But economists—and workers shut out of fields by educational requirements or difficult exams—say licensing mostly serves as a form of protectionism, allowing veterans of the trade to box out competitors who might undercut them on price or offer new services.
"Occupations prefer to be licensed because they can restrict competition and obtain higher wages," said Morris Kleiner, a labor professor at the University of Minnesota. "If you go to any statehouse, you'll see a line of occupations out the door wanting to be licensed."...
Texas, for instance, requires hair-salon "shampoo specialists" to take 150 hours of classes, 100 of them on the "theory and practice" of shampooing, before they can sit for a licensing exam. That consists of a written test and a 45-minute demonstration of skills such as draping the client with a clean cape and evenly distributing conditioner. Glass installers, or glaziers, in Connecticut—the only state that requires such workers to be licensed—take two exams, at $52 apiece, pay $300 in initial fees and $150 annually thereafter.
California requires barbers to study full-time for nearly a year, a curriculum that costs $12,000 at Arthur Borner's Barber College in Los Angeles. Mr. Borner says his graduates earn more than enough to recoup their tuition, though he questions the need for such a lengthy program. "Barbering is not rocket science," he said. "I don't think it takes 1,500 hours to learn. But that's what the state says."
Many, many other examples -- it takes 750 hours of training to be a manicurist in Alabama. Somehow my daughter learned to paint her own nails during the course of a single sleepover.