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Incorporating daily market uncertainty data into a conventional short-run dynamic model: the case of the black-market exchange rate in Iran

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  • Abbas Valadkhani
  • Jeremy Nguyen
  • Reza Hajargasht

Abstract

The effect of market uncertainty on a country’s currency, while widely recognized, is either omitted from mainstream models or addressed using low-frequency series, which are typically subject to aggregation bias and substantial lags. In this article, we propose a new mixed-data sampling (MIDAS) modelling framework that enables us to incorporate the asymmetric daily effects of market uncertainty in a conventional monthly error correction model. We achieve this by proxying market uncertainty via the value of a ‘safe haven’ asset (gold) that investors reallocate towards in the face of heightened market risk. We apply the model to the Iranian black-market exchange rate, using a mix of the daily price of gold (28 June 2010–19 August 2018) and monthly data (July 2010-July 2018) on relative prices. Our results indicate that purchasing power parity (PPP) holds despite the recent unprecedented depreciations in the Iranian currency arising from several rounds of international sanctions. We also find that increased uncertainty can lead to instantaneous and substantial depreciations, whereas stabilization back towards the PPP path is much more sluggish.

Suggested Citation

  • Abbas Valadkhani & Jeremy Nguyen & Reza Hajargasht, 2019. "Incorporating daily market uncertainty data into a conventional short-run dynamic model: the case of the black-market exchange rate in Iran," Applied Economics, Taylor & Francis Journals, vol. 51(45), pages 4982-4991, September.
    • Handle: RePEc:taf:applec:v:51:y:2019:i:45:p:4982-4991
    DOI: 10.1080/00036846.2019.1607245
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