Keywords
moon phase effect
behavioral finance
financial markets
stock indexes
How to Cite
Abstract
The main objective of this study is to verify the occurrence of the moon phases effect among market indexes listed on the stock exchanges of CEE countries in the years 2020-2024 (period of increased market uncertainty). Based on the daily quotations of selected indexes, daily logarithmic returns were calculated on new moon and full moon days. Regarding the Wilcoxon signed-rank W test statistic, a significantly higher than zero median value was indicated for the entire research sample recorded on the new moon day (especially in the case of the Polish WIG and the Romanian BET). Notably, no significantly different of returns were recorded on the full moon day. The conclusions drawn from this study may constitute information for financial market researchers and investors investing in global markets, who may formulate investment strategies based on the conclusions drawn from the study. It is worth emphasising that the presented studies constitute one of the first attempts to verify the effect of the moon phases in a time of increased volatility of prices of financial instruments occurring in global markets, which is the research gap of this study.
References
Ariel, R. A. (1987). A monthly effect in stock returns. Journal of Financial Economics, 18(1), 161–174. https://doi.org/10.1016/0304-405X(87)90066-3
Bassiouny, A., Kiryakos, M., & Tooma, E. (2023). Examining the adaptive market hypothesis with calendar effects: International evidence and the impact of COVID-19. Global Finance Journal, 56, 100777. https://doi.org/10.1016/j.gfj.2022.100777
Bloom, N. (2009). The impact of uncertainty shocks. Econometrica, 77(3), 623–685. https://doi.org/10.3982/ECTA6248
Borowski, K. (2015a). Moon phases and rates of return of WIG index on the Warsaw Stock Exchange. International Journal of Economics and Finance, 7(8), 256–264. https://doi.org/10.5539/ijef.v7n8p256
Borowski, K. (2015b). The influence of moon phases on rates of return of the Warsaw Stock Exchange indices. Studia Prawno-Ekonomiczne, 98, 151–166. https://www.researchgate.net/publication/282815290_THE_INFLUENCE_OF_MOON_PHASES_ON_RATES_OF_RETURN_OF_THE_FOLLOWING_WARSAW_STOCK_EXCHANGE_INDICES_WIG20_MWIG40_AND_SWIG80
Brahmana, R., Hooy, C. W., & Ahmad, Z. (2011). Moon effect on Pacific Basin stock markets. Indonesian Capital Market Review, 3(2), 117–128. https://doi.org/10.21002/icmr.v3i2.3627
Buła, R. (2014). Efektywność informacyjna a zachowanie cen akcji tworzących indeks WIG20. Studia Ekonomiczne, 177, 152–167. https://www.researchgate.net/publication/263779692_Efektywnosc_informacyjna_a_zachowanie_cen_akcji_tworzacych_indeks_WIG20 (in Polish).
Buczek, S. (2005). Efektywność informacyjna rynków akcji: Teoria a rzeczywistość. Szkoła Główna Handlowa w Warszawie. (in Polish).
Buzała, P. (2015). Silna a półsilna forma efektywności informacyjnej rynku kapitałowego – doświadczenia z GPW w Warszawie na podstawie zaleceń analityków. Finanse, Rynki Finansowe, Ubezpieczenia, 75, 97–109. https://doi.org/10.18276/frfu.2015.75-08 (in Polish).
Cao, M., & Wei, J. (2005). Stock market returns: A note on temperature anomaly. Journal of Banking
& Finance, 29(6), 1559–1573. https://doi.org/10.1016/j.jbankfin.2004.06.028
Cross, F. (1973). The behavior of stock prices on Fridays and Mondays. Financial Analysts Journal, 29(6), 67–69. https://doi.org/10.2469/faj.v29.n6.67
Czerwonka, M., & Gorlewski, B. (2012). Finanse behawioralne: Zachowania inwestorów i rynku. Oficyna Wydawnicza Szkoły Głównej Handlowej. (in Polish).
Dąbrowska, D., Sołtysiak, M., Biniecka, P., Michalska, J., Wasilkowski, D., Nowak, A., & Nourani, V. (2019). Application of hydrogeological and biological research for the lysimeter experiment performance under simulated municipal landfill condition. Journal of Material Cycles and Waste Management, 21(6), 1477–1487. https://doi.org/10.1007/s10163-019-00900-x
Dichev, I. D., & Janes, T. D. (2003). Lunar cycle effects in stock returns. Journal of Private Equity, 6(4),
8–29. https://dx.doi.org/10.2139/ssrn.281665
Dragoș, V., & Oprea, D. (2014). Informational efficiency tests on the Romanian stock market: A review of the literature. Review of Finance and Banking, 6(1), 15–28. https://www.researchgate.net/publication/263928380_Informational_Efficiency_Tests_on_the_Romanian_Stock_Market_A_Review_of_the_Literature
Fama, E. F. (1965). The behavior of stock market prices. Journal of Business, 38(1), 34–105. https://doi.org/10.1086/294743
Floros, C., & Tan, A. (2013). Moon phases, mood and stock market returns: International evidence. Journal of Emerging Market Finance, 12(1), 107–127. https://doi.org/10.1177/0972652712473405
Forbes, G. B., & Lebo, G. R. (1977). Antisocial behavior and lunar activity: A failure to validate the lunacy myth. Psychological Reports, 40(3), 1309–1310. https://doi.org/10.2466/pr0.1977.40.3c.1309
Fuksiewicz, M. (2021). An extended list of calendar anomalies in the context of the efficient market hypothesis. Zeszyty Naukowe Wyższej Szkoły Bankowej w Poznaniu, 93(2), 89–102. https://www.researchgate.net/publication/356801706_An_extended_list_of_calendar_anomalies_in_the_context_of_the_efficient_market_hypothesis
Gajdošová, K., Heryán, T., & Tufan, E. (2011). Day of the week effect in the European emerging stock markets: Recent evidence from the financial crisis period. Scientific Papers of the University of Pardubice, Series D, 19, 38–51. https://www.semanticscholar.org/paper/Day-of-the-week-effect-in-the-European-emerging-the-Gajdosova-Tufan/c824a3eef194759a3f72599d594342707a274ffd
Gao, Q. (2009). Lunar phases effect in Chinese stock returns. In 2009 International Conference on Business Intelligence and Financial Engineering (pp.682-685). IEEE. https://doi.org/10.1109/BIFE.2009.159
Garzino, S. J. (1982). Lunar effects on mental behavior: A defense of the empirical research. Environment and Behavior, 14(4), 395–417. https://doi.org/10.1177/0013916582144001
Gatnar, E. (2015). Statystyczna analiza konwergencji krajów Europy Środkowej i Wschodniej po 10 latach członkostwa w Unii Europejskiej. Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu, 384, 93–99. https://www.dbc.wroc.pl/Content/29489/Gatnar_Statystyczna_Analiza_Konwergencji_Krajow_Europy_Srodkowej_2015.pdf (in Polish).
Gierszewski, J., & Dobrowolski, F. (2024). Efekt transylwański — związek między fazami Księżyca a liczbą zgłoszeń interwencji do Policji. Przegląd Policyjny, 152(4), 487–507. https://doi.org/10.5604/01.3001.0054.4328 (in Polish).
Grotowski, M. (2008). Efekty kalendarzowe na Giełdzie Papierów Wartościowych w Warszawie. Gospodarka Narodowa, 1–2, 55–75. https://ideas.repec.org/a/sgh/gosnar/y2008i1-2p55-75.html (in Polish).
Herbst, A. F. (2007). Lunacy in the stock market—What is the evidence? Journal of Bioeconomics, 9(1), 1–18. https://doi.org/10.1007/s10818-007-9016-3
Holden, K., Thompson, J., & Ruangrit, Y. (2005). The Asian crisis and calendar effects on stock returns in Thailand. European Journal of Operational Research, 163(1), 242–252. https://doi.org/10.1016/j.ejor.2003.07.005
Hong, N. N., Huong, P. T. M., & Linh, N. T. T. (2023). Does weather anomaly still affect the emerging stock market under the unexpected event? New evidence from the COVID-19 pandemic. Heliyon, 9(8), e18665. https://doi.org/10.1016/j.heliyon.2023.e18665
Hsieh, D. A. (1989). Testing for nonlinear dependence in daily foreign exchange rates. Journal of Business, 62(3), 339–368. https://www.jstor.org/stable/2353351
Investing.com. (2024, September 4). CBOE Volatility Index (VIX) – data. https://pl.investing.com/indices/volatility-s-p-500
Janicka, M. (2008). Efektywność rynków finansowych – teoria a praktyka. Acta Universitatis Lodziensis. Folia Oeconomica, 221, 169–182. https://dspace.uni.lodz.pl/bitstream/handle/11089/7579/166-179.pdf (in Polish).
Jasiniak, M. (2022). Efekty cenowe na polskim rynku kapitałowym. Wydawnictwo Uniwersytetu Łódzkiego. https://doi.org/10.18778/8220-862-7 (in Polish).
Kahneman, D., & Tversky, A. (1979). Prospect theory: An analysis of decision under risk. Econometrica, 47(2), 263–292. https://doi.org/10.2307/1914185
Kahneman, D., & Tversky, A. (1982). Belief in the law of small numbers. In D. Kahneman, P. Slovic, &
A. Tversky (Eds.), Judgment under uncertainty: Heuristics and biases (pp. 23–31). Cambridge University Press.
Kamaly, A., & Tooma, E. A. (2009). Calendar anomalies and stock market volatility in selected Arab stock exchanges. Applied Financial Economics, 19(11), 881–892. https://doi.org/10.1080/09603100802359976
Kamstra, M. J., Kramer, L. A., & Levi, M. D. (2003). Winter blues: A SAD stock market cycle. American Economic Review, 93(1), 324–343. https://doi.org/10.1257/000282803321455322
Kathiravan, C., Selvam, M., Maniam, B., & Dharani, M. (2021). Effect of weather on stock market:
A literature review and research agenda. Cogent Economics & Finance, 9(1), 1971353. https://doi.org/10.1080/23322039.2021.1971353
Keef, S. P., & Khaled, M. S. (2011). Are investors moonstruck? Further international evidence on lunar phases and stock returns. Journal of Empirical Finance, 18(1), 56–63. https://doi.org/10.1016/j.jempfin.2010.11.002
Kim, J., & Shamsuddin, A. (2019). Stock market anomalies: An extreme bounds analysis [Conference paper]. https://www.researchgate.net/publication/355807182_Stock_Market_Anomalies_An_Extreme_Bounds_Analysis
Kozeniauskas, N., Orlik, A., & Veldkamp, L. (2018). What are uncertainty shocks? Journal of Monetary Economics, 100, 1–15. https://doi.org/10.1016/j.jmoneco.2018.06.004
Kramer, L. A., & Weber, J. M. (2011). This is your portfolio on winter: Seasonal affective disorder and risk aversion in financial decision making. Social Psychological and Personality Science, 3(2), 193–199. https://doi.org/10.1177/1948550611415694
Laganà, A., Burgio, M., Retto, G., Pizzo, A., Sturlese, E., Granese, R., & Triolo, O. (2014). Analysis of the influence of lunar cycle on the frequency of spontaneous deliveries: A single-centre retrospective study. Kathmandu University Medical Journal, 12(4), 233–237. https://doi.org/10.3126/kumj.v12i4.13726
Lee, M. H., Lee, M. C., Chiu, B. Y., & Lee, C. H. (2014). Do lunar phases affect US REIT returns? Investment Analysts Journal, 43(79), 67–78. https://doi.org/10.1080/10293523.2014.11082570
Liew, V. K. S., Chia, R. C. J., Riaz, S., & Lau, E. (2022). Is there any day-of-the-week effect amid the COVID-19 panic in the Malaysian stock market? Singapore Economic Review, 67(5), 1665–1679. https://doi.org/10.1142/S021759082250014X
Lilliefors, H.W. (1967). On the Kolmogorov-Smimov test for normality with mean and variance unknown. Journal of the American Statistical Association, 62, 399-402. https://doi.org/10.2307/2283970
Lingaraja, K. (2013). Lunar effect and stock market. Journal of Business Management Studies, 9(2), 88–90. https://www.researchgate.net/publication/264860619_LUNAR_EFFECT_AND_STOCK_MARKET
Lizińska, J. (2017). On the rationality of investors – Lunar phases and equity returns in Poland. Finanse, Rynki Finansowe, Ubezpieczenia, 89(2), 131–141. https://doi.org/10.18276/frfu.2017.89/2-10
Lucey, B. M. (2010). Lunar seasonality in precious metal returns? Applied Economics Letters, 17(9), 835–838. https://doi.org/10.1080/17446540802516188
Mahdian, S., & Perry, M. J. (2002). Anomalies in US equity markets: A re-examination of the January effect. Applied Financial Economics, 12(2), 141–145. https://doi.org/10.1080/09603100110088067
Mathew, V. M., Lindesay, J., Shanmuganathan, N., & Eapen, V. (1991). Attempted suicide and the lunar cycle. Psychological Reports, 68(3), 927–930. https://doi.org/10.2466/pr0.1991.68.3.927
Mishra, S. (2017). Volatility and calendar anomaly through GARCH model: Evidence from the selected G20 stock exchanges. International Journal of Business and Globalisation, 19(1), 126–144. https://www.inderscienceonline.com/doi/abs/10.1504/IJBG.2017.085105
Mittal, A. K., Nayok, S. B. R., Munoli, R. N., Praharaj, S. K., & Sharma, P. S. V. N. (2021). Does lunar synodic cycle affect the rates of psychiatric hospitalizations and sentinel events? Chronobiology International, 38(3), 360–366. https://doi.org/10.1080/07420528.2020.1849253
Moonphases.co.uk. (2024, September 20). Moon calendar. https://moonphases.co.uk/moon-calendar
Ozkan, O. (2021). Impact of COVID-19 on stock market efficiency: Evidence from developed countries. Research in International Business and Finance, 58, 101445. https://doi.org/10.1016/j.ribaf.2021.101445
Peters, E. E. (1997). Teoria chaosu a rynki kapitałowe (K. Środa, Trans.). WIG-Press. (in Polish).
Pera, J. (2019). Default and equity risk premium in the conditions of globalization and the internationalisation of the biggest capital markets of the EU and GFCI countries: Ex post implied equity premium analysis. Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu, 63(7), 82–91. https://doi.org/10.15611/pn.2019.7.07
Piasecki, K., & Tomasik, E. (2013). Rozkłady stóp zwrotu z instrumentów polskiego rynku kapitałowego. Kraków: edu-Libri. (in Polish).
Rossi, M. (2015). The efficient market hypothesis and calendar anomalies: A literature review. International Journal of Managerial and Financial Accounting, 7(3–4), 285–296. https://www.researchgate.net/publication/295901862_The_efficient_market_hypothesis_and_calendar_anomalies_A_literature_review
Shapiro, S. S., & Wilk, M. B. (1965). An analysis of variance test for normality (complete samples). Biometrika, 52(3–4), 591–611. https://doi.org/10.1093/biomet/52.3-4.591
Stereńczak, S. (2025). Illiquidity and stock returns: The moderating role of investors’ holding period in Central and Eastern European markets. International Journal of Emerging Markets, 19(7), 2025–2045. https://doi.org/10.1108/IJOEM-01-2022-0125
Stooq.com. (2024, September 29). Historical data. https://stooq.pl/
Szymański, M., & Wojtalik, G. (2020). Calendar effects in the stock markets of Central European countries. Acta Universitatis Lodziensis. Folia Oeconomica, 5(350), 27–51. https://doi.org/10.18778/0208-6018.350.02
Taleb, N. N. (2010). The black swan: The impact of the highly improbable (2nd ed.). Penguin Books.
Tauseef, S. (2023). Herd behaviour in an emerging market: An evidence of calendar and size effects. Journal of Asia Business Studies, 17(3), 639–655. https://doi.org/10.1108/JABS-10-2021-0430
Thakur, S. (2020). Effect of COVID-19 on capital market with reference to S&P 500. International Journal of Advanced Research, 8(6), 1180–1188. https://dx.doi.org/10.2139/ssrn.3640871
Trifan, R. (2021). Is the investor’s biorhythm affecting the stock market? In D. Procházka (Ed.), Digitalization in finance and accounting (pp. 71-82). Springer. https://doi.org/10.1007/978-3-030-55277-0_7
XTB. (2024,). Indeks VIX – jak inwestować w indeks zmienności (VOLX)? https://www.xtb.com/pl/edukacja/vix-trading (in Polish).
Yahya, F., Shaohua, Z., Abbas, U., & Waqas, M. (2021). COVID-19-induced returns, attention, sentiments and social isolation: Evidence from dynamic panel model. Global Business Review, 26(2), 481-499. https://doi.org/10.1177/0972150921996174
Yousop, N. L. M., Sipon, Z., & Yoke, S. K. (2014). Lunar effect: Analysis on emerging countries stock returns, prior and during financial crisis. Journal of Emerging Economies and Islamic Research, 2(2), 1–15. https://www.researchgate.net/publication/286151060_Lunar_Effect_Analysis_on_Emerging_Countries_Stock_Returns_Prior_and_During_Financial_Crisis
Yuan, K., Zheng, L., & Zhu, Q. (2006). Are investors moonstruck? Lunar phases and stock returns. Journal of Empirical Finance, 13(1), 1–23. https://doi.org/10.1016/j.jempfin.2005.06.001
Wang, Y., Lin, C., & Chen, W. (2018). Does lunar cycle effect exist? Lunar phases and stock return volatilities. International Journal of Management and Business Studies, 8(4), 1–6. https://www.internationalscholarsjournals.com/articles/does-lunar-cycle-effect-exist-lunar-phases-and-stock-return-volatilities.pdf
Wilcoxon, F. (1945). Individual comparisons by ranking methods. Biometrics Bulletin, 1(6), 80–83. https://doi.org/10.2307/3001968
Zhang, D., Hu, M., & Ji, Q. (2020). Financial markets under the global pandemic of COVID-19. Finance Research Letters, 36, 101528. https://doi.org/10.1016/j.frl.2020.101528
Zielińska-Chmielewska, A. (2023). Financial efficiency vs. environmental efficiency on the example of the meat and poultry industry in Poland. Economics & Environment, 85(2), 198–219. https://doi.org/10.34659/eis.2023.85.2.556
Zielonka, P. (2008). Behawioralne aspekty inwestowania na rynku papierów wartościowych. CeDeWu. (in Polish).
Ziliak, S. T. (2008). Retrospectives: Guinnessometrics: The economic foundation of "Student's" t. Journal of Economic Perspectives, 22(4), 199–216. https://doi.org/10.1257/jep.22.4.199
Żebrowska-Suchodolska, D. (2021). Calendar anomalies among food sector companies listed on the Warsaw Stock Exchange. The Polish Statistician, 66(10), 1–19. https://doi.org/10.5604/01.3001.0015.4108
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