Abstract
With so many countries of the world now open to global capital and trade, this study identifies whether financial and trade openness contribute to the development of Nigeria’s financial system by considering both financial depth and access to finance indicators. To achieve this objective, we applied the Simultaneous Openness Hypothesis as our theoretical framework and the Generalized Method of Moments (GMM) as our estimation method. Our findings reveal that opening trade while neglecting capital (vice versa) may be detrimental to the development of Nigeria financial system. In view of this evidence, we recommend that the simultaneous opening of trade and finance is a more guaranteed way of ensuring improved financial development in Nigeria.