It costs more than $50 to extract from the sea per barrel, oil prices are going to be at that, ie, it's not viable if OPEC decide it isn't. Maybe Obama just save a load of people a load of money.
No. The potential for supply enhancement in and of itself impacts prices immediately.
The potential for supply restriction does the same in the reverse direction. The costs of extraction, getting product to market, etc., is just weeds.
Yes, supply can impact demand, we've seen a massive rise in prices because China has developed massively in the last 14 years, and wants oil. However if you can't make money from extracting oil, why would you do it? Also if your company moves into a position where you think you might lose money, your share prices will go down, the viability of your business is at major risk, and if you actually start losing money, then you will go bankrupt. It's quite simple.
If OPEC push the price below what it costs, then what happens?