating that all animals evolve toward being more altruistic toward kin in order to propagate more copies of their common genes.
"The myth of common descent", proposed by many social scientists as a prominent ethnic marker, is in his view often not a myth at all.[clarification needed] "Ethnicity is defined by common descent and maintained by endogamy".
To guard one's genetic interests, Frank Salter notes altruism toward one's co-ethnics:
Hamilton's 1975 model of a genetic basis for tribal altruism shows that it is theoretically possible to defend ethnic genetic interests in an adaptive manner, even when the altruism entails self sacrifice. He argued mathematically that an act of altruism directed towards the tribe was adaptive if it protected the aggregate of distant relatives in the tribe. In sexually-reproducing species a population's genetic isolation leads to rising levels of interrelatedness of its members and thus makes greater altruism adaptive. Low levels of immigration between tribes allow growing relatedness of tribal members, which in turn permits selection of altruistic acts directed at tribal members, but only if these acts "actually aid in group fitness in some way…" Closely related individuals are less likely to free ride and more likely to invest in and thus strengthen the group as a whole, improving the fitness of its members.
Regarding how this translates into politics and why homogeneous societies are more altruistic, Frank Salter writes:
Relatively homogeneous societies invest more in public goods, indicating a higher level of public altruism. For example, the degree of ethnic homogeneity correlates with the government's share of gross domestic product as well as the average wealth of citizens. Case studies of the United States, Africa and South-East Asia find that multi-ethnic societies are less charitable and less able to cooperate to develop public infrastructure. Moscow beggars receive more gifts from fellow ethnics than from other ethnics. A recent multi-city study of municipal spending on public goods in the United States found that ethnically or racially diverse cities spend a smaller portion of their budgets and less per capita on public services than do the more homogenous cities.
J. Philippe Rushton has complemented kin selection and ethnic nepotism by his genetic similarity theory which proposes that "genetically similar people tend to seek one another out and to provide mutually supportive environments such as marriage, friendship, and social groups. This may represent a biological factor underlying ethnocentrism and group selection". He has also argued that:
[B]ecause fellow ethnics carry copies of the same genes, ethnic consciousness is rooted in the biology of altruism and mutual reciprocity. Thus ethnic nationalism, xenophobia and genocide can become the ‘dark side’ of altruism. Moreover, shared genes can govern the degree to which an ideology is adopted. Some genes will replicate better in some cultures than in others. Religious, political and class conflicts become heated because they affect genetic fitness. Karl Marx did not take his analysis far enough: ideology may be the servant of economic interest, but genes influence both. Since individuals have a greater concentration of genetic interest (inclusive fitness) in their own ethnic group than they do in other ethnic groups, they can be expected to adopt ideas that promote their group over others. Political ethologist Frank Salter refers to ideologies as ‘fitness portfolios’, and psychologist Kevin MacDonald has described co-ethnics as engaging in "group evolutionary strategies."
In Rushton's interpretation it is not clear whether the proposed genetic likeness that supports ethnic nepotism is limited to external appearance, or it also includes other loci. If that is the case, it would be difficult to deduct how similar blood types or creatine levels, or others, among the multitude of invisible phenotype traits, contribute to determine the bonding behavior towards people carrying the alleged similar alleles. Also, there is no clue offered as to which of these specific alleles are the most important for expression of ethnic nepotism. Hamiltonian kin selection (in itself very controversial) refers exclusively to defined sets of discrete behaviors that are innate, not learned and increase the reproductive fitness among very close kin, whereas ethnic nepotism would appear to depend heavily on social interactions and on morphology, or physical characteristics.
According to research by Van der Dennen, "ethnocentrism-cum-xenophobia" seems universally present in preindustrial societies (and in many primate and social carnivore species).
Tatu Vanhanen in his 1999 book Ethnic Conflicts Explained by Ethnic Nepotism empirically examined the relationships between the degree of ethnic homogeneity, the degree of ethnic conflicts, and the degree of democratization in the nations of the world. He found that more ethnically heterogeneous nations had more ethnic conflicts. The degree of democratization explained very little of the degree of ethnic conflicts except that very authoritarian states such as the former Soviet Union and Yugoslavia could suppress ethnic conflicts. Ethnic conflicts were only slightly less common in more economically developed countries. They appeared within all racial groups, cultures, and geographical regions. In Vanhanen's view, people have a genetic tendency to easily learn ethnic attitudes and psychological mechanisms leading to prejudice, scapegoating, and discrimination.
- Cf. The Journal of modern African studies 7 (1969), p. 23 in reference to "ethnic nepotism" among the Mbaise in Nigeria; Audrey C. Smock, Ibo politics: the role of ethnic unions in Eastern Nigeria, Harvard University Press, 1971.
- van der Dennen, Johan M.G. (2000), "Book review of Vanhanen 'Ethnic Conflicts'", Human Ethology Bulletin, 15 (3): 12–14.
- Salter, Frank, On Genetic Interests, p. 125.
- Salter, p. 146.
- Rushton, J. Philipe, "Ethnic Nationalism, evolutionary psychology and Genetic Similarity Theory," Nations and Nationalism, Vol. 11, Oct. 2005. Archived October 15, 2009, at the Wayback Machine
- Stanford Encyclopedia of Philosophy, http://plato.stanford.edu/entries/altruism-biological/
- Axelrod, Robert, "The Evolution of Ethnocentric Behavior," Midwest Political Science Convention, April 16, 2003.
- Brigandt, Ingo, "The Homeopathy of Kin Selection: An Evaluation of van den Berghe's Sociobiological Approach to Ethnicity," Politics and The Life Sciences, Vol. 20, September 2001.
- De Dreu, Carsten K. W., "Oxytocin promotes human ethnocentrism," Proceedings of the National Academy of Sciences, Jan. 10, 2011.
- Lehmann, Ernst, "Genes contribute to patriotism and group loyality," Innovations Report, Nov. 15, 2005.
- Lima, Francisco W.S., Hadzibeganovic, Tarik & Dietrich Stauffer, "Evolution of ethnocentrism on undirected and directed Barabási-Albert networks," Physica A: Statistical Mechanics and its Applications Vol. 388: 4999-5004, December 15, 2009.
- MacDonald, Kevin, "An integrative evolutionary perspective on ethnicity," Politics and the Life Sciences, Vol. 20(1): 67–80.
- Rushton, J. Philipe, "Ethnic Nationalism, evolutionary psychology and Genetic Similarity Theory," Nations and Nationalism, Vol. 11, Oct. 2005.
- Salter, Frank, "Estimating Ethnic Genetic Interests: Is It Adaptive to Resist Replacement Migration?," Population and Environment, Vol. 24, Nov. 2002.
- Salter, Frank, On Genetic Interests: Family, Ethnicity, and Humanity in an Age of Mass Migration (2007).
- Salter, Frank, Risky Transactions: Trust, Kinship and Ethnicity (2002).
- Salter, Frank, "Urban begging and ethnic nepotism in Russia," Human Nature, Vol. 11, June. 2000.
- Salter, Frank (ed.), "Welfare, Ethnicity, and Altruism: New Findings and Evolutionary Theory," (2004).
- Silverman, Irwin, "The Role of Ethnic Nepotism vs. Economic Pragmatism in Inter-group Conflict: Data on the Yugoslavian Civil War," Journal of Bioeconomics, Vol. 3, May 2001.
- Smith, Lars Christian, "Discrimination and Ethnic Nepotism," Conservation Finance, Sept. 13, 2006.
- Vanhanen, Tatu, "Domestic Ethnic Conflict and Ethnic Nepotism: A Comparative Analysis," Journal of Peace Research, Vol. 36, 1999.
- Vanhanen, Tatu, Ethnic Conflicts Explained by Ethnic Nepotism (1999).
- van den Berghe, Pierre L., The Ethnic Phenomenon (1981).
- Wade, Nicholas, "Depth of the Kindness Hormone Appears to Know Some Bounds," New York Times, Jan. 10, 2011.
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