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This study aims to identify key sectors in countries showing any class change in level of income and to examine whether there is any relationship between sectors and income classes. Another aim of the study is to identify emerging and disappearing sectors in key sectors during periods when countries’ income levels change. In this context, four basic income classes published by the World Bank are examined for 43 countries but class change was identified only in 12 countries between 2000-2014. A statistical difference was determined between the sectors in the classes at Low and Low Middle levels and Upper Middle and High) classes. Among these countries discussed in the 15-year period with 56 sectors examined, some sectors showed feature of being common key sectors, some tendency to be a key sector in recent years and some sectors have lost their key feature before or after the direct income class changes.

Do the Key Sectors Depend on Changing the Income Level of Countries?