Final answer:
Intel's success with the "Intel Inside" advertising campaign is an example of a barrier to entry called product differentiation.
Step-by-step explanation:
The success of Intel with their "Intel Inside" advertising campaign can be classified as a barrier to entry called product differentiation. Product differentiation refers to the strategy of creating a unique product or brand that sets it apart from competitors. Intel's logo appearing on many brands of PCs differentiated them from other computer processors and created a recognizable and trusted brand name, making it difficult for other companies to compete.