Economist: Why the oil price is falling
Finally, the Saudis and their Gulf allies have decided not to sacrifice their own market share to restore the price. They could curb production sharply, but the main benefits would go to countries they detest such as Iran and Russia. Saudi Arabia can tolerate lower oil prices quite easily. It has $900 billion in reserves. Its own oil costs very little (around $5-6 per barrel) to get out of the ground.