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Published online 27 August 2008 | Nature | doi:10.1038/news.2008.1064
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Children learn rules of equality by age eight
But those with siblings are more selfish than those without.
Children become more egalitarian as they get older, learning the principles of equality by the age of eight, according to a study by Swiss scientists. That may not be too surprising to anyone who has kids - but the researchers also found that having older siblings actually tends to make children more selfish, and that children with no siblings are the least selfish.
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Recently, we repeat the game in chinese children in Hangzhou, China. We notice that the Fehr's candy-share game is a PD game, and also a 2-person public goods game at the bottom. Expectically, we notice that, the (1,1) vs (1,2) case, the Fair option(1,1) is a Cheating option mathematically.