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CESifo Working Paper No. 2255; International audience; The aim of this paper is to apply recently developed panel cointegration techniques proposed by Pedroni (1999, 2004) and generalized by Banerjee and Carrion-i-Silvestre (2006) to examine the robustness of the PPP concept for a sample of 80 developed and developing countries. We find that strong PPP is verified for OECD countries and weak PPP for MENA countries. However in African, Asian, Latin American and Central and Eastern European countries, PPP does not seem relevant to characterize the long-run behavior of the real exchange rate. Further investigations indicate that the nature of the exchange rate regime doesn't condition the validity of PPP which is more easily accepted in countries with high than low inflation.

The paper explores the interaction between debt crises and devaluation. Since the optimal level of devaluation in a crisis depends on the level of debt that has to be serviced, a default makes a devaluation less likely. Expected devaluation depends thus on expectations about default which is also a function of the type of policymaker. Therefore, the decision to devalue can be forced upon the government by adverse expectations about default and the type of policymaker in office. I also explore how these uncertainties affect the policymaker's choice of exchange rate regime.