You've noticed this pattern: the beginner is cautious. The intermediate person is confident. The expert is cautious again.
There's actual psychology behind this, and it explains why your boss makes worse decisions than your coworker who just started.
The Dunning-Kruger Mechanism
Most people understand Dunning-Kruger as "incompetent people are overconfident." That's true but shallow.
The deeper truth is: Your confidence peaks at exactly 40 hours of knowledge.
- At 10 hours, you don't know enough to be confident. You don't know what you don't know.
- At 40 hours, you know enough to generate ideas and feel right about them. But you haven't encountered all the ways those ideas can fail. So you're confidently wrong.
- At 200 hours, you've seen enough edge cases and failures that you become cautious again. You know exactly how much you don't know.
- At 10,000 hours, you might become confident again — but it's a different kind of confidence. It's calibrated to real risk.
Why This Ruins Decision-Making
In organizations, the 40-hour people make the decisions.
They're confident enough to push ideas forward. They're not experienced enough to see all the problems. So they push forward with something that fails in predictable ways that experts would have caught.
I've seen this in:
Hiring: The hiring manager with 3 years of experience is confident in their instincts. The experienced recruiter is skeptical.
Product: The PM with 18 months of context is confident about what customers want. The designer who's been doing this for 10 years keeps asking clarifying questions.
Investing: The person who made money on 2-3 trades is confidently buying. The investor with 20 years of cycles is cautious.
The Real Antidote
It's not "get more experience." (That happens naturally; that's not the fix.)
The real antidote is: Seek out the 200-hour people's objections before you commit.
Not their advice. Their objections.
An expert doesn't usually tell you "do this." But they can tell you "I'm concerned about X" — and that concern is worth 1,000 confident ideas.
The second antidote is harder: Acknowledge that your confidence is proportional to your ignorance.
When you feel most right, you're most likely wrong in a way you haven't discovered yet.
I built a psychology quiz (Mind Traps at https://ordinarymantrying.com/tools/mind-traps.html) with 40 psychological laws and real scenarios. The pattern that emerged: people are most confident about the biases that trip them up most. The people who get Dunning-Kruger wrong are the ones most convinced they don't fall for it.
Confidence isn't a sign you're right. It's often a sign you haven't been wrong yet.
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