Skip to content
An official website of the OECD. Find out more

The tale of the ‘erasable pen’ Say you have a doctor, an engineer, and a lawyer all sitting in a room. These three professionals work for the same firm and head office told them that company may now only operate with either pens or pencils. They have to make the decision. Their conversation goes like this: Engineer: I vote for more pencils because with pencils I can erase my mistakes if I make an error...