The validity of Purchasing Power Parity (PPP) is re-examined using data for some emerging market economies and African countries, extending recent works of Doğanlar <italic>et al.</italic> (2009) and Chang <italic>et al.</italic> (2010), respectively. For this purpose, we apply new unit root tests that allow for nonlinearities...

In this paper we investigate the real interest parity hypothesis for ten post-Soviet transition countries with respect to Russia, the USA and Germany. For this purpose, we employ conventional linear unit root tests as well as a nonlinear unit root test developed by Kapetanios et al. (2003) to...