Publications

La plupart des informations présentées ci-dessous ont été récupérées via RePEc avec l'aimable autorisation de Christian Zimmermann
Assessing the potential outcomes of achieving the World Health Organization global non-communicable diseases targets for risk factors by 2025: is there also an economic dividend?Journal articleMarion Devaux, A. Lerouge, Bruno Ventelou, Y. Goryakin, A. Feigl, S. Vuik et M. Cecchini, Public Health, Volume 169, pp. 173-179, 2019

Objectives:
This study assesses the change in premature mortality and in morbidity under the scenario of meeting the World Health Organization (WHO) global targets for non-communicable disease (NCD) risk factors (RFs) by 2025 in France. It also estimates medical expenditure savings because of the reduction of NCD burden.

Study design:
A microsimulation model is used to predict the future health and economic outcomes in France.

Methods:
A ‘RF targets’ scenario, assuming the achievement of the six targets on RFs by 2025, is compared to a counterfactual scenario with respect to disability-adjusted life years and healthcare costs differences.

Results:
The achievement of the RFs targets by 2025 would save about 25,300 (and 75,500) life years in good health in the population aged 25–64 (respectively 65+) years on average every year and would help to reduce healthcare costs by about €660 million on average per year, which represents 0.35% of the current annual healthcare spending in France. Such a reduction in RFs (net of the natural decreasing trend in mortality) would contribute to achieving about half of the 2030 NCD premature mortality target in France.

Conclusions:
The achievement of the RF targets would lead France to save life years and life years in good health in both working-age and retired people and would modestly reduce healthcare expenditures. To achieve RFs targets and to curb the growing burden of NCDs, France has to strengthen existing and implement new policy interventions.

GPs’ management of polypharmacy and therapeutic dilemma in patients with multimorbidity: a cross-sectional survey of GPs in FranceJournal articleHélène Carrier, Anna Zaytseva, Aurélie Bocquier, Patrick Villani, Hélène Verdoux, Martin Fortin et Pierre Verger, British Journal of General Practice, Volume 69, Issue 681, pp. e270-e278, 2019

Background:
GPs are confronted with therapeutic dilemmas in treating patients with multimorbidity and/or polypharmacy when unfavourable medication risk–benefit ratios (RBRs) conflict with patients’ demands.

Aim:
To understand GPs’ attitudes about prescribing and/or deprescribing medicines for patients with multimorbidity and/or polypharmacy, and factors associated with their decisions.

Design and setting:
Cross-sectional survey in 2016 among a national panel of 1266 randomly selected GPs in private practice in France.

Method:
GPs’ opinions and attitudes were explored using a standardised questionnaire including a case vignette about a female treated for multiple somatic diseases, sleeping disorders, and chronic pain. Participants were randomly assigned one of eight versions of this case vignette, varying by patient age, socioprofessional status, and stroke history. Backward selection was used to identify factors associated with GPs’ decisions about drugs they considered inappropriate.

Results:
Nearly all (91.4%) responders felt comfortable or fairly comfortable deprescribing inappropriate medications, but only 34.7% decided to do so often or very often. In the clinical vignette, most GPs chose to discontinue symptomatic medications (for example, benzodiazepine, paracetamol/tramadol) because of unfavourable RBRs. When patients asked for ketoprofen for persistent sciatica, 94.1% considered this prescription risky, but 25.6% would prescribe it. They were less likely to prescribe it to older patients (adjusted odds ratio [AOR] 0.48, 95% confidence interval [CI] = 0.36 to 0.63), or those with a stroke history (AOR 0.55, 95% CI = 0.42 to 0.72).

Conclusion:
In therapeutic dilemmas, some GPs choose to prioritise patients’ requests over iatrogenic risks. GPs need pragmatic implementation tools for handling therapeutic dilemmas, and to improve their skills in medication management and patient engagement in such situations.

Inequality measurement with an ordinal and continuous variableJournal articleNicolas Gravel, Brice Magdalou et Patrick Moyes, Social Choice and Welfare, Volume 52, Issue 3, pp. 453-475, 2019

What would be the analogue of the Lorenz quasi-ordering when the variable of interest is continuous and of a purely ordinal nature? We argue that it is possible to derive such a criterion by substituting for the Pigou-Dalton transfer used in the standard inequality literature what we refer to as a Hammond progressive transfer. According to this criterion, one distribution of utilities is considered to be less unequal than another if it is judged better by both the lexicographic extensions of the maximin and the minimax, henceforth referred to as the leximin and the antileximax, respectively. If one imposes in addition that an increase in someone’s utility makes the society better off, then one is left with the leximin, while the requirement that society welfare increases as the result of a decrease of one person’s utility gives the antileximax criterion. Incidentally, the paper provides an alternative and simple characterisation of the leximin principle widely used in the social choice and welfare literature.

General distribution of consumers in pure Hotelling gamesJournal articleGaëtan Fournier, International Journal of Game Theory, Volume 48, Issue 1, pp. 33-59, 2019

A pure Hotelling game is a spatial competition between a finite number of players who simultaneously select a location in order to attract as many consumers as possible. In this paper, we study the case of a general distribution of consumers on a network generated by a metric graph. Because players do not compete on price, the continuum of consumers shop at the closest player’s location. If the number of sellers is large enough, we prove the existence of an approximate equilibrium in pure strategies, and we construct it.

Demand Learning and Firm Dynamics: Evidence from ExportersJournal articleNicolas Berman, Vincent Rebeyrol et Vincent Vicard, The Review of Economics and Statistics, Volume 101, Issue 1, pp. 91-106, 2019

This paper provides direct evidence that learning about demand is an important driver of firms’ dynamics. We present a model of Bayesian learning in which firms are uncertain about idiosyncratic demand in each market and update their beliefs as noisy information arrives. Firms update their beliefs to a given demand shock more, the younger they are. We test and empirically confirm this prediction, using the structure of the model, together with exporter-level data, to identify demand shocks and the firms’ beliefs about future demand. Consistent with theory, we also find the learning process to be weakened in more uncertain environments.

Green Public Procurement v.s. Environmental Taxation: implications for EU-MENA environmental policyJournal articleVera Danilina et Federico Trionfetti, FEMISE MED brief, Issue 16, 2019

Environmental policies are among the priorities of the UN agenda and figure highly in national and international policy agendas. This brief focuses on environ-mental taxes and green public procurement (GPP). These two environmental po-licy instruments differ in political viability and in the impact they have on consu-mers and producers. The brief provides a comparative analysis of their efficiency in closed and open economy and reveals the opportunities and threats of (un)harmo-nised environmental policy across countries. The results allow to consider particu-lar implications for the collaboration of EU-MENA countries.

Information technologies and entrepreneurshipJournal articleJulien Hanoteau et Jean-Jacques Rosa, Managerial and Decision Economics, Volume 40, Issue 2, pp. 200-212, 2019

This article shows how the increase of information availability due to new technologies positively affects aggregate entrepreneurship in national economies. We rely on an “occupational choice” model of managerial production, extended to include the managerial use of information, to explain variations in the number of entrepreneurs, and thus of firms, as measured by the aggregate new business creation data. We present evidence that supports such a theory of industrial organization dynamics for a sample of 78 economies over the period 2004–2012 using panel data instrumental variable regressions.

International credit markets and global business cyclesJournal articlePatrick A. Pintus, Yi Wen et Xiaochuan Xing, International Journal of Economic Theory, Volume 15, Issue 1, pp. 53-75, 2019

This paper stresses a new channel through which global financial linkages contribute to the co‐movement in economic activity across countries. We show in a two‐country setting with borrowing constraints that international credit markets are subject to self‐fulfilling variations in the world real interest rate. Those expectation‐driven changes in the borrowing cost in turn act as global shocks that induce strong cross‐country co‐movements in both financial and real variables (such as asset prices, gross domestic product, consumption, investment, and employment). When firms around the world benefit from unexpectedly low debt repayments, they borrow and invest more, which leads to excessive supply of collateral and of loanable funds at a low interest rate, thus fueling a boom both at home and abroad. As a consequence, business cycles are synchronized internationally. Such a stylized model thus offers one way to rationalize both the existence of a world business‐cycle component, documented by recent empirical studies through dynamic factor analysis, and the factor's intimate link to global financial markets.

Book Review: Richard Bradley, Decision Theory with a Human FaceJournal articleNicolas Gravel, Œconomia. History, Methodology, Philosophy, Volume 9, Issue 1, pp. 149-160, 2019

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Talent, equality of opportunity and optimal non-linear income taxJournal articleAlain Trannoy, The Journal of Economic Inequality, Volume 17, Issue 1, pp. 5-28, 2019

We adopt a philosophical perspective of equality of opportunity and address the issue of whether outcome inequalities are legitimate when they come from differences in talent. We propose a cumulative definition of talent. In a dynamic setting, talent is a by-product of past-effort, current effort and innate talent, which becomes a residual as time goes by. It implies that talent can change from the status of a circumstance when people are young to an almost responsibility variable when people are getting older. We plug this definition of talent into the Mirrlees model of optimal non-linear income tax and we show that the conflict between the principle of compensation and the principle of natural reward boils down to the optimal income tax with Rawlsian weights in the second-best setting.