How do US sectoral markets connect in calm and crisis? a quantile-based network analysis
Date
2025
Authors
Rehman, M.U.
Zeitun, R.
Nautiyal, N.
Vo, X.V.
Kang, S.H.
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Applied Economics, online, 2025; online(4):1-25
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This work investigates how the return coherence of the US sectoral market changed during/post COVID-19 from the pre-pandemic period. We sampled daily data for a pre-COVID-19 period from January 2018 to November 2019 and a during/post-COVID-19 period from December 2019 to August 2024. To compare the return coherence and spillover for these periods, we applied quantile cross-spectral (Barun & iacute;k & Kley, 2015) and network connectedness (Diebold & Yilmaz, 2014) measures, respectively. Our results highlighted a substantial increase in the integration level of US sectoral returns during/post-COVID-19 period. The effects of COVID-19 on returns were found to be more prominent with a short-run investment horizon under extreme market conditions. However, the coherence of energy sector returns with all other sectors remained low during/post-COVID-19 period under normal and bullish market conditions, thereby offering optimal opportunities for investment.
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Copyright 2025 Informa UK Limited, trading as Taylor & Francis Group