Proximity Bias

Proximity bias is a "birds of a feather" phenomenon. It's the tendency for people to overestimate the prevalence of social phenomena because they "flock" with those that are like us. My favorite illustration is smoking prevalence. Ask a smoker what proportion of Americans smoke and smokers will give a high estimate. Smokers have smokers as friends so they think the world is like them.

As a non-smoker the same question and you get a very low estimate because non-smokers tend to hang out with non-smokers.

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