IICognitive Bias
Anchoring Bias
Your bias is Anchoring. Overweighting the first number or idea introduced.
Why This Bias Happens
The first impression becomes a mental landmark. Once set, the mind adjusts from it too little, because revision costs effort and certainty feels efficient.
Example 1
In Meditations, Marcus Aurelius urges himself to inspect impressions before consenting to them. That practice counters anchoring by refusing to treat first appearance as final truth.
Example 2
Kahneman and Tversky showed that random starting numbers influence later estimates, even when people know the anchor is arbitrary.