.
Someone , I think it was Rockman , pointed out that nobody use crude , everybody use refined products
refining is a big industry , a critical industry
the "West " used to be the big exporters of oil products ,
now all the big refineries are being build by other people ,
the old refineries often enough are closed down .
importing products means ,
it's more costly for the trade balance ,
there is more unemployment at home,
there is an erosion of technical ability