How important is reciprocity for climate policy?

The Paris Agreement relies on voluntary and therefore weak commitments. But contrary to popular belief, if some countries "free-ride", this does not undermine the commitment of others, writes Thomas Bernauer.

Behaviour study shows rats know how to repay kindness

If I scratch your back and you scratch mine, then we're both better off as a result – so goes the principle of reciprocity, one of the most popular explanations for how co-operative behaviour has evolved. But what if one ...

Anthropologists study the genesis of reciprocity in food sharing

When you share your lunch with someone less fortunate or give your friend half of your dessert, does that act of generosity flow from the milk of human kindness, or is it a subconscious strategy to assure reciprocity should ...

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