Financial Deepening and Economic Growth in Nigeria: An Error Correction Approach

Financial Deepening and Nominal Output Dynamics in Nigeria: Evidence from Quarterly Digital Payments and Private-Sector Credit

This study examines the relationship between financial deepening and output in Nigeria using 56 quarterly observations from 2012Q1 to 2025Q4. The supplied dataset contains current-value naira series for gross domestic product (GDP), Point-of-Sale (POS) transactions, mobile payments, and credit to the private sector (CPS). Consequently, the dependent variable measures nominal output rather than real economic growth. All series were transformed into natural logarithms. Seasonal augmented Dickey-Fuller tests show that the four log-level series are non stationary but become stationary after first differencing. A stationary seasonal distributed-lag model was therefore estimated in quarterly log changes, with lagged financial variables, a four quarter output-growth term, quarterly effects, a trend, a COVID-19 intervention dummy, and a 2025Q1 data-discontinuity control. Newey-West heteroskedasticity- and autocorrelation consistent standard errors were used. Lagged POS growth, mobile-payment growth, and CPS growth are individually insignificant, and they are jointly insignificant (F = 0.769, p = 0.518). The results do not support the earlier claim that the three financial-deepening indicators exert positive and significant short-run and long-run effects on economic growth. A defensible real growth analysis requires real GDP and consistently deflated financial variables.

Integrated Economies and Policy Insights

Investment Dynamics and Capital Formation in Pakistan: Financial Intermediation, Industrial Transformation and Macroeconomic Stability: A VECM Analysis

Pakistan continues to experience persistently low levels of capital formation, constraining long-term economic growth and productive capacity. This study examines the macroeconomic determinants of Gross Fixed Capital Formation (GFCF) in Pakistan within the framework of financial intermediation, industrial performance, and macroeconomic stability over the period 1991–2024. Annual time-series data are analysed using the Augmented Dickey–Fuller (ADF) unit root test, the Johansen cointegration approach, and the Vector Error Correction Model (VECM). The results indicate that all variables are integrated of order one, I(1), and the Johansen tests confirm the existence of a long-run equilibrium relationship among the variables. The long-run estimates reveal that national savings positively influence capital formation, whereas the exchange rate has a significant effect on investment. Industrial performance demonstrates a statistically significant long-run association with capital formation, while inflation and bank credit to the private sector do not exhibit statistically significant long-run effects. The error correction term is negative and statistically significant, indicating that approximately 70.4% of short-run disequilibrium is corrected annually. Impulse response analysis suggests that shocks to national savings and industrial performance support capital accumulation over time. The findings underscore the importance of strengthening financial intermediation, mobilising domestic savings, promoting industrial development, and maintaining macroeconomic stability to achieve sustainable capital formation and long-term economic growth in Pakistan.

Monetary Policy Tightening, and Banking Concentration: Structural Evidence from an Emerging Economy

This paper analyses the short-run dynamic relationship between monetary policy and banking market structure in Colombia during a period of post-pandemic inflation and aggressive policy tightening. Using monthly credit portfolio data for 2017–2024, we compute several concentration indicators (the Herfindahl–Hirschman Index (HHI), CRk ratios, and a dominance index) and employ three complementary identification strategies to evaluate the causal effect of monetary policy innovations on banking concentration. First, a structural VAR model identified through sign restrictions finds that contractionary shocks are associated with a short-run increase in banking concentration (median peak response: +0.60 HHI points at h = 3; 90% credible set: [+0.12, +1.16]), contrasting with the negative short-run response obtained under recursive reduced-form identification. Second, an extended VAR including credit portfolio growth as a mechanism variable confirms that contractionary shocks compress aggregate lending but do not generate robust, persistent changes in concentration. Third, local projections with regime-interaction terms formally test the nonlinear mechanisms discussed in the literature and find evidence of state-dependent transmission: the concentration response is larger in the low-inflation regime and attenuates during high-inflation episodes. All estimated effects are transitory and horizon-sensitive, reinforcing a cautious interpretation. The paper contributes new evidence from an emerging economy on the structural consequences of monetary policy and highlights the importance of identification assumptions in determining the direction of this effect.

Trade, Finance and Economic Growth in Nigeria

This study examines the impact of trade and financial indicators on economic growth in Nigeria from 1986 to 2023, a period marked by major trade liberalization efforts, financial sector reforms, and repeated macroeconomic shocks. Against the backdrop of Nigeria’s persistent struggle to convert openness and financial deepening into sustained economic progress, the research investigates the distinct effects of key macroeconomic variables—trade openness, trade balance, exchange rate, and inflation rate—on GDP growth. Employing an ex-post facto research design and utilizing secondary time-series data, the study applied the Autoregressive Distributed Lag (ARDL) bounds testing approach to cointegration and error correction modeling. The empirical findings reveal a structurally imbalanced trade–finance–growth relationship: trade openness exhibits a positive but statistically insignificant long-run effect on economic growth, highlighting the weakness of Nigeria’s export base and the limited productivity gains from openness. Similarly, trade balance demonstrates a positive yet insignificant long-run influence, reflecting a persistent disconnect between external sector performance and real-sector expansion. In contrast, the exchange rate shows a positive and statistically significant long-run impact, underscoring the critical role of exchange-rate stability in shaping economic outcomes. Inflation rate, however, exerts a negative and significant long run effect, confirming its destabilizing influence on investment, purchasing power, and output performance. The study concludes that Nigeria’s growth trajectory is constrained by a dual structural imbalance where trade variables fail to transmit their expected benefits, while financial conditions—especially inflation and exchange-rate dynamics—drive macroeconomic performance. It therefore recommends policy actions focused on strengthening export competitiveness, improving the trade environment, stabilizing the exchange rate, and implementing coordinated inflation-management strategies to align trade and financial policies with sustainable economic growth objectives.

Money Supply and Economic Growth

This study investigates the impact of key monetary policy variables on economic growth in Nigeria from 1982 to 2023, a period characterized by recurring inflationary pressures, exchange-rate instability, monetary regime shifts, and persistent macroeconomic imbalances. Against the backdrop of Nigeria’s long-standing struggle to achieve stable and sustainable output growth despite extensive monetary interventions, the research examines the distinct effects of broad money supply (M2), inflation rate (INFR), and interest rate (INTR) on real GDP growth. Employing an ex-post facto research design and annual secondary time-series data, the study utilizes the Autoregressive Distributed Lag (ARDL) bounds testing technique to explore both the long-run and short-run dynamics among the variables. The empirical findings reveal that broad money supply exerts a positive and statistically significant long-run effect on economic growth, indicating that liquidity expansion continues to play a central role in stimulating investment, credit creation, and aggregate demand in Nigeria. Conversely, inflation rate exhibits a positive but statistically insignificant relationship with growth, suggesting that price movements—driven largely by structural and imported inflation—have not been a primary determinant of long-run output fluctuations. Interest rate displays a negative but statistically insignificant long-run effect, reflecting the weak interest-rate transmission mechanism within Nigeria’s shallow financial markets and the limited responsiveness of real sector activities to lending conditions. The study concludes that while money supply serves as an important driver of long-run economic performance in Nigeria, both inflation and interest rate remain weak instruments for influencing growth due to structural rigidities, financial market limitations, and institutional inefficiencies. It therefore recommends policies aimed at improving monetary policy transmission, stabilizing the inflation environment, deepening financial market development, and strengthening credit allocation frameworks to ensure that monetary interventions translate effectively into sustained economic growth.