WikiWealth

Oil and petroleum are Saudi Arabia's biggest revenue earners. Demand for petroleum is only increasing as developing countries increase their use of these limited resources.

"Saudi Arabia's economy is petroleum-dependent; roughly 75% of budget revenues and 90% of export earnings come from the oil industry. The oil industry comprises about 45% of Saudi Arabia's gross domestic product, compared with 40% from the private sector (see below). Saudi Arabia officially has about 260 billion barrels (4.1×1010 m3) of oil reserves, comprising about 24% of the world's proven total petroleum reserves.

Recent oil price increases have triggered a second oil boom, pushing Saudi Arabia's budget surplus to $28 billion (110SR billion) in 2005. Tadawul (the Saudi stock market index) finished 2004 with a massive 76.23% to close at 4437.58 points. Market capitalization was up 110.14% from a year earlier to stand at $157.3 billion (589.93SR billion), which makes it the biggest stock market in the Middle East.‏

OPEC limits its members' oil production based on their "proven reserves." The higher their reserves, the more OPEC allows them to produce. Saudi Arabia's published reserves have shown little change since 1980, with the main exception being an increase of about 100 billion barrels (1.6×1010 m3) between 1987 and 1988. Matthew Simmons has suggested that Saudi Arabia is greatly exaggerating its reserves and may soon show production declines (see peak oil). To diversify the economy, Saudi Arabia launched a new city on the western coast with investments exceeding $26.6 billion. The city, which is named "King Abdullah Economic City", will be built near al-Rabegh industrial city north to Jeddah. The new city, where construction work started in December 2005, includes a port which is the largest port of the kingdom. Extending along a coastline of 35 km, the city will also include petrochemical, pharmaceutical, tourism, finance and education and research areas. Saudi Arabia officially became a World Trade Organization member in December 2005.

Saudi Arabia has large supplies of limited resources. This is a tremendous advantage in a world, which relies on petroleum to function."

Source: http://en.wikipedia.org/wiki/Saudi_arabia#Economy