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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.

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 use two banking sector development indices and apply a panel bootstrap approach to Granger causality testing which takes into account cross-sectional dependence and heterogeneity issues. The empirical results show limited support for the supply-leading, demand-following and complementarity hypotheses, but provide evidence for a causal relationship between banking sector development and economic growth in twenty-five countries.

The article is an extension to the pricing models proposed by Jean Tirol that model the consumption of an environmental good. However, the different consumption patterns of this good, which is characterized by a taste parameter (two tastes or a continuum of taste); always verifying an imbalance between the profit of the monopoly (mainly natural); and the utility function of the consumer agent. Taxation on the price, in relation to consumer preferences, can ensure the objectives of an efficient management of a good which has variations in its physical nature. Moreover, a coefficient of variation in its nature, based on a scale of measurement, can achieve the convergence between economic and social objectives. The underlying results show that the consumer surplus is proportional to the variation between the average and marginal utility. In addition, maximizing monopoly profit provides a reasonable price that ensures social equity measures between the different users.

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 paper aims to estimate a willingness to pay (WTP) model from a Logit and Tobit regressions. The purpose of these estimates is to study the behavior of Tunisian consumers following their consumption of drinking water by calculating the marginal and elasticities’ effects. Empirical results show that the differentiation intra and inter-physical nature of the quality of water supplied to a major consequence to cause reactions in the strategy for consumer consumption. Indeed, in case of poor or average quality households are paying nearly a WTP to benefit from improved quality. In case where the drinking water’s quality is not a problem of satisfaction among households, the payment of WTP will depend on the awareness’s level of the questioned agent. Therefore, households those who recognize the scarcity are paying nearly.