Rentier economies lead to dictatorships.  Most economies in the middle east are oligarchic with the wealth in the hands of a few. Oil has created rentier economies. These economies rely upon systems of patronage relying upon kinship groups, merchant communities and patron-client relationships, economic considerations become subservient to political considerations. [1] This occurred because of the small size of Middle Eastern private sectors forced the creation of state centred development programs. [2] While it remains the case there is a very small group of people in each Arab country that need to keep political power in order to perpetuate their economic power. As they already have the economic power and are often the best educated they are the most capable of forming any new government. In such an oligarchic society it would be very risky for these people to allow the creation of a democracy that may well wish to redistribute resources more equally.  [1] Michel Chatelus and Yves Scehmeil, ‘Towards a New Political Economy of State Industrialisation in the Arab Middle East’, International Journal of Middle East Studies, Vol. 16, No. 2 (May, 1984), pp.251-265, pp.261-262  [2] Timur Kuran, ‘Why the Middle East is Economically Underdeveloped: Historical Mechanisms of Institutional Stagnation’, The Journal of Economic Perspectives, Vol.18, No.3 (Summer, 2004), pp.71-90, p.87.