Research Article

INVESTIGATING THE VALIDITY OF THE PURCHASING POWER PARITY HYPOTHESIS: THE CASE OF TÜRKİYE

Volume: 27 Number: 1 January 26, 2026
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INVESTIGATING THE VALIDITY OF THE PURCHASING POWER PARITY HYPOTHESIS: THE CASE OF TÜRKİYE

Abstract

This study aims to test the validity of the Purchasing Power Parity (PPP) hypothesis for Türkiye using monthly data for the period February 2001-July 2024. To this end, the Augmented Dickey-Fuller (ADF) test, a conventional unit root test, and the Fractional Frequency Fourier ADF (FFFADF) test, which can take into account multiple nonlinear structural breaks, are applied. In the analysis, CPI- and D-PPI-based Real Effective Exchange Rates (REERs) as well as CPI-adjusted REER variables for developing and developed countries are analyzed separately. The ADF unit root tests do not provide consistent results on the validity of the PPP hypothesis in Türkiye in the relevant period. Since the ADF test ignores structural breaks, the FFFADF unit root test, which is a more advanced technique, is used to test the validity of the PPP hypothesis with stronger evidence. The FFFADF unit root test results reveal that the PPP hypothesis is valid only for the CPI-based and CPI developed countries-based REER definitions in Türkiye during the analyzed period. This finding implies that the applicability of PPP is highly conditional on the price index and trading partner group used. This concrete and most important impact for the Turkish economy is that the long-run stabilizing feature of the REER supports the effectiveness of the Inflation Targeting Regime, allowing the Central Bank to focus on other policy instruments in the fight against inflation.

Keywords

References

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Details

Primary Language

English

Subjects

Applied Macroeconometrics

Journal Section

Research Article

Publication Date

January 26, 2026

Submission Date

July 23, 2025

Acceptance Date

November 26, 2025

Published in Issue

Year 2026 Volume: 27 Number: 1

APA
Yağmur, İ. (2026). INVESTIGATING THE VALIDITY OF THE PURCHASING POWER PARITY HYPOTHESIS: THE CASE OF TÜRKİYE. Cumhuriyet Üniversitesi İktisadi Ve İdari Bilimler Dergisi, 27(1), 38-53. https://doi.org/10.37880/cumuiibf.1749539

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