Final answer:
Consumer dissatisfaction due to failed product differentiation when a customer perceives no change in the taste of an advertised new improved flavor.
Step-by-step explanation:
When a customer is dissatisfied because they perceive no change in the taste of a drink that has advertised a new improved flavor, this is an example of consumer dissatisfaction due to failed product differentiation. It can be attributed to the intangible aspect of product differentiation, where advertising plays a role in shaping the customer's preferences for certain brands. Despite the brand's promise of an improved flavor, the customer's expectations were not met, leading to dissatisfaction.