For the most part, states have been moving toward making it easier for people to switch teams... The most extreme end of the spectrum is California, which prohibits noncompete agreements entirely. Economists say this was a crucial factor behind Silicon Valley's rise, because it made it easier for people to start and staff new businesses. But as states like Utah and Massachusetts have tried to move closer to this approach, legislators have run into mature companies trying to hold onto their best employees... A recent survey showed that one in five American workers is bound by a noncompete clause. They cover workers up and down the economic spectrum, from executives to hairdressers.
Two economists tell the newspaper that since 2000, U.S. workers have changed their jobs less and less, which is sometimes blamed on strict employment contracts as well as the occupational licensing laws which affect a third of America's workforce. The Times reports that noncompete clauses ultimately end up keeping workers' salaries lower, "because most people get raises when they switch jobs."