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Counting oil flow can be a crude science

But competing analysis of that data often results in different outcomes

OUTPUT DATA: The industry counts on a small group of little-known companies whose main job is to count the number of tankers leaving ports, at best using data gathered from satellites, at worst using simple binoculars.


JUDGING the supply of the world's most important commodity often comes down to a good set of binoculars.

In a world of Twitter, iPhones and instant information, determining how much oil is pumped by global producers is a moving target.

It relies on a 50-year-old...

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