Diffusion of COVID-19 impact across selected stock markets: a wavelet coherency analysis

  • Received August 29, 2020;
    Accepted November 20, 2020;
    Published December 3, 2020
  • Author(s)
  • DOI
  • Article Info
    Volume 17 2020, Issue #4, pp. 202-214
  • Cited by
    8 articles

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This work is licensed under a Creative Commons Attribution 4.0 International License

COVID-19 has impacted the world economy in an unprecedented manner; the financial markets indicate the same. This spontaneous event landed most of the stock markets into extreme volatility. Large capital outflow and extreme rapid fall were seen among almost all the world financial markets. Though similar trend prevailed everywhere during this pandemic, the impact could not be accumulated in absolute terms. Using the data of five stock markets, the current study endeavored to draw an impact of COVID-19 on major stock exchanges. The study uses wavelet coherency analysis on one-year daily data from June 2019 to May 2020 of five stock markets: Bombay Stock Exchange (BSE), London Stock Exchange (LSE), NASDAQ, Tokyo Stock Exchange (Nikkei), and Shanghai Stock Exchange. It is observed that there are time-variation and scale-variation in co-movements between the studied markets. During the crisis, the co-movement concentrates on a short time scale, even for two days. These results have significant implications for international investors, which will help them in portfolio diversification with time elements. All the stock markets under study have indicated co-movement at different time scales and frequencies with varying cross-power levels. However, the concentration of co-movement is found the most between the UK and the US stock markets. It is the least between Japan and the UK. In BSE, co-movement at shorter time scales started late. NASDAQ is leading only in one case, i.e., Shanghai Stock Exchange. BSE is not leading any stock index. LSE is in the leading position in all four cases. It has also been observed that co-movement started to concentrate at a shorter time scale as soon as the impact of the crisis increased.

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    • Figure 1. London Stock Exchange and Tokyo Stock Exchange (Nikkei)
    • Figure 2. London Stock Exchange and NASDAQ
    • Figure 3. Shanghai Stock Exchange and BSE
    • Figure 4. Shanghai Stock Exchange and NASDAQ
    • Figure 5. NASDAQ and BSE
    • Figure 6. London Stock Exchange and BSE
    • Figure 7. Shanghai Stock Exchange and Tokyo Stock Exchange (Nikkei)
    • Figure 8. Shanghai Stock Exchange and London Stock Exchange
    • Figure 9. NASDAQ and Tokyo Stock Exchange (Nikkei)
    • Figure 10. Tokyo Stock Exchange (Nikkei) and BSE
    • Conceptualization
      Taufeeque Ahmad Siddiqui, Mohammad Naushad
    • Data curation
      Taufeeque Ahmad Siddiqui
    • Methodology
      Taufeeque Ahmad Siddiqui
    • Project administration
      Taufeeque Ahmad Siddiqui
    • Supervision
      Taufeeque Ahmad Siddiqui, Mohammad Naushad
    • Formal Analysis
      Haseen Ahmed
    • Validation
      Haseen Ahmed
    • Visualization
      Haseen Ahmed
    • Writing – original draft
      Haseen Ahmed
    • Investigation
      Mohammad Naushad
    • Resources
      Mohammad Naushad
    • Writing – review & editing
      Mohammad Naushad