As oil prices soared to record levels in recent years, basic economics suggested that consumption would fall and supply would rise as producers opened the taps to pump more.

But as prices flirt with $120 a barrel, many energy specialists are becoming worried that neither seems to be happening. Higher prices have done little to attract new production or to suppress global demand, and the resulting mismatch has sent oil prices spiraling upward.

“According to normal economic theory, and the history of oil, rising prices have two major effects,” said Fatih Birol, the chief economist at the International Energy Agency, which advises industrialized countries. “They reduce demand and they induce oil supplies. Not this time.”

A key reason that supply is not rising to meet demand is that producers outside of the OPEC cartel  countries like Russia, Mexico and Norway  have been showing troubling signs of sluggishness. Unlike the Organization of the Petroleum Exporting Countries, whose explicit goal is to regulate supply to keep prices up, the other countries are the free traders of the international market, with every incentive to produce flat-out at a time of high prices.