Should The Oil Price Drop In 2008 Have Been Investigated?

See Good Question About Oil Traders at Carpe Diem.

This prompted a great question in the WSJ.

"WSJ Letter to the Editor from John Malgar -- "The challenge for investigators isn't proving that traders drove up oil prices. The real puzzle is, why did these public enemies suddenly have a change of heart during 2008 and drive prices down?"

See chart above showing gas prices falling from $4.12 per gallon to $1.61 in 2008."