Thay are going to trade with other countries around them because Saudi Arabia is basically all desert, well almost. They have interdpendance with other countries.
Petroleum is the biggest natural resource of Saudi Arabia which has made it so much wealthy and any other resource other than Petroleum is not mentionable.
Oil is largley in the Middle Eastern area including countries like Saudi Arabia. They make much profit by exporting oil to multiple other countries.
Because, the Saudi government controls mostly the natural resources, the rail system, and the post company....etc. Other then that, the government does not own other things in other industries.
The vast majority of Saudi are Wahhabi Muslims. Being any religion other Muslim is illegal in Saudi Arabia.
Saudi Arabia is a wealthy country and has the same tools as any other wealthy country
Nations trade globally due to limited resources. Basically, the same reason as to why we as individuals trade our leisure hours for labor hours, so we can make money and buy our necessities. Similarly, countries trade their resources for other resources that they need. For example, Saudi Arabia has oil that China needs and China has food stuff that Saudi Arabia needs. Limited resources
Saudi Arabia is the largest country on the Arabian Peninsula.
Resources, unfortunately are not balanced between all countries. Some countries, like Saudi Arabia are lucky to have large oil fields. Other countries, like Japan, are almost devoid of minerals and products. Additionally, most Saudi oil is in the northeast, close to Kuwait and Qatar as opposed to being in the southwest where Saudi Arabia borders Yemen.
Saudi Arabia's main trading partners include the US, China, Japan, and South Korea.
Saudi Arabia like other countries, was greatly effected by the Great Depression. Tourism plummeted in Saudi Arabia during the Great Depression and that brought less income into the economy.
Libya, Saudi Arabia, Kuait, any other Arabic nation. The US has abundant oil resources, but Obama won't let the oil companies drill.
Saudi Arabia is producing a lot of oil because it has large oil reserves. Saudi Arabia has one of the largest oil reserves in the world, and producing enough oil to trade to other countries, mainly the US, is very profitable for Saudi Arabia.