Additional evidence of long-run purchasing power parity with black and official exchange rates

Abstract

In this study, the validity of Purchasing Power Parity (PPP) hypothesis is investigated by using unit root test on official and black market exchange rates for Turkey. When we used the classical unit root test, we found poor evidence for the validity of PPP in classical PP test but no evidence for PPP in the augmented Dickey–Fuller test. However, by using Zivot–Andrews test allowing for one structural break in the series of PPP, we find stronger evidence for both official and black market exchange rates. Our findings illustrate that the unit root test with structural break is powerful than classical ones for long-run PPP.

Notes

¹International capital movements and foreign exchange operations were entirely liberalized, and the TL (Turkish Lira) became convertible in 1989. After 1990, black market lost its power.