There are a number of reasons why oil traders feel that oil supplies might be reduced. One of the most important is growing turbulence in the Middle East, the world's largest oil producing region. The war in Iraq, Iran's nuclear program, and internal instability in Saudi Arabia could all lead to a dramatic fall in the supply of oil. Outside the Middle East other oil producers with their own issues have caused worry for investors, such as the strikes and political problems in Venezuela and potential instability in West Africa.

In late August, 2005, Hurricane Katrina crippled the supply-flow from off-shore rigs in the Gulf Coast, the largest source of oil for the domestic U.S. market. Short-term shutdowns because of power outages knocked out two major on-shore pipelines, and at least 10% of the nation's refining capacity was not operating in the wake of the storm. Gas prices in the region, normally 70 cents below the national average, were at $3.12 on August 30.

World supply (specification) came in at 83 million barrels a day during 2004 in department of energy EIA calculations. This rate of increase is faster than that of any other date in the past. Despite this there is increasing discussion of peak oil and the possibility that the future may see a reduced supply of oil. Even if oil supplies themselves are not reduced, some experts feel the easily accessible sources of light sweet crude are almost exhausted and in the future the world will depend on more expensive sources of heavy oil and alternatives.

The short term price of oil is partially controlled by the OPEC cartel and the oligopoly of major oil companies. One other important cause is the United States dollar's slump against the Euro. Since oil is traded in dollars, the price must increase for OPEC to maintain purchasing power in Europe.

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