An employer may require a diploma, professional license or academic degree, say, for a job which can be done perfectly well applying skills acquired through experience or informal study. Since blue-collar types of work have relied more commonly upon the apprentice system for confirmation of skills, the phenomenon is considered more prevalent among employers of white-collar labor.
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- Woodward, Orrin & Oliver DeMille 'LeaderShift: A Call for Americans to Finally Stand Up & Lead" Grand Central Publishing 2013