Research shows that we overestimate the extent to which others agree with us, and underestimate the degree to which we are following everyone else.
Times, Sunday Times
We tend to overestimate the extent to which other people are confident.
The Sun
The false-consensus effect occurs when individuals overestimate the extent to which other people share their opinions, attitudes, and behaviors.
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Individuals tend to overestimate the extent to which their contributions make an impact on those around them.
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I may have overestimated the extent of his influence in his homeland.
Times, Sunday Times