Final answer:
Enrico has been called a top performer because he regularly produces more than the other workers on the assembly line. This can be attributed to the concept of specialization and expertise.
Step-by-step explanation:
Enrico has been called a top performer, because he regularly produces more than the other workers on the assembly line. This phenomenon can be attributed to the concept of specialization and expertise. When workers specialize in certain tasks, they become more efficient and productive, leading to higher quality output. Specialized workers often come up with innovative ways to complete their work faster and better.