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Purchasing Power Parity has been one of the most popular topics in international economy and has been studied by many researchers for different countries and country groups to date. The purpose of this study is to analyze the validity of the Purchasing Power Parity in emerging seven countries (E7) using relevant econometric methods. The Harvey and Leybourne ( 2007) and Harvey et al. (2008) linearity tests have been used to investigate the linearity of real exchange rate series. The validity of the Purchasing Power Parity was analyzed using the Lee and Strazicich ( 2003) unit root test that allows for two structural breaks for linear series. The Purchasing Power Parity for nonlinear series was analyzed using the Sollis ( 2009) nonlinear unit root test. As a result of the analysis, purchasing power parity is valid only for the model that allows for breaks in both the level and trend in Brazil and India for linear series. Purchasing power parity is valid only in the demeaned model for China. The findings indicate that the validity of the Purchasing Power Parity is not accepted for E7 countries in many cases.

It is observed that purchasing power parity (PPP) as one of the controversial and most interesting topics of international macroeconomics literature is tested by using different econometric methods for certain countries and/or country groups by many researchers. The validity of PPP is important in terms of being a common exchange rate used in international comparison. In this context, the validity of relative purchasing power parities in the BRICS countries (Brazil, Russia, India, China and South Africa) were analysed for the January 1993-March 2015 period. Non-linear stationarity analysis was used in the study. According to the findings of the analysis, it was concluded that all of the BRICS countries have a non-linear structure; the PPP approach was valid for Brazil and South Africa, but not valid for Russia, India and China in the relevant period.

Özİktisat literatürünün yeni ve ilgi çeken konularından biri orta gelir tuzağıdır. Orta gelir tuzağı, genel olarak orta gelirli ülkelerin yavaş büyüme performansı sergileyerek belirli gelir seviyesinde sıkışması ve yüksek gelir grubuna geçememesi olarak tanımlanabilir. Bu çalışmanın amacı, gelişmekte olan ülkeler arasında önemli yere sahip E7 (Gelişen 7) ülkelerinin orta gelir tuzağında olup olmadığını araştırmaktır. Bu kapsamda Robertson ve Ye (2013) yaklaşımı dikkate alınmıştır. Ampirik analizler tek ve iki yapısal kırılmalı birim kök testleri kullanılarak yapılmıştır. Yapılan analizler sonucunda E7 ülke grubunu oluşturan ülkelerden Endonezya, Meksika ve Rusya'nın orta gelir tuzağında olduğu yönünde kanıtlara ulaşılmıştır. Brezilya, Çin, Hindistan ve Türkiye'nin ise genel olarak orta gelir tuzağında olmadığı bulgularına ulaşılmıştır.

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