The Conundrum of Stock Market Performance and Gross Domestic Product: An Empirical Evidence from Kenya

Stock Market Performance, Granger Causality, Cointergration

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April 20, 2022

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 The main objective of this study was to establish is the difficult question among researchers on the direction of relationship between the stock market performance and the gross domestic product using an empirical evidence from Kenya. Both theoretical and empirical reviews have presented a puzzle especially in the long run relationship between the two variables and empirical investigations in various country contexts , time varying longitudinal periods and other settings have continued to provide conflicting results. The study employed quarterly statistics of the Nairobi All Share Index (NASI) obtained from the Capital Markets Authority Bulletins and quarterly Gross Domestic Product rates from 2012-2019 obtained from Kenya National Bureau of Statistics and applied the Engle granger causality test and establish the link between stock market performance and economic growth in the long run (i.e. whether stock market performance causes economic growth or itself is a consequence of increased economic activity). The statistical techniques used included the unit root Augmented Dickey Fuller (ADF) test in order to test the stationarity for all the time series in their levels and first differences. The Johansen co-integration test to investigate whether the variables are cointegrated of the same order taking into account the trace statistics and the maximum eigen-value tests. The data was transformed into natural logarithms and normalized for further analysis. Both GDP and NASI were found to be stationery at level and upon first difference after ADF tests. The findings were that there was none directional/No causal relationship between the two variables after conducting a pairwise granger causality test, however there was a significant cointergrating equation on the variables, signifying the long run relationship between the two variables. From the results, it was inferred that the movement of stock prices in the Nairobi stock exchange reflect the macroeconomic condition in the long run of the country and can therefore be used to predict the future path of economic growth however the puzzle continues on causality.