Goldman Sachs predicts that the price of US gas at the pump will rise  to about $4.35 a gallon by the end of the year, and then reach an  average of $4.40 next year, as supply constraints drive up prices.
 Gas prices have fallen dramatically over the past month or so after  topping $5 a gallon in June as oil prices fell and refineries eased  bottlenecks.  AAA said the average price on Monday was $4.059 a gallon.
 But Goldman said in a note on Sunday that it expects oil prices to  pick up from here after a sharp fall in recent weeks.  This is because  supply is still running low, while global demand remains relatively  strong.
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