Many people I know are making so much money (regular money, but they're single / not living lavishly so it adds up quickly) in tech that they work a few years and then quit for as long as they feel like it. They can only be accounted for as half a person's worth of workforce if they're only worked half the time.
(And really the only reason I think most people don't do this is the godawful state of American health insurance.)
(And really the only reason I think most people don't do this is the godawful state of American health insurance.)