Boston

THE drastic rise in the price of oil and gasoline is in part the result of forces beyond our control: as high-growth countries like China and India increase the demand for petroleum, the price will go up.

But there are factors contributing to the high price of oil that we can do something about. Chief among them is the effect of “pure” speculators — investors who buy and sell oil futures but never take physical possession of actual barrels of oil. These middlemen add little value and lots of cost as they bid up the price of oil in pursuit of financial gain. They should be banned from the world’s commodity exchanges, which could drive down the price of oil by as much as 40 percent and the price of gasoline by as much as $1 a gallon.

Today, speculators dominate the trading of oil futures. According to Congressional testimony by the commodities specialist Michael W. Masters in 2009, the oil futures markets routinely trade more than one billion barrels of oil per day. Given that the entire world produces only around 85 million actual “wet” barrels a day, this means that more than 90 percent of trading involves speculators’ exchanging “paper” barrels with one another.

Because of speculation, today’s oil prices of about $100 a barrel have become disconnected from the costs of extraction, which average $11 a barrel worldwide. Pure speculators account for as much as 40 percent of that high price, according to testimony that Rex Tillerson, the chief executive of ExxonMobil, gave to Congress last year. That estimate is bolstered by a recent report from the Federal Reserve Bank of St. Louis.