Why the oil price is dropping?

I mean, it surged right after the election, but it's now dropping again. And it is said that it's all Saudi Arabia's scheme against Iran.

Oil traders and others believe that the Saudi decision to let the price of oil tumble has more to do with Iran than economics.

Their belief has been reinforced in recent days as the Saudi oil minister has steadfastly refused calls for a special meeting of OPEC and announced that the nation is going to increase its production, which will send the price down even farther.

The trader notes that Iran, OPEC’s second largest producer, is “in trouble” both in the short and long term. Iran’s oil reserves, he notes, are declining more rapidly than Saudi Arabia’s and are more difficult to extract. While a barrel of oil costs the Saudis $2-3 to get out of the ground and to market, that same barrel costs Iran as much as $15-18.

There are domestic political consequences to such a convergence, note traders and officials in both the U.S. and Iran. Ahmadinejad was elected on campaign promises that he would end corruption and better distribute the nation’s oil wealth. He has been unable to do either; now, with declining oil revenues, his job will be even more difficult.