@cshentrup @jwmason externalities are very squishy things, esp for something as broad as "intellectual property". does the movie ET have positive externalities, or is the surplus shared between producer and the entertained? maybe textbooks do, because an educated public. how about MS Office? is there some externality because business is more productive? how about Twitter? are there negative externalities of influence and addiction?

@cshentrup @jwmason by leaks, do you just mean the fact of "piracy" is a positive externality? i might enjoy ET after torrenting it, internal to know economic transaction but there's a benefit?