Definitely a fair criticism. In the paper we test for experimenter effects (are the results different for male vs female research assistants? Are some researcher assistants acting differently in a way that might bias the results?) and do not find any meaningful differences. But this doesn't get to your broader point about the homogeneity of our research assistants (all are undergrads from Western Europe, etc).My sense is that our results probably serve as a lower bound on reporting rates -- if the person who dropped off the wallet comes across as a local, reporting rates would be higher. But this is pure speculation.
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