An excellent post from Orgtheory.net:

From The New Scientist, some research showing that people prefer cockiness to expertise:

The research, by Don Moore of Carnegie Mellon University in Pittsburgh, Pennsylvania, shows that we prefer advice from a confident source, even to the point that we are willing to forgive a poor track record. Moore argues that in competitive situations, this can drive those offering advice to increasingly exaggerate how sure they are.

But this is pretty dangerous! Orgtheory.net also reminds us of:

(…)a famous paper by Kruger and Sunning showed, people who are bad at what they do are generally also incapable of understanding that they suck — and this directly contributes to inflated self-perception. So, incompetence tends to make people cocky and people prefer cocky judgements over demonstrated expertise, which is pretty much the worst of both worlds.

And this is Krueger and Sunning famous paper:

Unskilled and Unaware of It: How Difficulties in Recognizing One’s Own Incompetence Lead to Inflated Self-Assessments.

Justin Kruger and David Dunning / Cornell University

People tend to hold overly favorable views of their abilities in many social and intellectual domains. The authors suggest that this overestimation occurs, in part, because people who are unskilled in these domains suffer a dual burden: Not only do these people reach erroneous conclusions and make unfortunate choices, but their incompetence robs them of the metacognitive ability to realize it. Across 4 studies, the authors found that participants scoring in the bottom quartile on tests of humor, grammar, and logic grossly overestimated their test performance and ability. Although their test scores put them in the 12th percentile, they estimated themselves to be in the 62nd. Several analyses linked this miscalibration to deficits in metacognitive skill, or the capacity to distinguish accuracy from error. Paradoxically, improving the skills of participants, and thus increasing their metacognitive competence, helped them recognize the limitations of their abilities.