Iran has one of the largest economies in the Middle East. It is the world's 18th largest by PPP. Iran's major industries are largely state owned. The nature of the Iranian state-owned enterprises has led to a degree of inefficiency. Iran ranks 69th out of 139 in Global Competitiveness Report. Iran has been able to subsidize inefficient industry through large oil revenues and maintain respectable growth rates. The nature of the state-driven economy has led to significant 'brain drain' in recent years as educated Iranians seek opportunities abroad. Consequently, Iran has begun a privatization effort in order to stimulate trade in accordance with its ongoing five-year plan and has also undertaken an ambitious economic reform plan.