Publications

La plupart des informations présentées ci-dessous ont été récupérées via RePEc avec l'aimable autorisation de Christian Zimmermann
Monetary Policy and the Top 1%: Evidence from a Century of Modern Economic HistoryJournal articleMehdi El Herradi et Aurelien Leroy, International Journal of Central Banking, Volume 18, Issue 5, pp. 237-277, 2021

This paper examines the distributional effects of monetary policy in 12 OECD economies between 1920 and 2016. We exploit the implications of the macroeconomic policy trilemma with an external instrument approach to analyze how top income shares respond to monetary policy shocks. The results indicate that monetary tightening strongly decreases the share of national income held by the top 1 percent and vice versa for a monetary expansion, irrespective of the position of the economy. This effect (i) holds for the top percentile and the ultrarich (top 0.1 percent and 0.01 percent income shares), while (ii) it does not necessarily induce a decrease in income inequality when considering the entire income distribution. Our findings also suggest that the effect of monetary policy on top income shares is likely to be channeled via real asset returns.

The effect of international accreditations on students’ revealed preferences: Evidence from French Business schoolsJournal articleJulien Jacqmin et Mathieu Lefebvre, Economics of Education Review, Volume 85, pp. 102192, 2021

This paper evaluates how three different international accreditations for business schools (AACSB, EQUIS and AMBA) affect student preferences, expressed via enrollment decisions. Focusing on the French context, we build a relative preference indicator to compare schools using data collected by the central clearinghouse that allocates students to schools. We observe that all three accreditations positively and significantly influence students, but that the impact of the AACSB accreditation is larger than the other two accreditations. Having an AACSB accreditation is equivalent to moving up four places in rankings by L’étudiant magazine, whereas the impact of having EQUIS or AMBA is similar to moving up two places. We also find a sizeable “triple crown” effect, meaning that the three accreditations tend to complement each other. Our results are robust to different ways of assessing potential self-selection into accreditation.

Vers une couverture sanitaire universelle au Sénégal : quelles sont les meilleures stratégies de financement ?Journal articleSameera Awawda, Mohammad Abu-Zaineh et Bruno Ventelou, Revue internationale des études du développement, Volume 247, Issue 3, pp. 37-60, 2021

Cette étude a pour objectif d’évaluer différents modes de financement de la couverture santé universelle au Sénégal. La méthode utilisée, la micro-simulation, permet d’examiner l’impact de différents scenarii sur les consommations des ménages ainsi que sur les dépenses publiques. Les résultats montrent que la généralisation d’une assurance-maladie à l’ensemble de la population, associée à une réduction des coûts directs des soins, augmenterait les consommations de soins des Sénégalais, améliorant donc leur accès aux services de santé. Néanmoins, une telle généralisation serait coûteuse pour les finances publiques. Pour limiter les coûts supportés par le gouvernement, l’augmentation du taux d’imposition sur la consommation et de la prime de contribution à l’assurance-maladie serait utile et permettrait de ramener les finances publiques à l’équilibre.

Comment les migrations affectent-elles la mortalité infanto-juvénile en zone rurale ? L’exemple de Niakhar, SénégalJournal articleUlrich Nguemdjo et Bruno Ventelou, Population, Volume 76, Issue 2, pp. 359-387, 2021

Explorant les riches données longitudinales fournies par l’Observatoire de santé et de population de Niakhar, cette étude examine les effets des migrations sur la mortalité infanto-juvénile dans les familles rurales restées au village. Les migrations, en particulier de courte durée, sont associées de manière positive aux chances de survie des enfants de moins de cinq ans au sein du ménage. On constate également que les déplacements de courte durée des femmes d’âge actif ont plus d’incidences sur la mortalité des enfants que ceux de leurs homologues masculins. De surcroît, des effets croisés sont identifiés entre ménages de la même concession, ce qui est conforme à l’idée que les familles rurales africaines partagent les gains de l’émigration avec une communauté étendue de voisins. Enfin, l’effet des migrations maternelles de courte durée sur la survie des enfants de moins de cinq ans demeure globalement positif, mais nettement plus modeste. L’émigration de la mère, en particulier pendant la grossesse, semble améliorer la probabilité de survie des enfants juste après la naissance, mais celle-ci tend à diminuer après l’âge d’un an et lorsque la mère est absente.

Sibling status, home birth, tattoos and stitches are risk factors for chronic hepatitis B virus infection in Senegalese children: A cross-sectional surveyJournal articleLauren Perieres, Camelia Protopopescu, Gora Lo, Fabienne Marcellin, El Hadji Ba, Marion Coste, Coumba Toure Kane, Aldiouma Diallo, Cheikh Sokhna, Sylvie Boyer, et al., Journal of Viral Hepatitis, Volume 28, Issue 11, pp. 1515-1525, 2021

Sub-Saharan Africa's hepatitis B virus (HBV) burden is primarily due to infection in infancy. However, data on chronic HBV infection prevalence and associated risk factors in children born post-HBV vaccination introduction are scarce. We estimated hepatitis B surface antigen (HBsAg) prevalence and risk factors in Senegalese children born during the HBV vaccination era. In 2018–2019, a community-based cross-sectional survey was conducted in Senegal among children born between 2004 and 2015 (ie after the three-dose HBV vaccine series was introduced (2004) but before the birth dose's introduction (2016)). HBsAg-positive children were identified using dried blood spots. A standardized questionnaire collected socioeconomic information. Data were age-sex weighted and calibrated to be representative of children living in the study area. Risk factors associated with HBsAg positivity were identified using negative binomial regression. Among 1,327 children, 17 were HBsAg-positive (prevalence = 1.23% (95% confidence interval [CI] 0.61–1.85)). Older age (adjusted incidence-rate ratio [aIRR] 1.31 per one-year increase, 95% CI 1.10–1.57), home vs healthcare facility delivery (aIRR 3.55, 95% CI 1.39–9.02), stitches (lifetime) (aIRR 4.79; 95% CI 1.84–12.39), tattoos (aIRR 8.97, 95% CI 1.01–79.11) and having an HBsAg-positive sibling with the same mother (aIRR 3.05, 95% CI 1.09–8.57) were all independently associated with HBsAg positivity. The low HBsAg prevalence highlights the success of the Senegalese HBV vaccination program. To further reduce HBV acquisition in children, high-risk groups, including pregnant women and siblings of HBsAg-positive individuals, must be screened. Vital HBV infection prevention measures include promoting delivery in healthcare facilities, and increasing awareness of prevention and control procedures.

Regional Differences in COVID-19 Vaccine Hesitancy in December 2020: A Natural Experiment in the French Working-Age PopulationJournal articleFanny Velardo, Verity Watson, Pierre Arwidson, François Alla, Stéphane Luchini, Michael Schwarzinger et CoVaMax Study Group, Vaccines, Volume 9, Issue 11, pp. 1364, 2021

It can be assumed that higher SARS-CoV-2 infection risk is associated with higher COVID-19 vaccination intentions, although evidence is scarce. In this large and representative survey of 6007 adults aged 18–64 years and residing in France, 8.1% (95% CI, 7.5–8.8) reported a prior SARS-CoV-2 infection in December 2020, with regional variations according to an East–West gradient (p < 0.0001). In participants without prior SARS-CoV-2 infection, COVID-19 vaccine hesitancy was substantial, including 41.3% (95% CI, 39.8–42.8) outright refusal of COVID-19 vaccination. Taking into account five characteristics of the first approved vaccines (efficacy, duration of immunity, safety, country of the vaccine manufacturer, and place of administration) as well as the initial setting of the mass vaccination campaign in France, COVID-19 vaccine acceptance would reach 43.6% (95% CI, 43.0–44.1) at best among working-age adults without prior SARS-CoV-2 infection. COVID-19 vaccine acceptance was primarily driven by vaccine characteristics, sociodemographic and attitudinal factors. Considering the region of residency as a proxy of the likelihood of getting infected, our study findings do not support the assumption that SARS-CoV-2 infection risk is associated with COVID-19 vaccine acceptance.

Evidence-based policymaking when evidence is incomplete: The case of HIV programme integrationJournal articleJan A. C. Hontelez, Caroline A. Bulstra, Anna Yakusik, Erik Lamontagne, Till W. Bärnighausen et Rifat Atun, PLOS Medicine, Volume 18, Issue 11, pp. e1003835, 2021

Jan Hontelez and co-authors discuss the use of different types of evidence to inform HIV program integration.

Economic Aspects of Settlement in the Oasis of Bukhara, Uzbekistan: An Archaeo-Economic ApproachJournal articleRocco Rante et Federico Trionfetti, Cambridge Archaeological Journal, Volume 31, Issue 4, pp. 581-596, 2021

This paper focuses on the new approach studying variations in city size and the impact that the Silk Road had on the structure of cities, demonstrated through the study of economic aspects of the Bukhara oasis. We use archaeological data, compare the ancient economy to modern ones, use modern economic theory and methods to understand ancient society, and use what we have learned about the ancient economy to understand modern economies better. In sum, we explore the past through the present and the latter through the former. Our main finding is the generation of models able to answer to the city-size distribution in different territories, comparing them between the past and the present. This study first revealed that, through Zipf's Law, we found similarities between modern post-Industrial Revolution and medieval economics. Secondly, we also found that in ancient times the structure of the city was linked with the local economic demand. We have demonstrated this through the study of cities along the Silk Road.

Transitory and permanent shocks in the global market for crude oilJournal articleNooman Rebei et Rashid Sbia, Journal of Applied Econometrics, Volume 36, Issue 7, pp. 1047-1064, 2021

This paper documents the determinants of real oil price in the global market based on an empirical model embedding transitory and permanent shocks. We find evidence of significant differences in the propagation mechanisms of transitory versus permanent disturbances, pointing to the importance of disentangling their distinct effects. Permanent supply shocks are found to be very influential in driving oil price fluctuations.

Pollution and growth: The role of pension in the efficiency of health and environmental policiesJournal articleArmel Ngami et Thomas Seegmuller, International Journal of Economic Theory, Volume 17, Issue 4, pp. 390-415, 2021

This paper analyzes the effect of a pay-as-you-go pension system on the evolution of capital and pollution, and on the efficiency of an environmental versus health policy. In an overlapping generations model, we introduce endogenous longevity that depends on pollution and health expenditures. Global dynamics may display multiple balanced growth paths (BGPs). We show that by discouraging savings, a policy that promotes the pension system enlarges the environmental poverty trap. More surprisingly, the environmental policy has contrasting effects according to the significance of the pension system. If it has a small size, a more environmentally-friendly policy enlarges the environmental poverty trap and leads to a rise in capital over pollution at the highest stationary equilibrium. In contrast, in economies where intergenerational solidarity is well developed, capital over pollution decreases at the highest BGP. In such a case, the environmental policy does not necessarily lead to a better longevity and growth.