What's the worst mistake people make?

Being careful is a virtue. It helps avoid mistakes. Now, of course, mistakes allow you to learn - but, the point of learning is also to cut down on your mistakes.
 
That makes sense. Paralysis by analysis. It is apparently true that those willing to make decisions - even if mistaken - are more effective than those afraid to make any decisions.
 
Looking too occupied is a mistake? At work, it gives you the appearance of working. At home, this might very well be a mistake.
 
Wishful thinking!

People are systematically biased in favour of wishful thinking because it has evolutionary value to be optimistic. But in many people's lives it will sooner or later lead to a major miscalculation.
 
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