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Full Text: 1 Introduction The Saudi economy has undertaken successive development plans, each of which has been based on crude oil and natural gas production. The national production of oil and gas is sine qua none for the development of the country, and their relative importance is fully recognized since 1981. Although these two contributing nearly 57 percent in the total production of the economy. The production of oil and natural gas declined 44.7 percent in 2013; however the relative importance of manufacturing increased from 4.8% in 1981 to 10.1% in 2013. Saudi Arabia’s economy is still quite outwards-looking in terms of inputs and outputs. The increased imports are playing an important role in the supply of goods and services; is favorable for the economic development of the country. Petroleum exports naturally play an important and influential role in steering the economy, however in recent years, crude oil prices declined from USD110.30/barrel in 2012 to USD58.80/barrel in May 2015. The obligation of Saudi Arabia’s OPEC commitments, oil exports are expected to decrease, inevitably impacting state economy.  Thus it seems imperative to expand its productive base through non oil sector for future development plans and increase relative share in the gross domestic product (GDP). Some studies address economic diversification and its impact on growth and development. Ghanem & Fawaz (1998) address specific allocations of economic and agricultural resources in light of structural changes in factors within the Egyptian economy. That study showed that those structural changes were not substantial, as they acted as catalysts for growth and development; indeed, between 1976 and 1997, those changes worked in favor of Egypt’s least-productive sectors. Hiti (2003) discusses the success of the Gulf Cooperation Council (GCC) in applying economic diversification policies so as to support continuing economic and structural changes, and thus accelerate both the privatization process and the processes of increasing economic cooperation and attracting foreign direct investment. Ling et al. (2005) address the degree of industrial diversity within Taiwan, and its impact on the productivity growth of the electronics industry there. They found that the degree of diversity in the country’s electronics industry is much higher than that estimated for its manufacturing industries. Goran (2013) explains that the diversification process must take into account competitiveness, innovation, and overall development. The oil sector still plays a prominent role in the economies of GCC countries, where between 2005 and 2011 the oil sector contributed about 45.6% of GDP, about 83.9% of the total value of exports, and approximately 84.2% of all government revenues. Mrzuk (2013) studied economic diversification in GCC countries, and found that they have not achieved acceptable diversity levels, relative to other rentier states. Economic diversification can be achieved through the implementation of a package of long-term policies that ensure the gradual transition from a focus on oil to economic diversification. Aayasrh (2014) calculates the industrial diversification coefficient in Jordan. That study showed that there were differences in the degree of industrial diversity among Jordan’s provinces. It recommends encouraging investment in growth-stimulating sectors, and introducing the principle of industrial diversity in the design and planning of long and short-term industrial policy. Finally, Khatib (2014) studied the impact of diversification on growth in the Saudi economy in the 1970–2011period. That study showed that, in spite of increasing the degree of diversification vis-à-vis productive activities, the rate of change in the diversification of imports and exports and in government revenues remained very weak. Additionally, having not achieved the goal of diversifying its productive base—where oil exports account for the bulk of all merchandise exports—government revenues continued to be quite dependent on oil revenues. It is clear that there is a dearth of research on the extent of substantial structural changes in the Saudi economy, and that previous studies have not addressed the means of expanding that country’s productive base in a standardized way. The current study examines the structural changes in the Saudi economy, and how it can expand its productive base; it does so, by undertaking the four objectives viz., (i) Measuring structural changes in the Saudi economy in terms of its economic development plans, (ii) Studying the current state of investment distribution and GDP among various economic sectors, (iii) Estimating the investment multiplier of various economic sectors and (iv) Studying the redirection of fixed investment and its effect on Saudi Arabia’s production base.  2 Materials and Methods The study achieves its econometric analysis objectives by taking two different routes, as explained below. Spearman and Kendall rank correlation coefficients were used to evaluate structural changes in the Saudi economy as successive development plans were made. The Spearman rank correlation coefficient (rs ) was calculated by using the following equation (Bachioua, 2011): rs=1-6 Σdi2÷N(N-1) , Where di2 represents the difference between the two symmetrical ranks, and N represents the number of notes (i.e., subsectors). The significance of the Spearman rank correlation coefficients was also tested, using the t-test as follows: t=rsN-21-rs2. The Kendall rank correlation coefficient (π) was calculated by using the following equation (Kendall, 1955): π=1-4Qnn-1=4Pnn-1-1, P= ΣpiQ= Σ qi Where P represents the number of matching pairs, Q represents the number of nonidentical pairs, pi  represents the numbers successive to R (yi ) that are greater than R (yi ), and qi  represents the number of ranks successive to R (yi ) that are smaller than R (yi ). The significance of the Kendall rank correlation coefficients was also tested, using a distribution (Z) as follows: Z= π÷2(2N+5)9N(N-1).   Table 1 Relative share of various sectors in the Saudi gross domestic product (%),across various economic development plans
Sector Economic development plans First Second Third Fourth Fifth Sixth Seventh Eighth Ninth Agricultural 2.68 1.13 1.70 5.39 5.79 5.70 4.72 2.82 1.98 Crude oil, natural gas, and oil refining 56.98 55.23 46.94 23.52  
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