My aim is to measure down stream oil and gas as a ratio of up stream, first. Then to observe ratio of down stream to GDP, Exports and its share in overall employment.
One general approach is to distinguish between wholesale and retail. Another way is to separate production from distribution. For the oil and gas industry, retail level may include gasoline, natural gas, diesel, grease, jet fuel, any refining and distribution. For some firms, refining may be classified as mid-stream.
In the US, industries are now classified under the NAICS codes, which replaced the SIC codes subsequent to the formation of NAFTA in 1994. Usually the number of digits of these codes give some ideas about the levels of operations. You may be able to get a ratio between two classifications.
Many thanks Professor Ramrattan for your brief answer. Can you suggest some useful reference containing further details on measurement and accounting of DSI? Even then your answer is very complete. Thanks once again.
Hasan M Mohsin
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