Publications

La plupart des informations présentées ci-dessous ont été récupérées via RePEc avec l'aimable autorisation de Christian Zimmermann
Child Development in Parent-Child InteractionsJournal articleAvner Seror, Journal of Political Economy, Volume 130, Issue 9, pp. 2462-2499, 2022

I present a model of child development that highlights the effect of parent-child interactions on the formation of skills. Through the parent’s affection, the child learns and builds mental representations of the self as loved and competent. These mental representations shape the child’s noncognitive skills and foster learning. I show that this model provides a unifying explanation for well-established evidence on child development. The model also sheds light on how early exposure to media devices can negatively impact skill acquisition. I discuss implications for the design of policies to reduce inequalities in child development.

A new regularization of equilibrium problems on Hadamard manifolds: Applications to theories of desiresJournal articleG. C. Bento, J.X. Cruz Neto, Jr. P. A. Soares et Antoine Soubeyran, Annals of Operations Research, Volume 316, Issue 2, pp. 1301-1318, 2022

In this paper, we introduce a new proximal algorithm for equilibrium problems on a genuine Hadamard manifold, using a new regularization term. We first extend recent existence results by considering pseudomonotone bifunctions and a weaker sufficient condition than the coercivity assumption. Then, we consider the convergence of this proximal-like algorithm which can be applied to genuinely Hadamard manifolds and not only to specific ones, as in the recent literature. A striking point is that our new regularization term have a clear interpretation in a recent “variational rationality” approach of human behavior. It represents the resistance to change aspects of such human dynamics driven by motivation to change aspects. This allows us to give an application to the theories of desires, showing how an agent must escape to a succession of temporary traps to be able to reach, at the end, his desires.

Pareto solutions as limits of collective traps: an inexact multiobjective proximal point algorithmJournal articleG. C. Bento, J. X. Cruz Neto, L. V. Meireles et Antoine Soubeyran, Annals of Operations Research, Volume 316, Issue 2, pp. 1425-1443, 2022

In this paper we introduce a definition of approximate Pareto efficient solution as well as a necessary condition for such solutions in the multiobjective setting on Riemannian manifolds. We also propose an inexact proximal point method for nonsmooth multiobjective optimization in the Riemannian context by using the notion of approximate solution. The main convergence result ensures that each cluster point (if any) of any sequence generated by the method is a Pareto critical point. Furthermore, when the problem is convex on a Hadamard manifold, full convergence of the method for a weak Pareto efficient solution is obtained. As an application, we show how a Pareto critical point can be reached as a limit of traps in the context of the variational rationality approach of stay and change human dynamics.

Trade barriers in government procurementJournal articleAlen Mulabdic et Lorenzo Rotunno, European Economic Review, Volume 148, pp. 104204, 2022

This paper estimates trade barriers in government procurement, a market that accounts for 12 percent of world GDP. Using data from inter-country input–output tables in a gravity model, we find that home bias in government procurement is significantly higher than in trade between firms. However, this difference has decreased over time. Results also show that trade agreements with provisions on government procurement increase cross-border flows of services, whereas the effect on goods is small and not different from that in private markets. Provisions on transparency and procedural requirements are particularly instrumental in increasing cross-border government procurement.

The inverted leading indicator property and redistribution effect of the interest rateJournal articlePatrick A. Pintus, Yi Wen et Xiaochuan Xing, European Economic Review, Volume 148, pp. 104219, 2022

The interest rate at which US firms borrow funds has two features: (i) it moves in a countercyclical fashion and (ii) it is an inverted leading indicator of real economic activity: low interest rates today forecast future booms in GDP, consumption, investment, and employment. We show that a Kiyotaki–Moore model accounts for both properties when interest-rate movements are driven, in a significant way, by self-fulfilling belief shocks that redistribute income away from lenders and to borrowers during booms. The credit-based nature of such self-fulfilling equilibria is shown to be essential: the dynamic correlation between current loanable funds rate and future aggregate economic activity depends critically on the property that the interest rate is state-contingent. Bayesian estimation of our benchmark DSGE model on US data shows that the model driven by redistribution shocks results in a better fit to the data than both standard RBC models and Kiyotaki–Moore type models with unique equilibrium.

Are preferences for work reference dependent or time nonseparable? New experimental evidenceJournal articleSam Cosaert, Mathieu Lefebvre et Ludivine Martin, European Economic Review, Volume 148, pp. 104206, 2022

Tests of labor supply models often rely on wages. However, wage variation alone generally cannot disentangle the classical time separable model and its extensions: reference dependent preferences (income targeting) and time nonseparable preferences (disutility spillovers; timing-specific preferences). We set up a novel laboratory experiment in which individuals choose their working time. We vary, independently, wages, historical income paths, and cumulative past work. We also vary the timing of experimental sessions. Statistical tests and stochastic revealed preference methods cannot reject the classical model in favor of income targeting or disutility spillovers, but the data suggest that labor supply varies by time-of-the-day.

De l’entreprise libérée à l’entreprise libérante. Essai critique et clinique sur les transformations managérialesJournal articleArnaud Lacan et Michel Dalmas, Management & Avenir, Volume 130, Issue 4, pp. 41-63, 2022

L’entreprise libérée est souvent présentée comme une innovation managériale et un modèle organisationnel d’avenir. Pourtant, même si elle est une tentative de réponse intéressante aux problématiques de déplacement des attentes des collaborateurs au travail, il faut s’interroger sur la véritable nature de cette réponse : véritable concept managérial ou appellation acceptée faute de mieux ? Nous formulons dans cet essai d’abord une critique de l’entreprise libérée avant de proposer une révision conceptuelle à l’aide de l’éclairage postmoderne et en introduisant la notion d’entreprise libérante. Nous suggérons ainsi une nouvelle piste en cherchant à repenser les grandes postures managériales. Nous proposons donc de cesser de vouloir « libérer » l’entreprise pour poser les bases de l’entreprise « libérante », en déplaçant notre réflexion sur les salariés. Ce travail de rénovation conceptuelle s’appuie sur une étude exploratoire qualitative menée auprès de managers « libérateurs » dans des organisations qui se sont autoproclamées « entreprises libérées ». Puis nous étendons les conclusions de cette étude à des pistes de postures managériales au service de collaborateurs libérés, nouvelles postures managériales d’autant plus importantes qu’elles se situent désormais dans un monde de travail hybride post-covid.

Murder nature: Weather and violent crime in rural BrazilJournal articlePhoebe W. Ishak, World Development, Volume 157, pp. 105933, 2022

This paper examines the effect of weather shocks on violent crime using disaggregated data from Brazilian municipalities over the period 1991–2015. Employing a distributed lag model that takes into account temporal correlations of weather shocks and spatial correlation of crime rates, I document that adverse weather shocks in the form of droughts lead to a significant increase in violent crime in rural regions. This effect appears to persist beyond the growing season and over the medium run in contrast to the conventional view perceiving weather effects as transitory. To explain this persistence, I show that weather fluctuations are positively associated not only with agriculture yields, but also with the overall economic activity. Moreover, evidence shows the dominance of opportunity cost mechanism reflected in the fluctuations of the earnings especially for the agriculture and unskilled workers, giving credence that it is indeed the income that matters and not the general socio-economic conditions. Other factors such as local government budget capacity, (un)-employment, poverty, inequality, and psychological factors do not seem to explain violent crime rates.

Long-lasting effects of incentives and social preference: A public goods experimentJournal articleMaho Nakagawa, Mathieu Lefebvre et Anne Stenger, PLOS ONE, Volume 17, Issue 8, pp. e0273014, 2022

This paper addresses the question of the effectiveness and permanence of temporary incentives to contribute to a public good. Using a common experimental framework, we investigate the effects of a recommendation that takes the form of an exhortative message to contribute, a monetary punishment and a non-monetary reward to sustain high levels of contributions. In particular, we shed light on the differential impact these mechanisms have on heterogeneous types of agents. The results show that all three incentives increase contributions compared to a pre-phase where there is no incentive. Monetary sanctions lead to the highest contributions, but a sudden drop in contributions is observed once the incentive to punish is removed. On the contrary, Recommendation leads to the lowest contributions but maintains a long-lasting impact in the Post-policy phase. In particular, it makes free-riders increase their contribution over time in the post-incentive phase. Finally, non-monetary reward backfires against those who are weakly conditional cooperators. Our findings emphasize the importance of designing and maintaining incentives not only for free-riders, but for strong and weak conditional cooperators as well, depending on characteristics of the incentives.

Confronting climate change: Adaptation vs. migration in Small Island Developing StatesJournal articleLesly Cassin, Paolo Melindi-Ghidi et Fabien Prieur, Resource and Energy Economics, Volume 69, pp. 101301, 2022

This paper examines the adaptation policy of Small Island Developing States (SIDS) facing climate change. We consider a dynamic economy with the following ingredients: (i) natural capital is an input in local production that is degraded as a result of climate change; (ii) the government has two instruments to cope with climate-related damages: it can adjust the population size thanks to migration policies and/or it can undertake adaptation measures in order to slow the degradation of natural assets; (iii) expatriates send remittances back home. We identify two critical conditions on the fundamentals of the economy that helps understand the features of the optimal policy. We especially show that in most situations, the migration policy is a valuable instrument. Calibrating the model for Caribbean SIDS, we find that the optimal policy of the Caribbean region displays heterogeneity, that is explained by the different degradation rate, population size, and endowment in natural capital. We also highlight that the higher the climate damages, the higher the incentives to conduct an active adaptation policy, combining conventional adaptation actions and migration.