Testing Causality and Cointegration Between Saving and Investment in Bangladesh

Interaction between saving and investment has been a major concern to the economists and there exists substantial debate over the nature of long run relationship between them. Thus, the main objective of this paper is to examine the dynamic linkages between saving and investment in Bangladesh using annual time series data covering the period from 1980 to 2014. The stationarity of the data is examined by using the Augmented Dickey-Fuller (ADF) and Phillips-Perron (PP) unit root tests. This paper applied the Johansen-Juselius cointegration test to examine the long run relationship between saving and investment. In order to show the direction of causal relationship between saving and investment, the widely used Granger causality test has been used. The unit root tests revealed that both saving and investment are non-stationary at level forms and they become stationary after taking their first difference. The Johansen-Juselius cointegration analysis suggests that, there exists a long run relationship between saving and investment as it is confirmed by both the Trace and Maximum Eigen-value test statistics. Results found from the Granger causality test suggests that unidirectional causality running from saving to investment existed in Bangladesh over the sample period for a lag length of two periods. Based on the results, pursuance of policy measures towards mobilizing domestic saving is recommended.