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Why are oil prices so high and volatile? McClatchy’s Kevin Hall and Robert Rankin take a look at the evidence and say that neither supply problems, demand levels, nor Middle East turmoil really seem to explain it. The answer, rather, is a huge growth in Wall Street speculation:

Some 70 percent of contracts for future oil delivery are now bought by financial speculators — largely big investment banks and hedge funds — who never take control of the oil. They just flip the contract for a quick profit.

….Exxon Mobil Chief Executive Rex Tillerson noted Thursday in testimony before the Senate Finance Committee that this year’s oil prices don’t make any economic sense, though that’s not quite how he put it. He said that current fundamentals and production costs would dictate oil in the range of $60 to $70 a barrel. That’s at least $43 cheaper than this year’s highs of $113 a barrel reached on April 29 and May 2.

….Prior to the 1990s, speculators made up about 30 percent of the futures market. In the latest reporting period, the ratio on May 3 stood at 68 percent speculators to 32 percent users of oil. Meanwhile, the volume of total reported trades has grown five-fold since 1995, underscoring the impact of speculation on futures markets.

“It tells me that there are more speculative positions than there has ever been in history, particularly in the energy sector, I don’t mean only crude oil,” said Bart Chilton, a CFTC commissioner who thinks excessive speculation is at least part of the cause of soaring oil prices. “In all of the energy sector, we’ve seen a 64 percent increase in speculative positions since the (oil price) high of 2008.”