Dominique Ami - Academia.edu (original) (raw)

Papers by Dominique Ami

Ecosystem services of coralligenous habitats under climate change

Memoires, Oublis et (Re)Appropriations : Le Risque Inondation Dans La Basse Vallee Du Rhone et L'Agglomeration Marseillaise

Final Report on the monetary valuation of mortality and morbidity risks from air pollution

... Scasny, Vojtěch Máca and Jan Urban, Charles University Prague Marie-Eve Stoeckel, EdF Ania Ba... more ... Scasny, Vojtěch Máca and Jan Urban, Charles University Prague Marie-Eve Stoeckel, EdF Ania Bartczak and Olimpia Markiewicz, University ... CV) questionnaire that has been applied in 9 countries: France, Spain, UK, Denmark, Germany, Switzerland, Czech Republic, Hungary ...

Summary Most of the concepts that are used in modern theory of financial markets are contained in... more Summary Most of the concepts that are used in modern theory of financial markets are contained in a paper published by Arrow in 1953. Arrow's model generalizes to non finite set of states describing uncertainty so as to encompass general financial assets pricing. We present several theorems of equivalence between General Equilibrium and Perfect Foresight Equilibrium (PFE), a concept adapted to financial assets markets. These results put forward several points: -The welfare properties of PFE, or in Arrow's term, the "role of securities in the optimal allocation of risk". -The role of the complete market hypothesis (CMS) and the reason why it takes an abstract mathematical form in modern finance. -The probabilistic interpretation of assets prices under the CMS hypothesis. This interpretation extends to dynamic models (as the equivalent martingale property) and allows the pricing of assets by their expected payments. -The necessary properties of equilibrium prices w...

We explore the influence of a neutral cheap talk script in three typical scenarios used in the CV... more We explore the influence of a neutral cheap talk script in three typical scenarios used in the CV literature devoted to the valuation of air pollution effects. We show that cheap talk has a differentiated effect depending on the scenario implemented. It decreases protest responses with no effect on WTP values in the scenario based on a new drug. When a move to a less polluted city is involved, it has no effect on protest responses but decreases WTP values. Surprisingly, cheap talk increases protest responses but decreases WTP values when new regional air pollution regulations are at stake.

Document de Travail n°2005-62 IS FISHING COMPATIBLE WITH ENVIRONMENTAL CONSERVATION: A STOCHASTIC MODEL WITH AN ELEMENT OF SELF-PROTECTION Is fishing compatible with environmental conservation: A stochastic model with an element of self-protection. Is fis

The purpose of this paper is to introduce the impact of fishing activity on a marine eco-system. ... more The purpose of this paper is to introduce the impact of fishing activity on a marine eco-system. We define fishing not only through annual harvest, but also through a second component, called the degree of protection of the fishery environment. This characterizes the environmental impact of fishing. A stochastic dynamic programming problem is presented in infinite horizon, where a sole owner seeks to maximize a discounted expected profit. We assume a stochastic stock-recruitment relationship where both components of the fishing activity have an impact on the probability law of the state of the fishery environment. We characterize the optimal fishing policy and we compare it with standard models. We find that the optimal policy is not a constant escapement policy and indicates an element of self-protection by the fishery manager. We also analyze the existence of degrees of protection of the fishery environment that take into account the environmental conservation and preservation of ...

Dans cette etude, nous soulignons l'importance d'un facteur s'averant significatif da... more Dans cette etude, nous soulignons l'importance d'un facteur s'averant significatif dans les problemes des dilemmes sociaux. Il s'agit de la perception par les usagers d'une ressource renouvelable commune de leurs actions passees et de leur role dans la formation du profit. La dynamique d'apprentissage a alors un impact sur les profits actuels. Pour ce faire, nous travaillons dans un cadre dynamique qui permet de modeliser l'impact des actions passee des usagers sur l'etat de la ressource et, donc, sur leurs profits. Nous analysons les equilibres de la ressource renouvelable commune en fonction des trois modeles d'apprentissage adaptes du modele de Roth-Erev qui decrit les differentes perceptions de ce probleme. Certaines recommandations sont fournies en rapport avec les resultats des simulations. Les parametres du modele dynamique utilise sont calibres pour le cas de la peche a Marseille

« Mémoires, Oublis et (ré)appropriations : Le risque inondation dans la basse vallée du Rhône et l’agglomération marseillaise », Claeys C. (dir), Programme de recherche "Risque, Décision, Territoire

Consentements à payer pour une réduction du risque

Revue D Economie Politique, 2000

Acceso de usuarios registrados. Acceso de usuarios registrados Usuario Contraseña. ...

In the Gordon-Schaefer model (G-S model), widely used to design fisheries management policy, only... more In the Gordon-Schaefer model (G-S model), widely used to design fisheries management policy, only resource stock dynamic is considered and carrying capacity is constant. We propose an extension to the G-S model that incorporates the dynamics of carrying capacity as an indicator of dynamics of the marine habitats. The study yields two main findings. First, we demonstrate that habitats matter, by showing that the main outcomes of the G-S model are dramatically modified if habitats are included in the analysis. Second, through a heuristic model and simulations, we show, for the first time, that our extended model provides an appropriate framework to analyse the putative contribution of MPAs and ARs. The model presented in this article opens the way to a better understanding of the benefits of MPAs and ARs, as well as other habitat protection policies.

We study how actors perceive the coastline and its governance around the big city of Marseille. T... more We study how actors perceive the coastline and its governance around the big city of Marseille. The analysis is based on the Institutional Analysis Development (IAD) framework. Interviews were carried out in order to get information about actors' definition of coastline, what is important for them, their perception of uses, conflicts and equity and governance in this area. From these interviews we show a first series of institutional performances diagnostics about the coastline relevant intuitions, around the big city of Marseille. A major institution appears to be The National Park of Calanques even though its launch process is questioned. Operational rules and rules of collective choice are found to be globally accepted by actors; by contrast, constitutional rules seem to be perceived as missing from the launch of the National Park.

Micro-économie des marchés financiers : equilibre général, arbitrage et marchés complets

Grace aux resultats issus des modeles de l'economie de l'incertain, nous etudions la noti... more Grace aux resultats issus des modeles de l'economie de l'incertain, nous etudions la notion d'equilibre definie sur les marches financiers et les proprietes particulieres dont sont dotes les prix des titres. Ces proprietes sont issues de modeles purement financiers dans lesquels le principe de l'arbitrage est fondamental et se substitue a la notion d'equilibre concurrentiel. Nous construisons des economies d'echange pur dans lesquelles coexistent des marches d'actifs financiers et des marches de biens de consommation. Differentes structures sont envisagees. Elles sont caracterisees par la nature de leur incertitude (elle peut etre decrite par un nombre fini ou non d'evenements) et par l'organisation de leurs echanges (ils peuvent etre statiques ou dynamiques). Nous analysons dans de telles economies, les liens entre l'existence d'un equilibre, qui ait de bonne proprietes d'optimalite et la possibilite de determiner un prix d'arbitr...

Introduction generale : La mise en place de reseaux de surveillance de la qualite des eaux cotier... more Introduction generale : La mise en place de reseaux de surveillance de la qualite des eaux cotieres du type REPHY par L'IFREMER releve d'une logique de sante publique et s'inscrit largement dans un principe de precaution a l'egard de la consommation de coquillages destines a la consommation humaine. Les benefices a mettre en regard avec les couts de gestion du reseau REPHY (estimes a 7,4 millions de FF en 1995) sont donc en priorite la reduction du risque d'intoxication et peuvent etres apprehendes par l'evitement des couts sanitaires qui y sont associes. La valorisation de ces benefices directs n'est cependant pas chose aisee. Le reseau conduit en effet a la reduction des occurrences d'intoxication de telle sorte que les donnees epidemiologiques sur lesquelles un tel calcul doit etre fonde s'amenuisent au fil du temps. La presence du reseau genere par ailleurs des benefices indirects en termes d'utilite derivee de la consommation de produits ...

Journal of Choice Modelling

Stated preference surveys are usually carried out in one session, without any follow-up interview... more Stated preference surveys are usually carried out in one session, without any follow-up interview after respondents have had the opportunity to experience the public goods or policies they were asked to value. Consequently, a stated preference survey needs to be designed so as to provide respondents with all the relevant information, and to help them process this information so they can perform the valuation exercise properly. In this paper, we study experimentally an elicitation procedure in which respondents are provided with a sequence of different types of information (social cues and objective information) that allows them to sequentially revise their willingness-to-pay (WTP) values. Our experiment was carried out in large groups using an electronic voting system which allows us to construct social cues in real time. To analyse the data, we developed an anchoring-type structural model that allows us to estimate the direct effect (at the current round) and the indirect effect (on subsequent rounds) of information. Our results shed new light on the interacted effect of social cues and objective information: social cues have little or no direct effect on WTP values but they have a strong indirect effect on how respondents process scientific information. Social cues have the most noticeable effect on respondents who initially report a WTP below the group average but only after receiving additional objective information about the valuation task. We suggest that the construction and the provision of social cues should be added to the list of tools and controls for stated preference methods. "Faced with the choice between changing one's mind and proving that there is no need to do so, almost everyone gets busy on the proof." Galbraith, 1971.

VertigO

Un diagnostic de gouvernance basé sur le discours des acteurs : le cas du lit... VertigO-la revue... more Un diagnostic de gouvernance basé sur le discours des acteurs : le cas du lit... VertigO-la revue électronique en sciences de l'environnement, Volume 18 numéro 2 | septembre 2018 Un diagnostic de gouvernance basé sur le discours des acteurs : le cas du lit...

Marine Pollution Bulletin

The understanding of ecosystem services is essential to support sustainable use and preservation ... more The understanding of ecosystem services is essential to support sustainable use and preservation of ecosystems. Coralligenous habitats, main contributors of the Med iterranean marine biod iversity, are yet und erstud ied in term of services provid ed. This stud y presents an original small-scale approach to investigate the services provided by coralligenous habitats of a French stud y area consisting of two marine sites (Marseille and Port-Cros sites) in order to cover two contrasted anthropogenic pressure despite the small-scale. Our results are based on the opinions of 43 experts who ranked 15 services in terms of existence and level of importance for human well-being: supporting ecological functions were consid ered the most important, then provisioning and cultural services. Regulating services were consid ered uncertain d ue to a lack of knowled ge. The small-scale approach highlighted a need for a referential frame to determine the existence of services (e.g. geographical and temporal scales, benefits and beneficiaries levels).

Revue économique, 2017

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ET SI CE QUE JâAI FAIT HIER INFLUAIT SUR MON PROFIT AUJOURDâHUI? Un modÃ¨le bio-Ã©conomique de libre accÃ¨s oÃ¹ les agents apprennent seuls

Most of the concepts that are used in modern theory of financial markets are contained in a paper... more Most of the concepts that are used in modern theory of financial markets are contained in a paper published by Arrow in 1953. Arrow's model generalizes to non finite set of states describing uncertainty so as to encompass general financial assets pricing.

Le traitement des r�ponses �gales � z�ro dans l'�valuation contingente