The speed at which occupational change occurs matters enormously. Labor markets have a natural adjustment rate—if careers last 30 years, roughly 3% of people retire yearly without layoffs. If an occupation disappears over 20 years, it's manageable; if it disappears in 7 years, it creates serious unemployment. Autonomous vehicles eliminating 3 million truck drivers overnight would be catastrophic, but over 25 years it's manageable.