In economics, we often focus on the margin of a problem, so the presentation of marginal product comes before the presentation of average product. Why do you think we want you to learn about the average product of labor?
Answer: Yes, marginal product is a very important way to look at the decision to hire one more worker or let one worker go. But average productivity gives us a good way to summarize the overall productivity of our workforce. It allows us to take a step back and look at the bigger picture.