John Ternus, Apple's incoming CEO, has worked at exactly one company since graduating college in 1997. Satya Nadella joined Microsoft two years after his master's degree.

Andy Jassy spent 24 years at Amazon before reaching the top job. Three of tech's most powerful companies are run by people who never really left.

Over the past three decades, career guidance has instead preached that loyalty is a weakness and job hopping is the way to advance. This was established as big businesses moved away from........

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