A year ago, in response to ongoing complaints of pickpocketing at New City’s busy central train station, the city’s police department erected prominent signs throughout the train station warning passengers to beware of pickpockets. As soon as the signs were erected, however, the reported incidence of pickpocketing, per passenger, at the station immediately rose to three times the previous rate—and stayed at the new, higher figure until the signs were removed six months later. As soon as the
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