The article discusses how the connection between production costs and the production function is often not well explained in many economics textbooks. Some texts only briefly touch on this important concept, making it hard for students to grasp. The best explanations are found in introductory texts, but even upper-level students struggle with understanding the link between input and output, as well as concepts like marginal revenue and marginal cost. The authors suggest that clearer explanations and more detailed examples are needed at the intermediate level to help students better understand these key economic principles.