If you ran a fancy restaurant, would you want the chef also to clean dishes and mop the floor? Of course not. You’d hire others to do these things and let the chef focus on producing delicious food. This simple idea — that one should match the skill level of the individual to the skill requirements of a task — has influenced how many businesses operate. That’s why lawyers are helped by paralegals, professors by teaching assistants, and chefs by sous chefs.