The University of Southern Brittany polled male diners and found that tips given to blond waitresses are generally 25 percent larger than the ones left for their brunette colleagues.
Nicolas Guegen told the local.fr his project involved putting different-color wigs on the same servers so the level of service would not vary.
At the same time, female diners were consistent in their gratuities regardless of the color of their waitresses' locks.
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