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Date: | Fri Mar 31 17:18:28 2006 |
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----------------- HES POSTING -----------------
The original question was about definitions other than product
substitutability. Common usage (and hence official statistics) often refers
to elements of joint production or at least commonality of materials,
skills, technology, etc. Thus the oil industry produces outputs that are
not substitutes in use (lubricants, fuels, chemical feedstocks), but are
all produced by refining crude oil. Again, a company that already produces
motor vehicles is better placed to produce other motor vehicles than a
pharmaceutical or a textile business, hence the 'motor industry'. I don't
have any references to the history of this approach, though it seems too
well entrenched in everyday usage to need them.
Tony Brewer
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