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system
is stock in a company considered a good or a service, or something else?
user
facebook the company is probably better understood as a capital good - it is a collection of software and servers and a well-known brand name with a snazzy network effect under reasonably competent corporate governance that can produce final goods and services (mostly services) that actually have value. a share of facebook stock is a share of ownership in that capital. see also: http://en.wikipedia.org/wiki/capital_good which makes some concessions for the difference between capital goods and capital services, so it's kind of a fuzzy thing.
assistant