A man starts work as a factory supervisor. Twenty years later the factory closes and he ends his career as a night watchman. Classify his mobility.
- His rank changed, so the mobility is vertical, not horizontal.
- A watchman ranks below a supervisor in pay and prestige, so the direction is downward.
- The comparison is between two points in his own career, not with his father.
Answer: Downward vertical, intragenerational mobility.