Oddly Wired
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self perception

You believe your virtues are rarer than they actually are.

The false uniqueness effect causes people to underestimate the number of others who share their positive personality traits.

You want to feel special, so your brain rationalizes that your skills or ethical standards are exceptional. Research shows that most people believe they are more cooperative and more moral than the average peer.

We all think our good intentions are a unique commodity.

Where this comes from

Study
Suls and Wan, 1988
What the check found
The attribution to Suls and Wan (1988) is accurate, though the study also included Sanders as a co-author. The effect is correctly identified as an underestimation of peer participation in desirable traits.
Confidence
Well replicated
self-perceptionegotismfalse uniqueness

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.