On Wed, 30 a rise in sweet crude reached a $4.58 increase. This was not expected rise in fact experts believe that prices would continue to fall because hurricane Dolly did not effect production as much as expected. The reason behind the rise was do to a decrease in supply. For approximately prices for crude had slowing been decreasing allowing the national average for regular to drop below $4.00 a gallon. A problem with dropping gas prices is that when people see $3.65 a gal they become happy and start driving more, which in turn increases the demand, which again increases the price of gas. Gas is an example of an excludable product. People have to pay for the product, no matter what the price. Also when people start to use more of the product there isn’t the same amount for others to use, which in this case makes the price rise.