Impact of Financial Technology Adoption on Financial Inclusion and Monetary Policy Effectiveness: A Comparative Study of Nigeria and Brazil (2010-2024)

Over the past decade and a half, financial technology (fintech) has reshaped financial systems in many emerging economies, promising to expand financial inclusion and potentially alter the transmission of monetary policy. Nigeria and Brazil stand out as large middle‑income countries that have combined ambitious digital financial reforms with rapid growth of private fintech ecosystems. This article reviews evidence from 2010 to 2024 to examine how fintech adoption has influenced financial inclusion outcomes and monetary policy effectiveness in both countries. Drawing on an integrative review of academic studies, central bank and international organization reports, and industry analyses, the article first develops a conceptual framework linking fintech, inclusion and monetary transmission. It then compares the evolution of fintech ecosystems, inclusion indicators and credit dynamics in Nigeria and Brazil, highlighting similarities and contrasts in regulatory approaches, business models and public digital infrastructure. The review finds that in both countries, digital payments, mobile channels and platform‑based finance have substantially lowered barriers to account ownership and usage, especially among previously underserved groups, although important gaps remain in Nigeria. At the same time, available evidence suggests that, so far, fintech credit remains too small to materially weaken aggregate monetary policy transmission, even as it changes the composition of lenders and borrowers. The article concludes with policy lessons for regulators seeking to harness fintech for inclusive growth while safeguarding monetary policy effectiveness, and identifies avenues for future empirical research.