Perhaps you're bringing your unique knowledge and gaining access to someone else's professional network, or maybe you're able to learn a new skill by working with someone.
Some workers, like Jane Matheson, are retrained to handle the new equipment, but often a whole new set of skills is required and that means a new, and invariably smaller set of workers.
Gazda hypothesizes that copying didn't indicate a lack of artistic imagination or skill on the part of Roman artists, but rather the Romans made copies because they admired Greek sculpture.
For the college student, the most helpful of these skills include making use of the various aids to understanding that most textbooks provide and skim reading for a general survey.