Publications

Abstract We compare how the long-run distribution of fishing activities is affected in multispecies fisheries when facing different second-best control rules: (1) species-specific landing regulation, and (2) global input regulation. We show how this depends on the economic returns and on the type of ecological interaction considered. We highlight specifically that fishing effort does not necessarily increase on nontargeted species and decrease on targeted species, and that the characterization of second-best efficient instruments may differ drastically depending on the nature of the interaction.
Keywords Multispecies fisheries, Second-best management, Bioeconomic models, Fishing, Effort distribution, Biological interactions, Pêcherie, Bioéconomie
Publication HAL Google Scholar
Abstract This paper revisits the optimal population size problem in a continuous time Ramsey setting with costly child rearing and both intergenerational and intertemporal altruism. The social welfare functions considered range from the Millian to the Benthamite. When population growth is endogenized, the associated optimal control problem involves an endogenous effective discount rate depending on past and current population growth rates, which makes preferences intertemporally dependent. We tackle this problem by using an appropriate maximum principle. Then we study the stationary solutions (balanced growth paths) and show the existence of two admissible solutions except in the Millian case. We prove that only one is optimal. Comparative statics and transitional dynamics are numerically derived in the general case.
Publication HAL Google Scholar
Abstract Avoiding to assign emerging market countries a ‘typical’ behaviour, this article considers the heterogeneity across them and through time to predict their sovereign default episodes. Moreover, it focuses on the imbalance between defaulted debt and GDP. For the first time, we use a panel nonlinear regime-switching model whose explanatory factors have a different impact on sovereign default, depending on the regime the country belongs to. We mitigate some common views of the literature (in particular the ‘serial default’ theory) and identify countries deserving to be monitored carefully, because of a higher exposure to sovereign default risk.
Keywords Vulnerability regimes, Emerging countries, PSTR model, Sovereign debt
Publication HAL Google Scholar
Abstract In 2002, the Israeli government decided to build a wall inside the occupied West Bank. The wall had a marked effect on the access to land and water resources as well as to the Israeli labour market. It is difficult to include the effect of the wall in an econometric model explaining poverty dynamics as the wall was built in the richer region of the West Bank. So a diff-in-diff strategy is needed. Using a Bayesian approach, we treat our two-period repeated cross-section data set as an incomplete data problem, explaining the income-to-needs ratio as a function of time invariant exogenous variables. This allows us to provide inference results on poverty dynamics. We then build a conditional regression model including a wall variable and state dependence to see how the wall modified the initial results on poverty dynamics. We find that the wall has increased the probability of poverty persistence by 58 percentage points and the probability of poverty entry by 18 percentage points.
Keywords Bayesian inference, Pseudo panels, Data augmentation, Walls, Poverty dynamics
Publication HAL Google Scholar
Abstract We document strong and robust negative correlations between the length of the title of an economics article and different measures of scientific quality. Analyzing all articles published between 1970 and 2011 and referenced in EconLit, we find that articles with shorter titles tend to be published in better journals, to be more cited and to be more innovative. These correlations hold controlling for unobserved time-invariant and observed time varying characteristics of teams of authors. (C) 2018 Elsevier B.V. All rights reserved.
Keywords Novelty, Citations, Journal quality, Title length
Publication HAL Google Scholar