Final answer:
The fact that people prefer letters appearing in their own name illustrates the mere exposure effect.
Step-by-step explanation:
The fact that people prefer letters appearing in their own name illustrates the mere exposure effect. The mere exposure effect refers to the phenomenon where people develop a preference for things that they are familiar with or have been repeatedly exposed to. This effect can be seen in various contexts, such as letters in one's own name, familiar faces, or even certain brand names or logos.