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Source: CNN Money. Exxon is the second largest company in the US as far as revenues go. However, its revenues have dropped by more than 7 percent from the previous year along with decreased oil production and increasing exploration expenditures.
Saudi Arabia is by far the biggest producer in the OPEC club and the opinion of its oil minister, pretty much rules the actions of OPEC. If OPEC members decide to cut their production, but Saudi Arabia refuses to play ball, the resolution to cut would have no impact on oil prices, and thus be a worthless exercise.