This paper examined empirically financial integration impact on Nigeria economic growth volatility. Specifically, it identified some of the major key variables through which financial integration influence growth volatility in Nigeria. Three research hypotheses were stated from which an empirical model was formulated to link the influence of financial integration using economic output as explained variable and degree of openness, foreign private investment, exchange rate foreign debt as explanatory variables over the period of 1987– 2019. Multiple regression analysis was employed to estimate the relevant variables. In addition, we tested for stationarity and determined long run association between the variables of the models. The work also reconciled the disequilibrium which exists in the short and long run relationships of the variables in the models. The result showed a non-significant degree of openness but positively associated with gross domestic product. Foreign private investment was strongly and statistically significant to gross domestic product. It was therefore recommended that for Nigeria financial sector services to take substantial benefits of broad participation in globalization, the provision of sound macroeconomic policy framework with high degree of certainty of the future of investment is needed.

The study covered four (4) selected financial deepening estimators as it affects the economy as a whole. To carry out the study, data were sourced through Statistical Bulletin 2018 and World Bank Development Indicators (2018) from 2003 to 2018. Group of low-income countries have continued to find the need for adequate financial deepening in a bid to enhance their economic growth. Though they are operating a modern type of economy, yet they are mostly mono-economy, relying more on either oil or agricultural products and heavily depending on oil. Hence, Nigeria is a small open economy. In analyzing the data obtained, linear regression analysis was used through SPSS 22.0. The study formulated four (4) hypotheses and the findings showed that the ratio of money supply, credit ratio in private sector, savings ratio and investment have impact significantly on Gross Domestic Product in Nigeria because the p-value t-statistics are 0.0481, 0.027, 0.046 and.000 respectively are all less than 5% significant level. The study, therefore, identified the nexus by concluding that financial deepening has significant impact on Nigeria’s economic growth. This study recommends that government policies should be geared towards increased money supply and well-organized capital market that can improve general economic efficacy.