Abstract
The configurations of volatility and leverage effect in financial markets play important roles in portfolio management, especially in asset allocation, asset pricing, portfolio selection, portfolio diversification, and risk management. This paper examines the phenomenon of volatility clustering and leverage effect (asymmetry) in stock returns of the Nigerian stock market, using the daily All Shares Index of the Nigerian Stock Exchange during the 7-year period, covering 4th January 2010 through 2nd August 2016. Descriptive statistics, Generalized Autoregressive Conditional Heteroscedasticity (GARCH (1.1) and Glosten, Jagannathan and Runkle Autoregressive Conditional Heteroscedasticity (GJR-GARCH (1.1) were employed in the data estimation. The results affirm the presence of volatility clustering, persistent clustering and significant leverage effects of stock returns in the Nigerian stock market. The findings have policy implications for the regulation and policy expediency of measures that progressively checkmate the patterns of volatility in the Nigerian stock market as well as control negative news (such as insecurity, political instability, and macroeconomic policy inconsistency) which largely increase the level of market uncertainty and investors’ exposure to risks in the market.
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