What is the primacy effect?

Primacy effect is a cognitive bias where the initial items in a sequence are perceived and remembered better than subsequent ones. In the context of A/B testing and product management, this means that users may respond more strongly to the first options or information presented.

For example, if a specific set of features or offers is shown first in an interface, they may have a greater influence on user behavior than those shown later. It is important to consider this when designing experiments and prioritizing interface elements to avoid data distortion and to ensure correct interpretation of results.