Authors : Gabriel Etim Umoren; John Olatunde Olaleye; Ogunluyi Eyitayo Sunday

Volume/Issue : Volume 10 - 2025, Issue 8 - August

Google Scholar : https://tinyurl.com/mw38tkwk

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DOI : https://doi.org/10.38124/ijisrt/25aug237

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Abstract : The objective of the paper was to determine the dependence structure between stock market returns and short- term interest rates in Nigeria using a copula-based statistical model. Daily price data of the All-Share Index (ASI) from the Nigeria Stock Exchange and short-term interest rate, represented by the prime lending rate from March 1999 to December 2001 and the Monetary Policy Rate (MPR) from January 2002 to December 2022 from the Central Bank of Nigeria, were collected for the study. Student's t-copula was selected for the study as it considers the variables' non-linear dependencies and tail risks, which were not accounted for in previous research on subjects that used traditional linear statistics models. Short-term interest rates were relatively stable in the years of the study, while stock returns show high volatility, non-normal characteristics, and significant zero-peaked returns. The copula student's t-test, along with maximum likelihood estimation and subsequent goodness-of-fit tests, shows minimal tail dependence between the variables. This means that stock market return does not significantly depend on the short-term interest rate in Nigeria, and changes in short-term interest rates only explain a small part of the variation in stock market returns. Validity tests using the rolling window correlations and contour plots support the above findings. The study contributes to an in-depth understanding of the Nigerian market dynamics and highlights the importance of using advanced statistical analysis techniques for risk assessment, investment, and economic policy decision-making in Nigeria's financial markets.

Keywords : Copula, Dependence, Stock Returns, Short Term Interest Rate, All Share Index, Monetary Policy, Nigeria.

References :

1. Formulae in this section are from: Frees and Valdea (1988), Eling and Dennis (2009), Michelis and Ning (2010) Ning (2010), Kim, Tabacu and Jung (2020), and Dewick and Shuangzhe (2022).
2. John, Emmanuel Isaac. "Effect of macroeconomic variables on stock market performance in Nigeria." Journal of Economics, Management and Trade 22(6), 2019, 1-14.
3. Temuhale, Julius, and Austin A. Achugbu. "Effects of Macroeconomic Variables on StockMarket Returns in Nigeria (1986-2016)." Journal of Economics and Finance (IOSR-JEF), 10 (1), 2019, 51-63.
4. N. I. Abu & U. Ibekwe. "Macroeconomic determinants of stock market performance in Nigeria." Fuoye Journal of Finance and Contemporary Issues, 5(1), 2023.
5. B.A. Olarewaju, I. U. Harrison, B. G. Bolanle, O. I. Dauda, B. Gbemisola, O. Gbolahan & T. Adeyinka. "Framework for an agent-based model for stock price prediction in Nigeria." Journal of Computer Science and Control Systems, 13(1), 2020, 17-24
6. B. Y. Chang, P. Christoffersen & K. Jacobs. "Market skewness risk and the cross section of stock returns." Journal of Financial Economics. 107(1), 2013, 46-68.
7. F. S. Mishkin "Improving the use of discretion in monetary policy." International Finance, 21(3), 2018, 224-238.
8. Haugh, Martin. "An introduction to copulas." IEOR E4602: quantitative risk management. Lecture notes. Columbia University (2016).
9. Dorey, Martyn, and Phil Joubert. "Modelling copulas: an overview." The Staple Inn Actuarial Society (2005): 1-27.
10. Dorey, Martyn, and Phil Joubert. "Modelling copulas: an overview." The Staple Inn Actuarial Society (2005): 1-27.
11. R. Vishwanath & C. Krishnamurti, eds. Investment management: A modern guide to security analysis and stock selection. Springer Science & Business Media, 2009.
12.   K, P, Lim & R. Brooks. The evolution of stock market efficiency over time: A survey of the empirical literature. Journal of economic surveys, 25(1), 2011, 69-108.
13. R. K. Frank. Investment analysis and portfolio Management, Citic Publishing House, 2002
14. R. Zagst, Interest rate management. Vol. 46. Berlin: Springer, 2002.
15. B. Dupor. "Investment and interest rate policy." Journal of Economic Theory. 98, no. 1 (2001): 85-113.
16. M. T. Belongia & P. N. Ireland. "Interest rates and money in the measurement of monetary policy." Journal of Business & Economic Statistics 33(2), 2015, 255-269.
17. Fama, Eugene F., and Kenneth R. French. "Multifactor explanations of asset pricing anomalies." The journal of finance 51, no. 1 (1996): 55-84.
18. Fama, Eugene F. "Efficient market hypothesis: A review of theory and empirical work." Journal of Finance 25, no. 2 (1970): 28-30.
19. Katata, Kabir. "Modelling Stock Market Dependence Between Nigeria’s and Other Stock Markets Using Unconditional Copula." Nigerian Journal of Securities Market, NJSM 3, no. 2 (2020): 88-111.
20. Kim, Jong-Min, Lucia Tabacu, and Hojin Jung. "A quantile-copula approach to dependence between financial assets." The North American Journal of Economics and Finance 51 (2020): 101066.
21. J.C. Alugbuo & E.J. Chika. "Monetary policy and stock market performance: Evidence from Nigeria stock exchange market." International Journal of Research and Innovation in Social Science, 4 (5), 2020, 556-566.
22. F. T. Kolapo, M. O. Oke & T. O. Olaniyan. "Unravelling the impact of macroeconomic Fundamentals on stock market performance in Nigeria: An ARDL-bound testing approach." Journal of Economics, Management and Trade, 3 (21), 2018, 1-15.
23. C.M. Umezurike, F. N. Echekoba & A. C. Ananwude. "Does Monetary Policy Affect Stock Market Return? Recent Evidence from the Nigerian Stock Exchange (1986-2018)." South Asian Journal of Social Studies and Economics, 5(3), 2019, 1-8.
24. J. S. Babangida, "Effect of monetary policy on the Nigerian stock market: A smooth transition autoregressive approach." CBN Journal of Applied Statistics, 12(1). 2021, 1-21.
25. U. G. Ogbonna & C. A. Ejem, “Do Monetary Policy Instruments Influence Capital Market Returns in Nigeria?”. American Finance & Banking Review, 5(1), 2020, 50-61.
26. J. Temuhale & A.  A. Achugbu. "Effects of macroeconomic variables on stock market returns in Nigeria (1986-2016)." Journal of Economics and Finance (IOSR-JEF), 10 (1), 2019, 51-63.
27. N. I. Abu & U. Ibekwe. "Macroeconomic determinants of stock market performance in Nigeria." Fuoye Journal of Finance and Contemporary Issues, 5 (1), 2023.
28. S.S. Udo, F. I. Odey, & A. O. Jacob. "Effects of selected macroeconomic variables on stock market performance in Nigeria." Malaysian E-Commerce Journal (MECJ), 6(2), 2022, 54-58.
29. C. Chola. "The Effect of Selected Macroeconomic Factors on a Stock Market Performance in Zambia." Management Journal for Advanced Research, 4 (1), 2024, 102-113.
30. B.A. Olarewaju, I.U. Harrison, B. G. Bolanle, O. I. Dauda, B. Gbemisola, O. Gbolahan &  T. Adeyinka. "Framework for an agent-based model for stock price prediction in Nigeria." Journal of Computer Science and Control Systems, 13(1), 2020, 17-24.
31. NGX Q1 Fact Sheet. Nigeria (2022)
32. NGX Q1 Fact Sheet. Nigeria (2022)