Après une introduction générale et une revue de littérature (chapitre 1), l’apport de cette thèse est de déterminer le rôle de la demande dans l’émergence d’un stock de marchandises invendues. Les préférences des consommateurs sont modifiées puisqu’elles prennent en compte non seulement les quantités consommées mais également celles étalées. Le cadre d’analyse de cette thèse est celui d’un jeu stratégique à deux joueurs en univers certain, avec prix flexibles et information parfaite. Deux types de consommateurs sont considérés : certains apprécient l’étalage et d’autres non. Un monopole modifié choisit à la fois le prix et l’étalage. Les propriétés de l’équilibre de Nash en stratégies pures sont étudiées. Le chapitre 2 présente un modèle de détermination du mark-up optimal pour n’importe quelle valeur de l’élasticité prix de la demande (contrairement à l’indice de Lerner qui peut être utilisé uniquement pour les biens élastiques). Le chapitre 3, étend le second, en déterminant le coefficient multiplicateur optimal en présence de stocks d’invendus. Il permet de définir la solde optimale. Le quatrième et dernier chapitre détermine les conditions sur les fonctions d’utilité qui permettent de générer un stock d’invendus à l’équilibre de Nash en stratégies pures. Les modèles développés sont élargis au cas où un planificateur social intervient dont l’objectif est de maximiser le bien-être de l’économie. / After a general introduction and a survey of literature, the contribution of this thesis is to determine the role of the demand in the emergence of unsold stock of goods based on consumer’s preferences argument. Throughout the thesis, we consider a strategic game with two players under perfect information, certainty and price flexibility. Consumers are of two types: with appreciation to the display and without. A modified monopoly chooses both the price and the display. Chapter 2 presents an original model to determine the optimal markup for both elastic and inelastic goods (unlike the Lerner index that is used only for elastic goods). Chapter 3 is an extension of the previous one. It is about the determination of an optimal markup with the presence of unsold stock of goods. The fourth and final Chapter analyzes under which conditions an unsold stock of goods is supported by a pure strategy Nash equilibrium. All the models developed present a welfare analysis.

Made available in DSpace on 2016-04-26T20:23:57Z (GMT). No. of bitstreams: 1 Rafael Molinari Rodrigues.pdf: 958282 bytes, checksum: fbab66e40a4153aa98ad880dd360f379 (MD5) Previous issue date: 2015-10-08 / This study has the purpose of analyzing the possibility of constituting fiduciary alienation over farming products as guarantee to the financing of the Brazilian agribusiness. For this purpose, we have divided this paper in three big parties. Firstly, in order to contextualize this study, we have mentioned brief considerations about the Brazilian agribusiness, its importance to the country and to the world, and indicated an overview about the public and private financing of the activities related to the agribusiness sector. Also as a background to reach the purpose of this study, we have established in the second chapter some notions about the historical origin of the fiduciary alienation and, further, we highlighted the types of fiduciary alienation as guarantee, its legal bases and requirements, as well as we pointed out the main advantages of the fiduciary alienation as guarantee before pledge and mortgage. After this important part of contextualization, the research follows in the last chapter with a detailed analysis of the doctrinaire and jurisprudential understandings consolidated in the 1990s and until today applicable, regarding the supposed impossibility of fiduciary alienation of fungible, consumable and alienable (in stock) movable goods, as it would be the case of the farming products. After that, we propose a reanalysis of such understanding, mainly based on the legislative evolution of the fiduciary alienation as guarantee in the Brazilian legal system in the last decades and on new jurisprudence about the issue, to then defend the possibility of the fiduciary alienation over fungible, consumable and alienable movable goods. Finally, we highlight existing peculiarities and special legislation about the fiduciary alienation of farming products and we conclude that is possible the constitution of fiduciary alienation as guarantee over farming products to the financing of the agribusiness, both when those products are fungible, consumable and alienable (in stock), and in case such farming products are duly individualized, thus, they have become not fungible products / O presente trabalho tem por objetivo analisar a possibilidade de constituição de alienação fiduciária sobre produtos agropecuários, como garantia para o financiamento do agronegócio brasileiro. Para tanto, dividimos a dissertação em três grandes partes. Primeiramente, de forma a contextualizar o estudo, tecemos breves considerações sobre o agronegócio brasileiro, sua importância para o país e para o mundo, e traçamos um panorama geral sobre o financiamento público e privado das atividades relacionadas ao agronegócio. Ainda como pano de fundo para se atingir o objetivo deste trabalho, trazemos, no segundo capítulo, noções sobre a origem histórica da alienação fiduciária, para depois destacar as modalidades de alienação fiduciária em garantia, suas bases e requisitos legais, bem como as principais vantagens da alienação fiduciária em garantia frente ao penhor e à hipoteca. Após esta importante fase de contextualização, a pesquisa segue, no último capítulo, com análise detalhada acerca dos entendimentos doutrinário e jurisprudencial consolidados em meados de 1990 e até hoje aplicados, quanto à suposta impossibilidade de garantia fiduciária de bens móveis fungíveis, consumíveis e comerciáveis ou de estoque, como seria o caso dos produtos agropecuários. Em seguida, propomos uma reanálise de tais entendimentos, principalmente com base na evolução legislativa da alienação fiduciária em garantia no ordenamento jurídico brasileiro nas últimas décadas e em nova jurisprudência sobre o assunto, para depois defender a possibilidade da alienação fiduciária sobre bens móveis fungíveis, consumíveis e comerciáveis. Por fim, destacamos peculiaridades e legislação especial existentes sobre alienação fiduciária de produtos agropecuários e concluímos pela possibilidade de constituição de garantia fiduciária de produtos agropecuários para financiamento do agronegócio, tanto quando tais produtos forem fungíveis, consumíveis e comerciáveis ou de estoque, quanto no caso em que os produtos agropecuários estiverem devidamente individualizados e, por isso, terem se tornado produtos infungíveis

Cette thèse construit un modèle théorique qui renouvelle l’approche traditionnelle de l’équilibre du marché. En introduisant dans le paradigme néo-classique le principe de préférence pour la quantité, il génère de façon optimale des stocks dans un marché concurrentiel. Les résultats sont très importants, car ils expliquent à la fois l’émergence des invendus et l’existence de cycles économiques. En outre, il étudie le comportement optimal du monopole dont la puissance de marché dépend non seulement de la quantité de biens étalés, mais aussi de celle de biens achetés. Contrairement à l’hypothèse traditionnelle selon laquelle le monopoleur choisit le prix ou la quantité qui maximise son profit, il attire, via un indice de Lerner généralisé la demande à la fois par le prix et la quantité de biens exposés. Quelle que soit la structure du marché, le phénomène d’accumulation des stocks de biens apparaît dans l’économie. De plus, il a l’avantage d’expliquer explicitement les achats impulsifs non encore traités par la théorie économique. Pour vérifier la robustesse des résultats du modèle théorique, ils sont testés sur des données américaines. En raison de leur non-linéarité, la méthode de Gauss-Newton est appropriée pour analyser l’impact de la préférence pour la quantité sur la production et l’accumulation de biens, et par conséquent sur les prévisions de PIB. Enfin, cette thèse construit un modèle à générations imbriquées à deux pays qui étend l’équilibre dynamique à un gamma-équilibre dynamique sans friction. Sur la base de la contrainte de détention préalable d’encaisse, il ressort les conditions de sur-accumulation du capital et les conséquences de la mobilité du capital sur le bien-être dans un contexte d’accumulation du stock d’invendus / This thesis constructs a theoretical model that renews the traditional approach of the market equilibrium. By introducing into the neoclassical paradigm the principle of preference for quantity, it optimally generates inventories within a competitive market. The results are very important since they explain both the emergence of unsold goods and the existence of economic cycles. In addition, it studies the optimal behavior of a monopolist whose the market power depends not only on the quantity of displayed goods but also that of goods that the main consumer is willing to buy. Contrary to the traditional assumption that the monopolist chooses price or quantity that maximizes its profit, through a generalized Lerner index (GLI) it attracts customers’ demand by both the price and the quantity of displayed goods. Whatever the market structure, the phenomenon of inventory accumulation appears in the economy. Furthermore, it has the advantage of explicitly explaining impulse purchases untreated by economics. To check the robustness of the results,the theoretical model is fitted to U.S. data. Due to its nonlinearity, the Gauss-Newtonmethod is appropriate to highlight the impact of consumers’ preference for quantity on production and accumulation of goods and consequently GDP forecast. Finally, this thesis builds a two-country overlapping generations (OLG) model which extends the dynamic OLG equilibrium to a frictionless dynamic OLG gamma-equilibrium. Based on the cash-inadvance constraint, it highlights the conditions of over-accumulation of capital and welfare implications of capital mobility in a context of accumulation of stock of unsold goods.