People offering a service often overestimate the degree to which people need the service because they are in a good position to learn about the people most in need. Remembering these people but ignoring others who do not need the service is an example of

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The decision heuristic, availability, is the tendency to overestimate the likelihood of events that are easily recalled. In this case, the people offering the service are more likely to remember the people who are most in need, and they may overestimate the degree to which people need the service as a result.

People Offering a Service Often Overestimate the Degree to Which