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Competitive altruism: from reciprocity to the handicap principle Gilbert Roberts Evolution and Behaviour Research Group, Department of Psychology, University of Newcastle uponTyne, Newcastle uponTyne NE1 7RU, UK (gilbert
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Competitive altruism: from reciprocity to the handicap principle Gilbert Roberts Evolution and Behaviour Research Group, Department of Psychology, University of Newcastle uponTyne, Newcastle uponTyne NE1 7RU, UK (gilbert