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It is my opinion that most changes in energy prices are caused by market factors- expected changed in demand for example. But I am also concerned that speculators cause the extent of the swings in these directions to be amplified to much more than they would naturally tend to go. Without data to support me, I would guess that the percent of total volume traded coming from investors is much greater than it used to be compared to that bought by companies and businesses trying to lock in future prices on oil they actually intend to use.
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I add new pictures to my photo gallery pretty regularly. You can see them here if you are interested: http://www.pbase.com/jeffryz 
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