Ineffective social and political institutions make people more likely to favour their family and own local social group, while good institutions make them more likely to follow impersonal rules that are fair to everyone, suggests a new study.
A series of experiments found that people in societies with supportive government services, food security and institutions that meet their basic needs were very likely to follow impartial rules about how to give out money.
By contrast, those without effective, reliable institutions showed favouritism toward members of their local community.
"You're just trying to survive in a world where there's no higher-level governmental institutions you can depend on," said Henrich.
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The study, done in Bangladesh, Bolivia, Fiji, China, Iceland and the US, tested motivations using a game.
Researchers gave subjects half a day's wages in cash and placed them before two cups.
Played fairly, the game would result in both cups having the same amount of money at the end. Researchers made sure individual players knew that no one could see them cheating while the game was being played.
But statistical analysis after the game was over detected whether allocation biases or "cheating" had taken place.
The study found that people from countries with effective institutions followed the rules, while people from countries with poor institutions were biased in in favour of community members.
In a Bangladeshi village, the subjects allotted 55.7 per cent of the money to their fellow villagers. At a US church, the congregation ended up with 50.1 per cent of the share.
"In a world with well-functioning institutions, this gets inside of people and actually affects their basic motivations, even when they're in a situation when no one is watching," Henrich said.
The study was published in the journal Human Nature.