Is the world about to run out of oil?

Oil importing countries faced an unassailable challenge with the "historic high" price of oil. In 1864, a barrel of Pennsylvanian oil traded for 8.06 in dollars of the day ($97.79 of 2004) and in 1980, a barrel of Arabian light (posted at Ras Tanura) sold for 35.69 in dollars of the day ($82.15 of 2004). The world has not yet faced a "fourth oil shock" mainly because the price went up gradually to over $70 a barrel over a full three-year period, unlike in 1979-80.