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COVID-19 and financial market efficiency: Evidence from an entropy-based analysis

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  1. Assaf, Ata & Bhandari, Avishek & Charif, Husni & Demir, Ender, 2022. "Multivariate long memory structure in the cryptocurrency market: The impact of COVID-19," International Review of Financial Analysis, Elsevier, vol. 82(C).
  2. Kakinaka, Shinji & Umeno, Ken, 2022. "Cryptocurrency market efficiency in short- and long-term horizons during COVID-19: An asymmetric multifractal analysis approach," Finance Research Letters, Elsevier, vol. 46(PA).
  3. Andrew Phiri, 2022. "Changing efficiency of BRICS currency markets during the COVID-19 pandemic," Economic Change and Restructuring, Springer, vol. 55(3), pages 1673-1699, August.
  4. Duan, Kun & Zhang, Liya & Urquhart, Andrew & Yao, Kai & Peng, Long, 2024. "Do clean and dirty cryptocurrencies connect financial assets differently? The perspective of market inefficiency," Research in International Business and Finance, Elsevier, vol. 70(PB).
  5. Atipaga, Umar-Farouk & Alagidede, Imhotep & Tweneboah, George, 2025. "Information flow between stock returns of advanced markets and emerging African economies," Research in International Business and Finance, Elsevier, vol. 73(PA).
  6. Ayhan Kuloğlu, 2021. "Covıd-19 Krizinin Petrol Fiyatları Üzerine Etkisi," Journal of Research in Economics, Politics & Finance, Ersan ERSOY, vol. 6(3), pages 710-727.
  7. Jacek Karasinski, 2022. "The Impact of the COVID-19 Outbreak on the Weak-Form Informational Efficiency of the Warsaw Stock Exchange (Wplyw wybuchu epidemii COVID-19 na efektywnosc informacyjna Gieldy Papierow Wartosciowych w ," Research Reports, University of Warsaw, Faculty of Management, vol. 2(37), pages 15-28.
  8. Bolek Monika & Gniadkowska-Szymańska Agata & Lyroudi Katerina, 2022. "Covid-19 Pandemic and Day-of-the-week Anomaly in Omx Markets," Central European Economic Journal, Sciendo, vol. 9(56), pages 158-177, January.
  9. Katsiampa, Paraskevi & Yarovaya, Larisa & Zięba, Damian, 2022. "High-frequency connectedness between Bitcoin and other top-traded crypto assets during the COVID-19 crisis," Journal of International Financial Markets, Institutions and Money, Elsevier, vol. 79(C).
  10. Salim Lahmiri, 2025. "Wavelet Entropy for Efficiency Assessment of Price, Return, and Volatility of Brent and WTI During Extreme Events," Commodities, MDPI, vol. 4(2), pages 1-10, March.
  11. Kumari, Vineeta & Kumar, Gaurav & Pandey, Dharen Kumar, 2023. "Are the European Union stock markets vulnerable to the Russia–Ukraine war?," Journal of Behavioral and Experimental Finance, Elsevier, vol. 37(C).
  12. Chen, Yanan & Qi, Haozhi, 2024. "COVID-19 pandemic-related news and Chinese commodities futures: Time-frequency connectedness and causality-in-quantiles approaches," Energy, Elsevier, vol. 286(C).
  13. Faheem Aslam & Paulo Ferreira & Haider Ali, 2022. "Analysis of the Impact of COVID-19 Pandemic on the Intraday Efficiency of Agricultural Futures Markets," JRFM, MDPI, vol. 15(12), pages 1-18, December.
  14. Radhika Prosad Datta, 2023. "Regularity in forex returns during financial distress: Evidence from India," Papers 2308.04181, arXiv.org.
  15. Wang, Mei-Chih & Chang, Hao-Wen & Chang, Tsangyao, 2025. "Impact of COVID-19 on Taiwanese stock market," The North American Journal of Economics and Finance, Elsevier, vol. 75(PA).
  16. Clement Moyo & Izunna Anyikwa & Andrew Phiri, 2023. "The Impact of Covid-19 on Oil Market Returns: Has Market Efficiency Being Violated?," International Journal of Energy Economics and Policy, Econjournals, vol. 13(1), pages 118-127, January.
  17. Boubaker, Sabri & Goodell, John W. & Pandey, Dharen Kumar & Kumari, Vineeta, 2022. "Heterogeneous impacts of wars on global equity markets: Evidence from the invasion of Ukraine," Finance Research Letters, Elsevier, vol. 48(C).
  18. Muhammad Anas & Syed Jawad Hussain Shahzad & Larisa Yarovaya, 2024. "The use of high-frequency data in cryptocurrency research: a meta-review of literature with bibliometric analysis," Financial Innovation, Springer;Southwestern University of Finance and Economics, vol. 10(1), pages 1-31, December.
  19. Yang, Jinjuan & Lu, Yongyu & Zong, Wen, 2025. "How industry concentration changes affect productive and non-productive entrepreneurship," Finance Research Letters, Elsevier, vol. 72(C).
  20. Skwarek Mateusz, 2023. "Is Bitcoin an emerging market? A market efficiency perspective," Central European Economic Journal, Sciendo, vol. 10(57), pages 219-236, January.
  21. Assaf, Ata & Mokni, Khaled & Yousaf, Imran & Bhandari, Avishek, 2023. "Long memory in the high frequency cryptocurrency markets using fractal connectivity analysis: The impact of COVID-19," Research in International Business and Finance, Elsevier, vol. 64(C).
  22. Raza, Syed Ali & Shah, Nida & Guesmi, Khaled & Msolli, Badreddine, 2022. "How does COVID-19 influence dynamic spillover connectedness between cryptocurrencies? Evidence from non-parametric causality-in-quantiles techniques," Finance Research Letters, Elsevier, vol. 47(PA).
  23. Tetsuya Takaishi, 2025. "Impact of the COVID-19 Pandemic on the Financial Market Efficiency of Price Returns, Absolute Returns, and Volatility Increment: Evidence from Stock and Cryptocurrency Markets," JRFM, MDPI, vol. 18(5), pages 1-16, April.
  24. Omoniyi, Oluwabusayo Samuel & Akintoye, Rufus Ishola, 2024. "Covid-19 and Sustainable Performance in Nigeria Listed Industrial Goods Firms," International Journal of Research and Innovation in Social Science, International Journal of Research and Innovation in Social Science (IJRISS), vol. 8(7), pages 1306-1316, July.
  25. Long, Shaobo & Zhang, Rui & Hao, Jing, 2022. "Asymmetric impact of Sino-US interest rate differentials and economic policy uncertainty ratio on RMB exchange rate," Journal of International Financial Markets, Institutions and Money, Elsevier, vol. 78(C).
  26. Montasser, Ghassen El & Charfeddine, Lanouar & Benhamed, Adel, 2022. "COVID-19, cryptocurrencies bubbles and digital market efficiency: sensitivity and similarity analysis," Finance Research Letters, Elsevier, vol. 46(PA).
  27. Lee, Min-Jae & Choi, Sun-Yong, 2024. "Insights into the dynamics of market efficiency spillover of financial assets in different equity markets," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 641(C).
  28. Apergis, Nicholas, 2022. "COVID-19 and cryptocurrency volatility: Evidence from asymmetric modelling," Finance Research Letters, Elsevier, vol. 47(PA).
  29. Karamti, Chiraz & Jeribi, Ahmed, 2023. "Stock markets from COVID-19 to the Russia–Ukraine crisis: Structural breaks in interactive effects panels," The Journal of Economic Asymmetries, Elsevier, vol. 28(C).
  30. Shimeng Shi & Jia Zhai & Yingying Wu, 2024. "Informational inefficiency on bitcoin futures," The European Journal of Finance, Taylor & Francis Journals, vol. 30(6), pages 642-667, April.
  31. Deev, Oleg & Plíhal, Tomáš, 2022. "How to calm down the markets? The effects of COVID-19 economic policy responses on financial market uncertainty," Research in International Business and Finance, Elsevier, vol. 60(C).
  32. Kunal Saha & Vinodh Madhavan & G. R. Chandrashekhar, 2022. "Effect of COVID-19 on ETF and index efficiency: evidence from an entropy-based analysis," Journal of Economics and Finance, Springer;Academy of Economics and Finance, vol. 46(2), pages 347-359, April.
  33. Roy, Archi & Soni, Anchal & Deb, Soudeep, 2023. "A wavelet-based methodology to compare the impact of pandemic versus Russia–Ukraine conflict on crude oil sector and its interconnectedness with other energy and non-energy markets," Energy Economics, Elsevier, vol. 124(C).
  34. Yan, Huanmin & Liu, Zhenyu & Wang, Haoyu & Zhang, Xuehua & Zheng, Xilei, 2022. "How does the COVID-19 affect earnings management: Empirical evidence from China," Research in International Business and Finance, Elsevier, vol. 63(C).
  35. Hong, Yun & Jiang, Yanhui & Su, Xiaojian & Deng, Chao, 2024. "Extreme state media reporting and the extreme stock market during COVID-19: A multi-quantile VaR Granger causality approach in China," Research in International Business and Finance, Elsevier, vol. 67(PA).
  36. Bouteska, Ahmed & Harasheh, Murad & Abedin, Mohammad Zoynul, 2023. "Revisiting overconfidence in investment decision-making: Further evidence from the U.S. market," Research in International Business and Finance, Elsevier, vol. 66(C).
  37. Wang, Xiaoyang, 2022. "Efficient markets are more connected: An entropy-based analysis of the energy, industrial metal and financial markets," Energy Economics, Elsevier, vol. 111(C).
  38. Tetsuya Takaishi, 2025. "Impact of the COVID-19 pandemic on the financial market efficiency of price returns, absolute returns, and volatility increment: Evidence from stock and cryptocurrency markets," Papers 2504.18960, arXiv.org.
  39. Ştefan Cristian Gherghina & Liliana Nicoleta Simionescu, 2023. "Exploring the asymmetric effect of COVID-19 pandemic news on the cryptocurrency market: evidence from nonlinear autoregressive distributed lag approach and frequency domain causality," Financial Innovation, Springer;Southwestern University of Finance and Economics, vol. 9(1), pages 1-58, December.
  40. Esparcia, Carlos & López, Raquel, 2024. "Performance of crypto-Forex portfolios based on intraday data," Research in International Business and Finance, Elsevier, vol. 69(C).
  41. Sihyun An & Jihae Kim & Gahyun Choi & Hanwool Jang & Kwangwon Ahn, 2024. "The effect of rare events on information-leading role: evidence from real estate investment trusts and overall stock markets," Palgrave Communications, Palgrave Macmillan, vol. 11(1), pages 1-10, December.
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