In Pam's mind, t-shirts and exercise lessons are interchangeable items. The number of lessons she attends and the number of t-shirts she buys will both drop as a result of this.
This is further explained below.
Generally, A product or service that increases the overall value of another is known as a complementary good. In other words, they are two different products that the end user operates in conjunction with one another. For instance, breakfast cereal and milk, or a DVD and a device that plays DVDs. On occasion, the product that complements the primary item is required in order for the primary item to be used, as is the situation with gasoline and a vehicle.
In conclusion, T-shirts and gym memberships are two things that Pam views as being complimentary to one another. Her desire for t-shirts and gym lessons will both fall as a result of this change in her amount of participation.
Read more about complementary goods.
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