write a essay about Ch. 1 In the Spotlight - Principles of Marketing | OpenStax Details Look under Product, Promotion, Price, and Place you will see 3 Unit Introduction Click on 3 Unit Introduction Complete the following Learning Outcomes By the end of this section, you will be able to: 1 Differentiate between products, services, and experiences. 2 Describe how consumer and business/industrial products are classified. 3 Identify the four levels of a product. Knowledge Check Learning Outcomes 1 Define product items, product lines, and product mixes. 2 Describe product line length and depth. 3 Discuss product line filling and product line stretching. Knowledge Check Learning Outcomes 1 Define the product life cycle. 2 List and describe the stages of the product life cycle