CODEXCard 1 of 5 · 5 Laws of Stupidity
Cipolla first law of stupidity (First Law - Underestimation)
We always underestimate how many.
Cipolla's first law of stupidity states that we always underestimate how many stupid people are around us. In his sense, stupid means acting in ways that harm others with no gain to oneself. The law claims that whatever share you guess, the real share is higher, in every kind of group.
The reason is simple optimism. We tend to picture other people as roughly like ourselves on a good day: informed, careful, and pursuing sensible goals. Real behaviour is messier. People are tired, distracted, or careless, and some act against their own interest as often as against yours. Cipolla framed this as a statistical warning. If your plan only works when everyone behaves sensibly, it will eventually meet someone who does not.
The common mistake is to turn the law outward and use it as a label. Calling colleagues or strangers stupid feels clever, but it teaches you nothing and it closes doors. The law is meant for your own calibration. It should change how you design a process, how many checks you include, and how much slack you leave, not how you talk about people.
Read this way, the first law is close to the engineering habit of designing for failure. You do not expect every part to break, but you make sure the system survives when one does.
Example
You organise a group trip and send clear instructions about the meeting time. A careful planner assumes a few people will still misread them, so you add a reminder the night before, share a map pin, and build a fifteen minute buffer before the train. Nobody is blamed, and the trip leaves on time.
Try it this week
Pick one plan you have this week and ask what happens if one person in it acts carelessly, then add a single safeguard.
From 5 Laws of Stupidity (Carlo M. Cipolla · 1976).
