Oliver Will

Rainer Hegselmann

English

Research Papers in Economics

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Oliver Will and Rainer Hegselmann (2008)
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Journal of Artificial Societies and Social Simulation vol. 11, no. 4 13
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Received: 21-Oct-2008    Accepted: 21-Oct-2008    Published: 31-Oct-2008
1.1
In their original PNAS article Macy and Sato (2002) make it clear that their main point
concerns social mobility (see, for instance, the abstract and the last section). Their central
claim is the non-monotonic effect of mobility: with moderate mobility, they maintain, trust
can be established; with too much mobility, trust and trustworthiness are undermined — and
therefore their "warning flag to the U.S." (7229). Exactly that effect turned out to be not
replicable.
1.2
In their reply, only paragraph 1.38 comments on our non-replicability result: they claim to
like our contradicting result even more than their own from their theory's point of view. We
are happy that we could do Macy and Sato a theoretical favour. It is a pity, though, that Macy
and Sato do not provide any hint why under what we think to be their own assumptions their
original non-monotonic effect of mobility could not be replicated.
 References
MACY M and Sato Y (2002) Trust, cooperation and market formation in the US and Japan.
Proceedings of the National Academy of Sciences, 99, pp. 7214-7220.
MACY, Michael and Sato, Yoshimichi (2008). 'Reply to Will and Hegselmann'. Journal of
Artificial Societies and Social Simulation 11 (4) 11
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