Digital Financial Development and the Effectiveness of Monetary Policy: Evidence from South Africa

Studies on the implications of digital financial development and their impact on monetary policy effectiveness have shown mixed results, with some evidence of interdependence and potential transmission challenges. While some studies highlight positive growth impacts moderated by institutions with risks to policy sovereignty from innovations, research on South Africa remains minimal, despite having a mature financial system and rapid uptake of digital finance. The study used an ARDL model with the digital financial development index, inflation, interest rate, financial deepening, and an interaction of the digital financial development index and interest rate to analyse the implications of digital finance and its impact on monetary policy effectiveness in South Africa. Utilising annual data from 1990 to 2024, the results showed that the digital financial development index positively influences inflation in the long run. In addition, interest rates have a significant negative impact on inflation in the long run, while financial deepening, exchange rate and GDP per capita are insignificant in the long run. Furthermore, interest rate interactions with the digital financial development index exert downward inflationary pressure, but the interaction term is statistically significant in the long run. Therefore, digital financial development mitigates the inflationary effect of interest rates and appear to strengthen the monetary policy effectiveness in controlling inflation in the long run. We recommend that policymakers consider incorporating digital financial development indicators into the model for determining interest rates when developing a strategy to control inflation, thereby enhancing monetary policy effectiveness.