Though shifts in demand and reduced production by some major producers have influenced oil prices, investor behavior is also increasing market volatility.

Backgrounder: Economists say Iran’s mismanaged energy sector and falling oil prices could have consequences for its economy.

Political volatility among the world’s leading oil producers suggests deeper causes for recent price spikes.

In a region seen as turning leftward, forging alliances would seem a natural course of events. But Bolivian President Evo Morales’ decision to nationalize the oil and gas industry is exposing tension…