Trust in society
Norway is based on a high level of trust. Norwegians not only trust each other, when you ask you will find that most of the population have a high level of trust to the Norwegian authorities. Thanks to very low corruption, well-functioning institutions and access to public education, social security and services the trust spreads into society.
Lost items are often returned and some places you will find stores and public libraries that work on the honour system. You can unlock the libraries outside of opening hours and let yourself in. Food and flowers are left outside the stores with the owner trusting that you'll pay for it. You have to admit that this is quite unique, at least in a big city.