Why People Are So Confident When They're Wrong

overconfidence is a bias

Overconfidence is a cognitive bias where people overestimate their abilities. It's not just arrogance; it's often a mental shortcut when brains are overwhelmed by complex information or limited processing capacity.

• 🇦 🇺 Australia is wider than the Moon, but 60% of people incorrectly thought the Moon was wider.
• ⭐ There are 200 billion stars in the Milky Way, but 3 trillion trees on Earth. Most people guessed more stars.
• 📉 Experts are also overconfident; professional forecasters often say they're 53% sure of predictions but are only right 23% of the time.
• 🧠 Overconfidence can be advantageous, improving social status and making people more likely to be chosen as leaders.
• 💡 The Dunning-Kruger graph often seen online is a meme, not the actual research finding, which shows a less dramatic effect.

A man looks skeptically at the camera, with two bars showing poll results: 'The Moon is wider' (60%) and 'Australia is wider' (40%).