Selected paper

Seďa, Petr del Río, Juan Antonio Jimber del Río García-Moreno García, María de los Baños
Empirical Testing of the Response of Czech Stock Market to Downgrades of Greek Credit Rating in the Light of the Efficient Market Hypothesis
Year: 2018
Volume: 9
Issue: 1
Pages: 51-71
JEL: C12, G14, G18
DOI: 10.5817/FAI2018-1-4


CAPM, Czech stock market, event study, semi-strong form of efficiency, nonparametric tests

Empirical testing of the linkages between macroeconomic news and asset price movements in terms of response to released macroeconomic information have been a subject of many investigations using different testing methods. The objective of this paper is to study the impact of announcements of Greek credit rating downgrades on the prices of the most liquid assets quoted in the Czech stock market. This issue is tightly related to semi-strong form of the efficient market hypothesis, which is one of possible analytical approaches when analyzing behaviour of assets in financial markets. The reaction of the Czech stock market is assessed in relation to seven announcements of Moody´s rating agency regarding changes of credit rating of Greek government bonds in the period 2009–2012. For the purpose of this paper, the event study methodology is applied. The basic idea of this statistical method is to determine values of abnormal returns, which can be defined as a difference between actual and equilibrium returns. In order to calculate equilibrium returns, the Capital Asset Pricing Model (CAPM) is used. The differences between actual and equilibrium returns are then verified with a help of selected nonparametric statistical tests. Namely, the exact sign test and the Wilcoxon signed-rank test are utilized. Based on results of nonparametric statistical tests, the null hypothesis of information efficiency of the Czech stock market is conclusively rejected.


Albuquerque, R. and Vega, C. (2009). Economic News and International Stock Market Co-movement. Review of Finance, 13(3), pp. 401–465. DOI: 10.1093/rof/rfn020. Ashley, J. W. (1962). Stock Prices and Changes in Earnings and Dividends: Some Empirical Results. Journal of Political Economy, 70(1), pp. 82-85. Beigi, M. H. A. and Budzinski, O. (2013). Reservations on the Use of Event Studies to Evaluate Economic Policy. Intereconomics, 48(3), pp. 174–179. DOI: 10.1007/s10272-013-0459-6. Březinová, J. (2013). Testování středně silné formy efektivnosti vybraných akciových trhů. (Unpublished master's thesis). VŠB – Technical University of Ostrava. Boyd, J. H., Hu, J. and Jagannathan, R. (2005). The Stock Market’s Reaction to Unemployment News: Why Bad News is Usually Good for Stocks. Journal of Finance, 60(2), pp. 649–672. DOI: 10.1111/j.1540-6261.2005.00742.x. Büttner, D., Hayo, B. (2012). EMU-Related News and Financial Markets in the Czech Republic, Hungary and Poland. Applied Economics, 44(31), pp. 4037–4053. DOI: 10.1080/00036846.2011.587775. Büttner, D., Hayo, B., Neuenkirch, M. (2012). The Impact of Foreign Macroeconomic News on Financial Markets in the Czech Republic, Hungary, and Poland. Empirica, 39(1), pp. 19-44. DOI: 10.1007/s10663-010-9153-0. Campbell, J. Y., Lo, A. W. and MacKinlay, A. C. (1997). The Econometrics of Financial Markets. 2nd ed. New York: Princeton University Press. Corrado C. J. and Truong C. (2008). Conducting Event Studies with Asia-Pacific Security Market Data. Pacific-Basin Finance Journal, 16(5), pp. 493–521. DOI: 10.1016/j.pacfin.2007.10.005. Cready, W. M. and Gurun, U. G. (2010). Aggregate Market Reaction to Earnings Announcements. Journal of Accounting Research, 48(2), pp. 289-334. DOI: 10.1111/j.1475-679X.2010.00368.x. Dimpfl, T. (2011). The Impact of US News to the German Stock Market - An Event Study Analysis. The Quarterly Review of Economics and Finance, 51(4), pp. 389–398. DOI: 10.1016/j.qref.2011.07.005. Dolley, J. C. (1933). Characteristics and Procedure of Common Stock Split-Ups. Harvard Business Review, 11(1), pp. 316-326. Égert, B. and Kočenda, E. (2014). The Impact of Macro News and Central Bank Communication on Emerging European Forex Markets. Economic Systems, 38(1), pp. 73–88. DOI: 10.1016/j.ecosys.2013.01.004. Fama, E. F. (1970). Efficient Capital Markets: A Review of Theory and Empirical Work. Journal of Finance, 25(2), pp. 383-417. Fama, E. F. (1969). The Adjustment of Stock Prices to New Information. International Economic Review, 10(1), pp. 1-21. Gurgul, H. and Wójtowicz, T. (2014). The Impact of US Macroeconomic News on the Polish Stock Market. The Importance of Company Size to Information Flow. Central European Journal of Operations Research, 22(4), pp. 795–817. DOI: 10.1007/s10100-014-0343-x. Gurgul, H. and Wójtowicz, T. (2015). The Response of ATX Intraday Returns to U.S. Macroeconomic News. Czech Journal of Economics and Finance, 65(3), pp. 230–253. Hanousek, J. and Kočenda, E. (2011). Foreign News and Spillovers in Emerging European Stock Markets. Review of International Economics, 19(1), pp. 170-188. DOI: 10.1111/j.1467-9396.2010.00939.x. Hanousek, J., Kočenda, E. and Kutan, A. M. (2009). The Reaction of Asset Prices to Macroeconomic Announcements in New EU Markets: Evidence from Intraday Data. Journal of Financial Stability, 5(2), pp. 199–219. Harju, K. and Hussain, S. M. (2011). Intraday Seasonalities and Macroeconomic News Announcements. European Financial Management, 17(2), pp. 367–390. DOI: 10.1111/j.1468-036X.2009.00512.x. Hendl, J. (2009). Přehled statistických metod: Analýza a metaanalýza dat, 3rd ed. Praha: Portál. Kiete, K. and Uloza, G. (2005). The Information Efficiency of the Stock Markets in Lithuania and Latvia. Working Paper no. 75. Stockholm School of Economics in Riga. Kim, S. J., Nguyen, D. Q. T. (2009). The Spillover Effects of Target Interest Rate News from the US Fed and the European Central Bank on the Asia-Pacific Stock Markets. Journal of International Financial Markets, Institutions and Money, 19(3), pp. 415–31. Kohout, P. (1995). Nelineární CAPM. Finance a úvěr, 45(8), pp. 429-442. Lintner, J. (1965). The Valuation of Risk Assets and the Selection of Risky Investments in Stock Portfolios and Capital Budgets. Review of Economics and Statistics, 47(1), pp. 13-37. MacKinlay, A. C. (1997). Event Studies in Economics and Finance. Journal of Economic Literature, 35(3), pp. 13-39. Mavridis, S. (2018). Greece’s Economic and Social Transformation 2008–2017. Social Sciences. 7(1), pp. 1-14.DOI: 10.3390/socsci7010009. Nikkinen, J., Omran, M., Sahlström, M. and Äijö, A. (2006). Global Stock Market Reactions to Scheduled U. S. Macroeconomic News Announcements. Global Finance Journal, 17(1), pp.92–104. DOI: 10.1016/j.gfj.2006.06.003. Seďa, P. (2012). Impact of the Global Financial Crisis on Stock Market Volatility: Evidence from Central European Stock Market. In: Mathematical Methods in Economics, Karviná: Silesian University in Opava, pp. 787-792. Seďa, P. and Jimber del Río, J. A. (2014). Ekonometrická analýza vzájemných vazeb akciových trhů zemí střední Evropy v kontextu finanční krize. In: Řízení a modelování finančních rizik. Sborník příspěvků ze 7. mezinárodní vědecké konference, Ostrava: VŠB-Technical University of Ostrava, pp. 691-699. Seďa, P. and Jimber del Río, J. A. (2016). Testing the Weak Form of Efficiency on Chinese Stock Market. In: European Financial Systems 2016. Proceedings of the 13th International Scientific Conference, Brno: Masaryk University, pp. 669-677. Sharpe, W. F. (1964). Capital Asset Prices – A Theory of Market Equilibrium under Conditions of Risk. Journal of Finance, 19(3), pp. 425–442. Singh, M., Nejadmalayeri, A. and Lucey, B. (2013). Do U.S. Macroeconomic Surprises Influence Equity Returns? An Exploratory Analysis of Developed Economies. The Quarterly Review of Economics and Finance, 53(2013), pp. 476–485. DOI: 10.1016/j.qref.2013.05.002. Sorokina, N., Booth, D. E. and Thornton, J. H. (2013). Robust Methods in Event Studies: Empirical Evidence and Theoretical Implications. Journal of Data Science, 11, pp. 575-606. Švihlíková, I. (2010). Globalizace a krize, 1st Ed. Praha: Grimmus. Tran, V. Q. (2007). Testing the Weak Form of Efficiency on Czech Stock Market. Politická ekonomie, 6(6), pp. 751-772. DOI: 10.18267/j.polek.622. Trung, C. (2011). Post-Earnings Announcement Abnormal Return in the Chinese Equity Market. Journal of International Financial Markets, Institutions and Money, 2(5), pp. 637-661. DOI: 10.1016/j.intfin.2011.04.002

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