Charles Vellutini
ECOPA contributed four chapters to this Word Bank book on risk-based tax audits (2011).

"Risk-Based Tax Audits brings together first-hand country experiences of how various tax administrations have undertaken reforms to implement risk-based audit systems. It evaluates their success while examining the fundamental principles of risk-based audits, the behavioral aspects of tax compliance, and the institutional challenges they present. Drawing from contributions by tax administrators and international experts, the book also serves as a resource for analytical techniques used in risk-based audit strategies."

See World Bank website: "Risk-Based Tax Audits"

Antoine Belgodere, Charles Vellutini
Applied Economics Letters, 2011, 1–4, iFirst

This article presents a simple Monte Carlo (MC) procedure to improve sensitivity analysis in Computable general equilibrium (CGE) modelling. MC experiments provide the modeller with a population of randomly drawn exogenous parameters and corresponding endogenous outcomes. Standard econometrics can then shed light on the relationship between them and help to identify key parameters, particularly key elasticities.

Philippe Marcoul, Luc Veyssiere
American journal of agricultural economics 2010, vol. 92, no4, pp. 1051-1064

Traditional moneylenders monitor farmers to ensure that their investment is not diverted. Modern farming contracts offered by supermarkets in developing countries often entail a loan component, and monitoring arises as well. However, unlike moneylenders, supermarkets do care about the attributes of the product. Whether such attributes are obtained is influenced largely by the advice and the extension services received by farmers. We build a financial contracting model where we show that supermarkets optimally undertake both the monitoring and the advisory missions. This contract is shown to potentially enhance credit access for small farmers but sometimes also involves excessive monitoring.

Marie-Antoinette Maupertuis, Charles Vellutini
Revue d'Economie Rurale et Urbaine, Number 5, 2009

La première matrice de comptabilité sociale (MCS) pour la Corse est présentée pour l’année 2003. La MCS décrit dans un cadre macro-économique la structure de l’économie insulaire, y compris un tableau des achats intermédiaires sur cinq secteurs, une balance des paiements et les principaux flux économiques entre la Corse, le Reste de la France (RdF), le Reste du Monde (RdM), l’État et les collectivités locales. Cette présentation permet une lecture immédiate des principaux agrégats macro-économiques et de leurs relations. La MCS montre que le déficit commercial, bien que limité grâce à l’importante contribution du tourisme, reste élevé, à 20 % du PIB. Elle montre aussi que ce déficit est principalement financé par des transferts nets en provenance du RdF. La MCS fournit aux analystes un fondement empirique pour une modélisation appliquée de l’économie corse. En particulier, la MCS rend possible le calibrage d’un modèle d’équilibre général pour la Corse.

Georges Casamatta, Charles Vellutini
Journal of Development Economics, Volume 87, Issue 2, October 2008, Pages 322-332

Using a model of probabilistic voting, we analyse the impact of aid on the political equilibrium of a recipient country or region. We consider politicians with mixed motives, interested in promoting social welfare but also valuing the benefits of holding office. We label as clientelistic the politician who most values the benefits of power. Using utilitarian social welfare as a benchmark, we conclude that the impact of aid on the political equilibrium and so quality of policy in the recipient country depends on the value of the elasticity of marginal consumption. When elasticity is low, the expected policy outcome moves further from the socially desirable policy set. This substitution of policy quality for aid can help to explain the poor performance of conditionality in improving policy. Perhaps more surprising is the opposite case, which arises for high values of elasticity of marginal utility: an increase in aid tilts the equilibrium policy towards the welfare-maximizing policy set.