You left out a few information purchases: education, much of medicine, all of financial services, design, marketing, supervision, and management.
Indeed. Some years ago I ran into a guy at Newark Airport who was on his way to Barbados. We struck up a conversation, and it turned out that he ran a data entry business. He ships documents of various kinds to Barbados where workers convert them to machine-readable form and return the tapes. I asked why Barbados. The answer was very simple: it's about the only English-speaking third-world country in the western hemisphere with a decent literacy rate (99%, according to my National Geographic atlas). The economy was bad, and the people were happy to get the work. This got me thinking about the impossibility of regulating and taxing the international transmission of information. At the time I was thinking more in terms of the impossibility of enforcing US import duties; who's to say what a particular magtape is worth? If this guy is still in business I suspect he has long since replaced physical magtape shipments with electronic transfers, which bypasses Customs completely. I suspect there are many other similiar operations, and the trend is strongly positive. Phil