The banking sector as the absorber of the COVID-19 crisis? economic consequences: perception of WSE investors




banking sector, commercial banks, Warsaw Stock Exchange, COVID-19


Research background: The paper focuses on the research of investors? decisions with regard to shares of all 12 banks listed on the Warsaw Stock Exchange during the first half of 2020. It examines the behavior of a subindex reflecting bank shares? prices against the main WIG index WIG and 14 sector subindices. The authors identify groups of banks with different investors? responses. They also classify banks into separate groups on the basis of changes in the fundamental indicators describing their economic and financial performance. The study concentrates mainly on the verification of the stability of this attribution, explaining reasons for its modifications over time.   

Purpose of the article: To identify the characteristics of bank clusters determining different capital market responses to their listed shares and to explain the reasons for volatility in investors? behavior within the analyzed period.

Methods: The methodology of the research can be described in three areas. The first is the statistical analysis with the emphasis on the use of a quarter range to capture changes in the volatility of share prices. The second area is the clustering k-means method based on the interpolated ? from quarterly to daily ? measures of the bank?s financial condition. This mathematical approach is a novelty in finance and economics. The last, third, area is forecasting with the use of linear regression analysis, which is the key factor in determining the abnormal rates of return. The indicated areas are combined through a generally understood correlation analysis.

Findings & value added: Large retail banks have been less affected compared to medium-sized ones with relatively rich corporate portfolios. The initial market reaction reflected concern about the resistance to the crisis of poorly capitalized banks with mean liquidity buffers. Upon the announcement of government support, investors? approach to the shares of banks of differentiated economic and financial performance conformed accordingly. These findings are valuable in the long term especially from the perspective of supervision authorities? policy during external shocks. The presented study suggests designing flexible and tailor-made regulatory approach aligned with the defined bank clusters. Its value added also consists in proposing a new method of analysis, combining interpolation and automatic clustering, which has proved to be adequate for the study of a bank?s financial condition based on daily frequency data. Furthermore, assuming the same length of the estimation window, a close relationship is shown between the results of clustering and the forecasts based on different measures of rates of return.


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Acharya, V. V., & Steffen, S. (2020). The risk of being a fallen angel and the corporate dash for cash in the midst of COVID. Review of Corporate Finance Studies, 9(3), 430?471, doi: 10.1093/rcfs/cfaa013.

Acharya, V., Engle, R., & Steffen, S. (2020). What explains the crash of bank stock prices during COVID-19? The role of health, financial and oil price risks. Working Paper, NYU Stern School of Business. Retrieved from (22.11.2020).

Albuquerque, R. A., Koskinen, Y., Yang, S., & Zhang, C. (2020). Resiliency of environmental and social stocks: an analysis of the exogenous COVID-19 market crash. European Corporate Governance Institute ? Finance Working Paper, 676. doi: 10.2139/ssrn.3583611.

Alfaro, L., Chari, A., Greenland, A., & Schott, P. K. (2020). Aggregate and firm-level stock returns during pandemics in real time. NBER Working Papers, 26950. doi: 10.3386/w26950.

Altavilla, C., Boucinha, M., & Peydró, J. L. (2017). Monetary policy and bank profitability in a low interest rate environment. European Central Bank, Working Paper Series, 2105.

Altman, E. (2020). The credit cycle before and after the market?s awareness of the coronavirus crisis in the U.S. Working Paper. NYU Stern School of Business. doi: 10.2139/ssrn.3604361.

Arteaga-Garavito, M. J., Croce, M. M., Farroni, P., & Wolfskeil, I. (2020). When the markets get CO.V.I.D.: contagion, viruses, and information diffusion. CEPR Discussion Papers, 14674. doi: 10.2139/ssrn.3560347.

Baker, S. R., Bloom, N., Davis, S. J., & Stephen, J. T. (2020). COVID-induced economic uncertainty. NBER Working Papers, 26983. doi: 10.3386/w26983.

Barber, B. M., & Lyon, J. D. (1997). Detecting long-run abnormal stock returns: the empirical power and specification of test statistics. Journal of Financial Economics, 43(3), 341?372. doi: 10.1016/S0304-405X(96)00890-2.

Baret, S., Celner, A., O?Reilly, M., & Shilling, M. (2020). COVID-19 potential implications for the banking and capital market sector: business and operational resilience. Maintaining business and operational resilience. Deloitte Insights. Retrieved from 693_covid-19-banking/DI_COVID-19-banking.pdf (20.11.2020).

Bieszk-Stolorz, B., & Dmytrów. K. (2021). Evaluation of changes on world stock exchanges in connection with the SARS-CoV-2 pandemic. Survival analysis methods. Risks, 9(7), 121. doi: 10.3390/risks9070121.

BNP - BNP Paribas Bank Polska SA (2020). Sprawozdanie Zarządu z działalności Grupy Kapitałowej BNP Paribas Bank Polska S.A. w I półroczu 2020 r. Retrieved from aporty-okresowe (12.12.2020).

Borio, C. (2020). The prudential response to the Covid-19 crisis. Speech by Claudio Borio Head of the Monetary and Economic Department on the occasion of the Bank?s Annual General Meeting in Basel on 30 June 2020. Retrieved from (30.08.2020).

Carletti, E., Claessens, S., Fatás, A., & Vives, X. (2020). The bank business model in the post-Covid-19 world. London: Centre for Economic Policy Research. Retrieved from (11.12.2020).

Chaikovska, I. (2020). Safety assessment of Polish listed banks in 2015?2019. The method of quartile groups. Conference speech on 03.12.2020. 5th National Scientific Conference ?Protection and safety of financial services market participants. Effectiveness, diagnosis and prospects.? Łódź 3 December 2020. Retrieved from (05.12.2020).

Demirguc-Kunt, A., Pedraza, A., & Ruiz, C. (2020). Banking sector performance during the COVID-19 Crisis. World Bank Policy Research Working Paper Series, 9363.

Devi, S., Warasniasih, N., Masdiantini, P., & Musmini, L. (2020). The impact of COVID-19 pandemic on the financial performance of firms on the Indonesia stock exchange. Journal of Economics, Business, & Accountancy Ventura, 23(2), 226?242. doi: 10.14414/jebav.v23i2.2313.

Dias, R., Teixeira, N., Machova, V., Pardal, P., Horak, J., & Vochozka, M. (2020). Random walks and market efficiency tests: evidence on US, Chinese and European capital markets within the context of the global Covid-19 pandemic. Oeconomia Copernicana, 11(4), 585?608. doi: 10.24136/oc.2020.024.

Ding, W., Levine, R., Lin, Ch., & Xie, W. (2020). Corporate immunity to the COVID-19 pandemic. NBER Working Paper, 27055. doi: 10.3386/w27055.

Gerding, F., Martin, T., & Nagler, F. (2020). Sovereign debt and equity returns in the face of disaster. SSRN. doi:

Gormsen, N. J., & Koijen, R. S. J. (2020). Coronavirus: impact on stock prices and growth expectations. Working Paper. University of Chicago, Becker Friedman Institute of Economics, 2020-22. doi: 10.2139/ssrn.3555917.

Hartigan, J. A., & Wong, M. A. (1979). A k-means clustering algorithm. Applied Statistics, 28(1), 100?108. doi: 10.2307/2346830.

Hassan, T. A., Hollander, S., van Lent, L., & Tahoun, A. (2020). Firm-level exposure to epidemic diseases: Covid-19, Sars, and H1N1. Working Paper. Institute for New Economic Thinking, 119. doi: 10.36687/inetwp119.

ISDA (2021). The role of financial markets and institutions in supporting the global economy during the COVID-19 pandemic. Retrieved from (01.07.2021).

Iwedi, M., Gbarabe, E. L., & Uruah, N. K. (2020). The impact of COVID-19 on stock price of quoted banking firms in Nigeria. International Journal of Innovative Finance and Economics Research, 8(4), 33?39.

Korzeb, Z., & Niedziółka, P. (2020). Resistance of commercial banks to the crisis caused by the COVID-19 pandemic: the case of Poland. Equilibrium. Quarterly Journal of Economics and Economic Policy, 15(2), 205?234. doi: 10.24136/e q.2020.010.

Korzeb, Z., Niedziółka, P., & Silva, A. (2021). Impact of the COVID-19 crisis on the Portuguese banking system. Linear ordering method. Estudios Gerenciales, 37(159), 226?241. doi: 10.18046/j.estger.2021.159.4414.

Kuc-Czarnecka, M. (2020). COVID-19 and digital deprivation in Poland. Oeconomia Copernicana, 11(3), 415?431. doi: 10.24136/oc.2020.017.

Kulińska-Sadłocha, E., Marcinkowska, M., & Szambelańczyk, J. (2020). The impact of pandemic risk on the activity of banks based on the Polish banking sector in the face of COVID-19. Bezpieczny Bank, 2(79), 31-59. doi: 10.26354/bb.

Landier, A., & Thesmar, D. (2020). Earnings expectations in the covid crisis. NBER Working Papers, 27160. doi: 10.3386/w27160.

Li, L., Strahan, P. E., & Zhang S. (2020). Banks as lenders of first resort: evidence from the COVID-19 crisis. Review of Corporate Finance Studies, 9(3), 472?500. doi: 10.1093/rcfs/cfaa009.

MacKinlay, A.C. (1997). Event studies in economics and finance. Journal of Economic Literature, 35(1), 13?39.

NBP - Narodowy Bank Polski (2020). Raport o stabilności systemu finansowego. Ocena skutków pandemii COVID-19. Retrieved from (12.12.2020).

Pagano, M., Wagner, Ch., & Zechner, J. (2020). Disaster resilience and asset prices. CSEF Working Papers, 563.

Pietryka, I. (2016). Płynność sektora bankowego a skuteczność polityki pieniężnej Narodowego Banku Polskiego na tle Eurosystemu. Toruń: Instytut Badań Gospodarczych, Polskie Towarzystwo Ekonomiczne Oddział w Toruniu. doi: 10.24136/eep.mon.2016.1.

Ramelli, S., & Wagner, A. F. (2020). Feverish stock price reactions to COVID-19. Swiss Finance Institute Research Paper Series, 20-12. doi: 10.2139/ssrn.35 50274.

Sansa, N. (2020). The impact of the corona virus on the financial market: evidence from China and USA. Electronic Research Journal of Social Sciences and Humanities, 2(2), 29?39. doi: 10.2139/ssrn.3567901.

Santander - Santander Bank Polska SA (2020). Sprawozdanie Zarządu z działalności Grupy Kapitałowej Santander Bank Polska S.A. w I połowie 2020 roku. Retrieved from (06.12.2020).

Taleb, N., N. (2007). The black swan: the impact of the highly improbable. Random House.

Thorbecke, W. (2020). The impact of the COVID-19 pandemic on the U.S. economy: evidence from the stock market. Journal of Risk Financial Management, 13(10), 233. doi: 10.3390/jrfm13100233.

Waliszewski, K., & Solarz, J.K. (2020). Całościowe zarządzanie ryzykiem systemowym. Pandemia COVID-19. Kraków: Edu-Libri.

Waliszewski, K., & Warchlewska, A. (2021). How we can benefit from personal finance management applications during the COVID-19 pandemic? The Polish case. Entrepreneurship and Sustainability Issues, 8(4), 103?121. 10.9770/jesi.2 021.8.4(6).

Wu, D. D., & Olson D. L. (2020). The effect of COVID-19 on the banking sector. In D. D. Wu & D. L. Olson (Eds.). Pandemic risk management in operations and finance. Computational risk management. Cham: Springer, 89?99. Doi: 10.1007/978-3-030-52197-4_8.

Wucker, M. (2016). The gray rhino: how to recognize and act on the obvious dangers we ignore. London: St. Martin?s Press.

ZBP - Związek Banków Polskich (2020). Covid-19, banki i technologia ? w jaki sposób pandemia wpłynęła na sytuację w sektorze bankowym. Retrieved from _technologie_fin (10.12.2020).

Zhang, D., Hu, M., & Ji, Q. (2020). Financial markets under the global pandemic of COVID-19. Finance Research Letters, 36, doi: 10.1016/




How to Cite

Bernardelli, M., Korzeb, Z., & Niedziółka, P. (2021). The banking sector as the absorber of the COVID-19 crisis? economic consequences: perception of WSE investors. Oeconomia Copernicana, 12(2), 335–374.