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The paper validates the threshold argument in the informality–poverty nexus. Recent literature and policy have argued the existence of a threshold in the relationship.

The study adopts dynamic panel threshold analysis, estimated within the framework of system Generalized Method of Moments (SGMM) to control for endogeneity and simultaneity. Data from 40 selected sub-Saharan African countries between 1991 and 2018 are used for the study.

Empirical results confirm the existence of an average threshold of 31% share of informality in GDP. Also, the paper finds that threshold of informality that addresses mild and severe poverty varies between 24.32 and 36.75%.

The work is limited to African economies. Evidence from other emerging and developed economies is suggested for further research.

Overall, the empirical results indicate a threshold in the informality–poverty nexus. Therefore, an excessive informality level does not benefit the African growth process. Policymakers and governments are advised to operate within the bounds of the threshold of informality that reduces poverty and improve the African economic growth process.

The paper is the first study to provide empirical findings on the nonlinear and threshold argument in the informality–poverty nexus, as far as the authors know.

This paper aims to investigate the effect of corruption on bank profitability.

The paper adopts panel cointegration, differenced generalized method of moments (GMM) and system GMM.

The empirical results show that corruption is important in explaining the profitability of commercial banks in both developed and emerging countries. While it has mixed effects in emerging countries, only positive effect is validated in developed countries.

Macroeconomic measures of corruption are adopted in the study.

The paper contributes to the literature on corruption and bank profitability by reporting evidence from both developed and developing countries. Existing papers have only concentrated on developing countries.

The paper investigates the determinants of capital structure and the speed of adjustment of capital structure decisions of Nigerian firms.

The paper adopts three methods: difference GMM, system GMM and stochastic frontier analysis (SFA).

The empirical results show that firms' efficiency affects the capital structure decisions of Nigerian firms. At the same time, short-term debt has a higher speed of adjustment in the context of Nigerian firms. The roles of other control variables are established in the paper.

Nigerian firms should adopt short-term debt in order to achieve their targeted debt levels. Managers of Nigerian firms are also advised to be more efficient in order to attract higher performance.

The paper is the first literature to measure the efficiency of firms using SFA method. Extant studies in the literature have neglected the determinant while four papers that adopt the determinant data envelope analysis (DEA) method. This is also the first study to document the speed of adjustment in capital structure decisions in the context of Nigerian firms.

The paper examines whether there is a threshold between financial development and poverty in African economies.

The study adopts the innovative dynamic panel threshold model of Seo and Shin (2016) made practicable by Seo et al. (2019)–the model estimates threshold relationship even in the presence of endogeneity. Also, following the recommendations of Cihak et al. (2013) and Sahay et al. (2015), we also adopt a robust measure of financial development based on the four pillars of financial deepening, stability, efficiency and access derived from the principal component analysis (PCA).

The empirical results show that there exists a threshold level of financial development necessary for poverty reduction in Africa.

Our result is important for policy formulations. First, individual African country must discover the level of financial development necessary for spurring poverty reduction. Second, policymakers, especially in lower-income countries, must keep improving their financial sector development to achieve the threshold level necessary for achieving poverty reduction even though financial development might seem less relevant at its present level.

The policymakers in Africa should note that there exists a threshold level of financial development that reduces poverty. Hence, the present level of financial development might have not yielded a considerate effect on poverty. Still, the policymakers must keep pushing on until the threshold is achieved.

Financial development reduces poverty level but it must reach a certain threshold level before it does so. So, we advise African policymakers to continue to develop their financial sector to achieve this threshold.

This seems to be the first work to document the threshold relationship using the dynamic panel threshold. Besides, the study specifically concentrates on Africa dividing the continent into different income levels. Moreover, we adopt a robust measure of financial development unlike extant studies on Africa.

The paper contributes to the literature on investment and poverty in sub-Saharan Africa (SSA). Specifically, the study examined the separate role of private and public investment in poverty reduction in a panel of 40 sub-Saharan African countries.

For robustness, the study adopts a variety of estimation techniques. These include the fixed effect (within) regression model, the two-step system generalised method of moments (GMM) and the pooled OLS with Driscoll-Kraay robust standard errors to account for the well-known problems of endogeneity, heterogeneity and cross-sectional dependence inherent in panel data.

The empirical results show that the reducing impact of public investment on poverty is marginal, while private investment has a significant reducing impact on poverty. The study also found that access to social services, such as water and sanitation, and credit are important determinants of investment in SSA. The research and policy implications are discussed.

The study investigated the separate effect of private and public investments on poverty in SSA, unlike the existing studies that adopted total investment.

The purpose of this paper is to re-examine the determinants of bank profitability in Nigeria. Specifically, the study investigates the effect of managerial cost efficiency on bank profitability. Also, since there exist mixed results and controversies in the literature, in both developed and developing countries, regarding the effect of efficiency on bank profitability, this study employs the standard measure of efficiency. In addition, the work incorporates the role of persistence, which is often neglected in the literature in developing countries.

This study employs system generalized method of moments.

The findings, using the case of Nigeria, show that cost efficiency is a strong determinant of bank profitability in developing countries. In addition, the profitability of banks in Nigeria persists over time; hence, the industry is fairly competitive.

The recent policies of banking industry recapitalization meant to increase profitability and stability in Nigeria and other African countries’ banking industry will not be effective if the issue of managerial efficiency is not properly addressed.

Improving the banking managerial efficiency will positively reduce bad loans, hence leading to the stability in the banking system.

The authors introduce efficiency using standard measure of stochastic frontier analysis for its measurement. Also, this study introduces the role of persistence in the literature in developing countries.