First of those would be supply and demand. Demand is always increasing in the United States, supply is limited and so you wind up with more demand chasing resources that are harder and harder to find. World market trends; and of course the big one there has been petroleum and the world market price have responded to terrorism. Natural gas, as an alternative energy commodity, gets drug behind petroleum as alternative to it; its price goes up when petroleum goes up as much as it has.
— Harry Hall
United States