Module 2 Lesson 4: Diminishing Marginal Utility and You! Discussion . Think about a good or service that you purchase on a regular basis. . Identify at least one alternative to that product and explain the price of that good can affect demand for the substitutes. . Now identify a good that is often consumed with another good or service (for example, peanut butter and jelly are complementary goods). . How does the price of the complementary good affect the demand for the good you selected originally? . In your post, explain the relationship between the two goods in the two scenarios above. Discuss how a price change for one good can affect demand for another. Please note, anytime you only have a price change for product X, that is a CHANGE IN QUANTITY DEMANDED. If the price of a related good changes, that is a CHANGE IN DEMAND