## Appendix C  
Finally, Table A3 shows the ARIMA models used as a benchmark for each country. In order to use these kinds of models with forecasting purposes, we have designed an algorithm that identifies that best suited model during the in-sample period. This automatic procedure selects the model by combining unit root tests and the minimization of the Akaike's information criterion (AIC). In order to traverse the space of models efficiently,  
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