Abstract
This paper investigates the behavior of the inflation rate in Iran for the time period 1992–2017 using fractional integration. The results indicate an extremely large degree of persistence in the series, with an order of integration of about 2. The consequences of such a degree of dependence are examined in the paper along with some suggestions to reduce it in the future.
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Notes
An I(0) process is defined in the paper as a covariance stationary process where the infinite sum of the autocovariances is finite. It includes thus the white noise case but also stationary ARMA structures.
The choice of the optimal bandwidth number is still an unresolved issue in most semiparametric estimation methods with fractional integration. It indicates the trade-off between bias and variance.
Based of on the nonstationary nature of the data, the estimates were based on the second differenced data, adding then the value 2 to the estimated values.
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Acknowledgements
Prof. Luis A. Gil-Alana gratefully acknowledges financial support from the Ministerio de Economía y Competitividad (ECO2017–55236). Comments from the Editor and an anonymous reviewer is gratefully acknowledged.
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Gil-Alana, L.A., Dadgar, Y. & Nazari, R. Iranian inflation: peristence and structural breaks. J Econ Finan 43, 398–408 (2019). https://doi.org/10.1007/s12197-018-9446-x
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DOI: https://doi.org/10.1007/s12197-018-9446-x