Final answer:
The tendency to rely on easily accessed information as a proxy for the information you really need is known as the availability heuristic.
Step-by-step explanation:
The tendency to rely on easily accessed information as a proxy for the information you really need is known as availability heuristic. The availability heuristic refers to the tendency to evaluate new information based on the most recent or most easily recalled examples. This means that people often rely on information that is readily available to them, such as recent experiences or vivid stories, even if it may not be the best example or representative of reality.