The illusion of confidence.

by expoƒunction

The illusion of confidence has two distinct but related aspects:

First … it causes us to overestimate our own qualities, especially our abilities relative to other people.

Second … it causes us to interpret the confidence (or lack thereof) that other people express, as a valid signal of their own abilities, of the extent of their knowledge, and of the accuracy of their memories.

Chabris & Simons, 2009, p.85