Article2007

Does PPP hold for Big Mac price or consumer price index? Evidence from panel cointegration

Chien-Fu Chen · Chung‐Hua Shen · Chien-an Andy Wang

22 citations0/0 files storedRePEc: Research Papers in Economics

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Abstract

This paper examines the validity of purchasing power parity (PPP) using CPI and Big Mac prices. The benchmark model, i.e., the OLS method, which does not take nonstationarity into account, rejects the hypothesis of PPP regardless of prices used. We next use the panel cointegration method to consider the nonstationary nature of variables. Estimated results for CPI are mixed. The PPP is rejected when the nominal exchange rate is employed as the dependent variable but is not rejected when the price ratio is used as the dependent variable. By contrast, the PPP is overwhelmingly not rejected when the Big Mac price is used. Last, we remove the production bias and re-examine the same issue by using panel cointegration. The PPP is again decisively rejected when CPI price is used but not for Big Mac price. Accordingly, Big Mac price is more supportive to the validity of PPP than CPI price. We are grateful to Professor Peter Pedroni for providing RATS code to implement panel cointegration tests.

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References

1987Co-Integration and Error Correction: Representation, Estimation, and Testing 1988Testing for a Unit Root in Time Series Regression 2003Testing for unit roots in heterogeneous panels 1990MAXIMUM LIKELIHOOD ESTIMATION AND INFERENCE ON COINTEGRATION — WITH APPLICATIONS TO THE DEMAND FOR MONEY 2002Unit root tests in panel data: asymptotic and finite-sample properties 2004PANEL COINTEGRATION: ASYMPTOTIC AND FINITE SAMPLE PROPERTIES OF POOLED TIME SERIES TESTS WITH AN APPLICATION TO THE PPP HYPOTHESIS 1999Critical Values for Cointegration Tests in Heterogeneous Panels with Multiple Regressors 1964The Purchasing-Power Parity Doctrine: A Reappraisal

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