Only a fully tenured professor like Cornell’s Michael Lynn would dare publish a research paper whose top-line findings show that quality of service has a negligible effect—less than two percent—on a waitress’s tip. The actual determinants: bra size (bigger is better), hair color (blonde matters most), and waist-to-hip ratio (i.e., slender and curvaceous prevails). Be sure to consult your company’s HR specialist and attorney before bringing this subject up at your next front-of-the-house ...

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