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Do geopolitical risk, economic policy uncertainty, and oil implied volatility drive assets across quantiles and time-horizons?

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  • Bouri, Elie
  • Gök, Remzi
  • Gemi̇ci̇, Eray
  • Kara, Erkan

Abstract

This paper examines the impact of three global risk factors (geopolitical risk (GPR), economic policy uncertainty (EPU), and crude oil volatility (OVX)) on the returns and variance of commodity, Islamic stock, and green bond markets across quantile distributions and various time horizons. To this end, Granger causality tests in quantiles and distributions along with wavelet-based correlation and causality approaches are applied to daily data from February 1, 2013 to June 30, 2023. The results of the Granger causality in quantiles tests show strong evidence that all three global risk factors Granger-cause returns across all quantiles, except the lowest and middle quantiles. The Granger causality is significant for both returns and variances, where GPR is the least predictor and OVX is the most predictor. Evidence of causation in risk spillovers is in the right tail and center of the distribution rather than the left tail, indicating no evidence of down-to-down risk spillover. The upside risk of OVX causes both the upside and downside risk of asset returns. The positive volatility of EPU and GPR drives the positive and negative volatility of the green bond and Islamic stock markets, respectively. Green bond markets are completely immune to risk spillover from geopolitical risks. The effects of risk factors are negligible at the lower and somewhat middle quantiles but strengthen with varying magnitude and significance for the remaining quantiles. The results of the wavelet analysis indicate that asset returns co-move with the global risk factors in the short term but decouple in the longer term. Risk factors exert short-lived causal impacts in the short term, but the duration of significant causal periods rises with time and the effect intensifies during crisis periods.

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  • Bouri, Elie & Gök, Remzi & Gemi̇ci̇, Eray & Kara, Erkan, 2024. "Do geopolitical risk, economic policy uncertainty, and oil implied volatility drive assets across quantiles and time-horizons?," The Quarterly Review of Economics and Finance, Elsevier, vol. 93(C), pages 137-154.
    • Handle: RePEc:eee:quaeco:v:93:y:2024:i:c:p:137-154
    DOI: 10.1016/j.qref.2023.12.004
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