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Has US (Un)Conventional Monetary Policy Affected South African Financial Markets in the Aftermath of COVID-19? A Quantile–Frequency Connectedness Approach

Author

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  • Mashilana Ngondo

    (Department of Economics, Faculty of Business and Economic Sciences, Nelson Mandela University, Port Elizabeth 6031, South Africa)

  • Andrew Phiri

    (Department of Economics, Faculty of Business and Economic Sciences, Nelson Mandela University, Port Elizabeth 6031, South Africa)

Abstract

The US has undertaken both unconventional and conventional monetary policy stances in response to the COVID-19 pandemic and the Ukraine–Russia conflict, and there has been much debate on the effects of these various monetary policies on global financial markets. Our study considers the debate in the context of South Africa and uses the quantile–frequency connectedness approach to examine static and dynamic systemic spillover between the US shadow short rate (SSR) and South African equity, bond and currency markets between 1 December 2019 and 2 March 2023. The findings from the static analysis reveal that systemic connectedness is concentrated at their tail-end quantile distributions and US monetary policy plays a dominant role in transmitting these systemic shocks, albeit these shocks are mainly high frequency with very short cycles. However, the dynamic estimates further reveal that US monetary policy exerts longer-lasting spillover shocks to South African financial markets during periods corresponding to FOMC announcements of quantitative ‘easing’ or ‘tapering’ policies. Overall, these findings are useful for evaluating the effectiveness of the Reserve Bank’s macroprudential policies in ensuring market efficiency, as well as for enhancing investor decisions, portfolio allocation and risk management.

Suggested Citation

  • Mashilana Ngondo & Andrew Phiri, 2025. "Has US (Un)Conventional Monetary Policy Affected South African Financial Markets in the Aftermath of COVID-19? A Quantile–Frequency Connectedness Approach," IJFS, MDPI, vol. 13(3), pages 1-25, August.
    • Handle: RePEc:gam:jijfss:v:13:y:2025:i:3:p:153-:d:1730853
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    References listed on IDEAS

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    1. Diebold, Francis X. & Yilmaz, Kamil, 2012. "Better to give than to receive: Predictive directional measurement of volatility spillovers," International Journal of Forecasting, Elsevier, vol. 28(1), pages 57-66.
    2. Francis X. Diebold & Kamil Yilmaz, 2009. "Measuring Financial Asset Return and Volatility Spillovers, with Application to Global Equity Markets," Economic Journal, Royal Economic Society, vol. 119(534), pages 158-171, January.
    3. De Rezende, Rafael B. & Ristiniemi, Annukka, 2023. "A shadow rate without a lower bound constraint," Journal of Banking & Finance, Elsevier, vol. 146(C).
    4. Joshua Aizenman & Mahir Binici & Michael M. Hutchison, 2016. "The Transmission of Federal Reserve Tapering News to Emerging Financial Markets," International Journal of Central Banking, International Journal of Central Banking, vol. 12(2), pages 317-356, June.
    5. Duc Hong Vo & Tam Hoang‐Nhat Dang, 2024. "The geopolitical risk spillovers across BRICS countries: A quantile frequency connectedness approach," Scottish Journal of Political Economy, Scottish Economic Society, vol. 71(1), pages 132-143, February.
    6. Andrew Phiri, 2015. "Asymmetric cointegration and causality effects between financial development and economic growth in South Africa," Studies in Economics and Finance, Emerald Group Publishing Limited, vol. 32(4), pages 464-484, October.
    7. Gonzalo Huertas, 2022. "Why Follow the Fed? Monetary Policy in Times of US Tightening," IMF Working Papers 2022/243, International Monetary Fund.
    8. Gemma B. Estrada & Donghyun Park & Arief Ramayandi, 2016. "Taper Tantrum and Emerging Equity Market Slumps," Emerging Markets Finance and Trade, Taylor & Francis Journals, vol. 52(5), pages 1060-1071, May.
    9. Iyke, Bernard Njindan & Ho, Sin-Yu, 2021. "Exchange rate exposure in the South African stock market before and during the COVID-19 pandemic," Finance Research Letters, Elsevier, vol. 43(C).
    10. repec:eme:sef000:sef-01-2014-0009 is not listed on IDEAS
    11. Francis X. Diebold & Kamil Yilmaz, 2022. "On the Past, Present, and Future of the Diebold-Yilmaz Approach to Dynamic Network Connectedness," Koç University-TUSIAD Economic Research Forum Working Papers 2207, Koc University-TUSIAD Economic Research Forum.
    12. Thando Mkhombo & Andrew Phiri, 2022. "Investigating Fisher effect in SACU countries: A wavelet coherence approach," Cogent Economics & Finance, Taylor & Francis Journals, vol. 10(1), pages 2142308-214, December.
    13. Andrew Phiri, 2015. "Asymmetric cointegration and causality effects between financial development and economic growth in South Africa," Studies in Economics and Finance, Emerald Group Publishing Limited, vol. 32(4), pages 464-484, October.
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