22.6%
Amount waitresses can increase their tips by standing 0.6 meters closer to patrons (0.15 meters away versus 0.75 meters), according to a study by the University of Southern Brittany in France. Researchers say close proximity is one of four nonverbal ways for waitresses to boost tips, the others being smiling broadly, touching customers briefly on the arm or shoulder, and squatting next to the table when introducing themselves.
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