In recent years, the detrimental effects of bureaucratic corruption gained attention from development economists. Corruption, which was previously ignored and mentioned only with caution, has taken a center stage. Nonetheless, corruption is not a new phenomenon. It is as old as government itself. The current literature on corruption highlights its harmful effects on growth. This paper first investigates corruption roots in some factors such as rules, regulations, concessions, tax, and government expenditure in investment projects, wage level in public section, judicial system, and natural resources. Then, economic growth models of classics; neoclassic, Keynesian and institutionalist are reviewed to identify most important factors on economic growth. In fact, we identified physical, human, and social capital in growth models and focused our attention on indices of social capital including corruption and openness. By these concepts, our simultaneous equations system has been formulated on 106 countries from different levels of development in year 2008. In this system, the openness and government size have been considered as effective factors on economic corruption. We also investigated corruption effects on investment and growth. Our results show that openness and government size have positive effects on corruption reduction, which means, whatever the government size is smaller and economy is more open, the economic corruption is smaller. Finally, we found converse relationship between economic growth rate and corruption. In fact, the reduction of corruption will encourage economic growth.