The purpose of this paper is to revisit the Granger causal relationship between banking sector development and economic growth for forty developing countries in the period 1970-2012. In order to capture the different aspects of banking sector development, we develop two banking sector development indices and apply the panel bootstrapped approach to Granger causality testing approach properly taking into account cross-sectional dependence and heterogeneity issues. The empirical results show limited support for the supply-leading, demand-following and complementarity hypotheses. Our results also provide evidence as the causal relationship between banking sector development and economic growth exists in twenty five countries.

Tax policy is among the most common and relevant instruments in the toolkit of policy-makers when thinking about promoting growth, yet there is not compelling evidence regarding its effect in Tunisia. Using a variety of approaches, we measure firstly the optimal tax burden rate using Scully's static model and the quadratic model. For Scully's static model, gross domestic product is the dependent variable. For the quadratic model, growth rate is a dependent variable explained by tax rate in level and in square. Secondly and according to stationary and cointegration test results, we focus on the long-term effects on gross domestic product of the important taxes, namely tax revenue and private receipts. In this second study, we use a basic Scully model and we develop a vector error correction model technique. Our results show that optimal tax burden rate has to be situated between 12.8% and 19.6% of gross domestic product which is widely lower than the current rates. The long-term analysis estimates an optimal rate of 14% of gross domestic product which can participate to increase economic growth, to stabilize the tax evasion and to encourage investment especially after the Tunisian revolution.

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This paper tracks the financial growth in Tunisia over the period 1984–2016 with a special focus on the shadow economy. Using Tanzi's measures, we worked on a nonlinear autoregressive distributed lag (NARDL) model to test the impact of the informal economy. The results suggest that the long‐run effect of the financial growth becomes negative if there is a positive change in the shadow economy and the opposite holds. While changes in the shadow economy have no significant influence on the links between financial development and economic growth in the short run, they play a significant role in the Tunisian economy in the long run.

The object of this paper is to study the theory of the finance and the Islamic banks through their concepts and logics of functioning. We focus on the analysis of the banking performances, in particular in terms of profitability which has a big interest to allow the banks to arrest the factors which act on their profitability and of offering them so better control levers of action, control and forecast. What requires a definition of the internal and external determiners of the profitability of Islamic banks? We suggest approaching this question from the specification and from the estimation of a model which integrates at once organizational, exogenous and macro-financial measurable aspects. The empirical analysis was focused on the determiners of the Islamic banking performance. Our study which concerned 10 Islamic banks in 10 various countries showed essentially that the profitability of asset constitutes the main explanatory variable of the banking performance. The performance is positively correlated with CTA and negatively with ASITA. Concerning the externals factors, the profitability is weakly explained by the rates of inflation and growth.

This study aimed to assess the effect of the shadow economy on the finance-growth relationship in Tunisia over the period 1984-2020. The authors used a nonlinear autoregressive distributed lags (NARDL) model to verify the impact of the informal economy as measured by Tanzi's method on the finance-growth relationship. The results suggest that in the long term, with a positive change at the level of the shadow economy, the effect of financial development on growth becomes negative. The opposite is also true. However, in the short run, asymmetric effect of the shadow economy is only detected on economic growth and not on the financial development-economic growth nexus. Indeed, the level of the informal economy has an important role in the Tunisian economy. The significant and positive impact of financial development on the economy is strongly influenced by the size of the informal economy.

This paper studies the behaviour of the Tunisian consumer face their consumption of drinking water. The application of the contingent valuation method (CVM) from a statistical survey allows us not only to analyse the function of the demand for the drinkable water but also to determine the willingness to pay (WTP) of households. The creation of a hypothetical market enables us to carry out a program of improvement in the quality of the potable water and to ensure the follow-up of a sustainable management of the resource. The variation in the WTP is mainly due to the introduction of the variables that are related to the characteristics of the property and the socio-economic characteristics of the households. The results show that the household's WTP varies according to the nature of the physical quality of water and also to other variables such as income, housing occupancy, and the educational level of the respondents.