Intangible property

According to Oliver Goodenough (can that be his real name?) people possess domain-specific capacities in their evolved psychology for tangible property, tied to their emotions. And culture and law have tried to expand the notion of property into other domains - e.g. intellectual property – that probably have much weaker links to the emotions. He therefore argues speculates that intellectual property, although a good idea formally, is might be too new for people to respect. So people who would never normally steal will swap files, even if it's behaviour characterisable as theft.

Noted during Oliver Goodenough's Natural Born Lawyers talk, at The Place of Value in a World of Facts

Also gleaned at The Place of Value in a World of Facts: A recent study by Frans de Waal - reported in Nature - shows that Capuchin monkeys have a sense of fairness