As an illustration, Saudi Arabia is one of the countries that has an extremely high population and socio-economic level, but unemployment still exists for a hundred years due to fewer people opportunities to get sophisticated jobs. Oil has become an important factor in Saudi Arabia and Saudis, who have higher education in the oil sector, are more likely to be hired for jobs. The situation of oil industries in Saudi Arabia is evidently vigorous due to the developments of industrial civilization in Saudi Arabia. Therefore, the function of oil has contributed to the development of several countries in the world. Regardless of the country's old geographical boundaries, the country having no oil during the 1800s was a struggle for the country itself due to the high population like Egypt. The population was extremely high in Egypt and especially in 1950. At that time, the population in Egypt was close to doubling, reaching 10 million, and the population continued to increase to 83 in 2011. Furthermore, the high density of population leads to creating unemployment in Egyptian societies and exaggeration of the population number can lead to this