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Science 27 July 2007:
Vol. 317. no. 5837, pp. 464 - 465
DOI: 10.1126/science.1143918
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Perspectives

ECONOMICS:
Spying on Others Evolves

Manfred Milinski and Bettina Rockenbach

Watchful eyes induce altruistic behavior and an "arms race" of signals between observers and the observed.

1M. Milinski is in the Department of Evolutionary Ecology, Max Planck Institute for Evolutionary Biology, D-24306 Plön, Germany. E-mail: milinski{at}mpil-ploen.mpg.de

2B. Rockenbach is in the Department of Economics, University of Erfurt, D-99089 Erfurt, Germany. E-mail: bettina.rockenbach{at}unierfurt.de

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Science. ISSN 0036-8075 (print), 1095-9203 (online)