This dissertation thesis is focused on the microeconomic analysis of public policy in the Czech Republic. It consists of three parts, the first two parts deal with the analysis of tax policy; the third part of this thesis is focused on inflation differentials. The first chapter deals with the analysis of value added tax. The rates of value added tax (VAT) have recently changed in the Czech Republic, and I simulate the impact of these reforms. They are an example of changes in indirect taxes that change the prices of goods and services, to which households can respond by adjusting their expenditures. I first estimate the behavioural response of consumers to price changes in the Czech Republic by applying a consumer demand model of the quadratic almost ideal system (QUAIDS) on the basis of the Czech Statistical Office household expenditure and price data for the period from 2001 to 2011. I derive estimates of own- and cross-price and income elasticities for individual households. I then use these elasticities to estimate the impact of the changes in VAT rates that were proposed or implemented between 2011 and 2013, on households' quantity demanded and government revenues. One of the main findings is that the estimated increases in government revenues that take the consumer responses into account are...

The insolvency business represents an excellent subject for a wide and diverse range of economic agents and may be the result of complex internal and external factors to the company. Considering these factors, it is assumed the assumption that fundamental analysis fulfills an important role in addressing these issues, whether in character microeconomic or macroeconomic context. In order to investigate the influence and behavior of these factors, identified from the macroeconomic, sectoral, and the fundamentals of companies, we use the statistical method and technique of multivariate discriminant analysis. The main restrictive assumption concerns the relevance of including variables other than those normally used in forecasting models of corporate insolvency. The investigation process is delimited as follows: in spatial terms of specificity and covers large companies with a designation of SA (corporation) a publicly traded operating in Brazil. The time frame considered the year 2008 and covers the macroeconomic and microeconomic variables. And as research design considers the observational study in conjunction with the application of multivariate statistical method and by the statistical technique of discriminant analysis. Given the various studies related to prediction of bankruptcy that are very similar to this research, probably the significance of financial ratios representing the predictor variables normally used in the discriminant model variables and distinctly included in this analysis is relatively similar, where the statistical significance of each of these variables is coherent and consistent in the analysis of insolvency of Brazilian companies. / A insolvência empresarial representa um tema relevante para um conjunto amplo e diversificado de agentes econômicos e pode ser resultado de um complexo de fatores internos e externos à empresa. Tendo em vista estes fatores, assume-se o pressuposto de que a análise fundamentalista cumpre papel relevante ao tratar destes aspectos, sejam eles em caráter microeconômico ou num contexto macroeconômico. No intuito de investigar a influência e o comportamento destes fatores, identificados a partir das variáveis macroeconômicas, setoriais e dos fundamentos das empresas, utiliza-se o método estatístico multivariado e a técnica de análise discriminante. A principal hipótese restritiva se refere à relevância da inclusão de variáveis distintas das normalmente utilizadas em modelos de previsão de insolvência empresarial. O processo de investigação delimita-se da seguinte forma: em termos espaciais e de especificidade, abrange empresas de grande porte com denominação de S.A. (Sociedade Anônima) de capital aberto atuantes no Brasil. A delimitação temporal considera o ano de 2008 e engloba as variáveis macroeconômicas e microeconômicas. E como delineamento de pesquisa considera-se o estudo observacional em conjunto com a aplicação do método estatístico multivariado e mediante a técnica estatística de análise discriminante. Diante dos vários estudos ligados à previsão de insolvência que em muito se assemelham a esta pesquisa, provavelmente a relevância dos índices financeiros que representam as variáveis preditoras normalmente utilizadas no modelo discriminante e as variáveis distintamente incluídas nesta análise seja relativamente semelhante, onde a significância estatística de cada uma destas variáveis seja coerente e consistente no processo de análise de insolvência de empresas brasileiras.

Ce travail contribue à la définition des mesures de l'efficacité et de la productivité dans la théorie microéconomique. Il présente des apports théoriques et empiriques. En premier lieu, cette thèse élabore une critique sur certaines mesures classiques de l’efficacité et de la productivité. Il est montré que la mesure directionnelle, sous l'hypothèse de rendements d'échelle constants, pose un certain nombre de problèmes quant à l’évaluation des variations de la productivité. De plus, il est établi que la « slacks-based » et la directionnelle « slack-based » mesures (ou mesures de Färe-Lovell) ne permettent pas de caractériser la technologie de production. Il résulte que ce type de mesure ne permet pas d’évaluer l'efficacité et les variations de productivité. Une approche alternative est proposée qui permet de contourner cette difficulté. Ensuite, cette thèse introduit deux nouveaux indicateurs: un indicateur social de Luenberger-Hicks-Moorsteen et un indicateur de productivité généralisé. Le premier permet d'évaluer l'effet des politiques sur les capabilités au sens d'A. Sen. Il consiste en une transposition des indicateurs de Hicks-Moorsteen en considérant le rôle spécifique d’un sous-vecteur prenant en compte les facteurs sociaux. Le second indicateur généralise les indicateurs standards de productivité. Il permet de retrouver à la fois les indicateurs de Luenberger et le Luenberger Hicks-Moortsteen comme cas spéciaux de cet indicateur généralisé. En considérant la version multiplicative de l’indicateur généralisé, on retrouve comme cas particuliers, les indicateurs de Malmquist et le Hicks-Moorsteen. Enfin, cette thèse présente des applications empiriques qui illustrent la méthodologie. Ces études évaluent et comparent la performance des régions touristiques et plus précisément celle du Languedoc-Roussillon, qui mobilise un cadre d'analyse transfrontalier. / This phd contributes to the definition of efficiency measures and productivity indicator, in the microeconomic theory. It presents theoretical and empirical contributions. Firstly, this phd develops a review on standard measures of efficiency and productivity. It is shown that the directional measure, under the assumption of constant returns to scale, raises some problems in the assessment of productivity changes. Moreover, it is established that the "slacks-based" and directional "slack-based" measures (or Färe-Lovell measures) do not allow to characterize technology. It follows that such measures do not allow to evaluate efficiency and productivity changes. An alternative approach is proposed which overcomes this difficulty. Then, this phd introduces two new indicators: a social Luenberger-Hicks-Moorsteen indicator and a generalized indicator of productivity. The first mesure the impact of publics policies in the line of the capability theory introduce by A. Sen. This indicator consists on a transposition of the Hicks-Moorsteen indicator by considering a sub-vector of social factors. The second indicator generalizes standards productivity indicators. It allows to find the Luenberger and the Luenberger Hicks-Moortsteen as special cases of this general indicator. Considering the multiplicative version of the generalized indicator, on can find the Malmquist and Hicks-Moorsteen indicators, as special cases. Finally, this phd presents some empirical applications to illustrate the methodology. These studies evaluate and compare the performance of the tourist destination, and specifically for the Languedoc-Roussillon, which involves a cross-border analysis framework

Most of mining operations in Indonesia use open pit mine methods, with truck and shovel system and a large amount of manpower. The mining industry plays an important role contributed to the national economy and development in Indonesia, otherwise the mine accidents become as sensitive issue or problem. The main cause of mine accidents is still dominant of the low safety awarenesses and accountabilities, and also improperly cost spent on the occupational health and safety (OSH) programs. This thesis describes the concept behind the return on prevention and workers‟ perception descriptive analyses of the occupational health and safety in relation to improve safety performances. The proactive action plan related to accidents prevention is as an essential step of the risk management processes. Participation and intervention for all employees are important and urgent, especially for the frontline workers, which are crucial in achieving good safety performances with financial support properly. The main objective of this study evaluates of the workers‟ perception and cost spent on the occupational health and safety program at the companies in relation to accident prevention efforts. In general, the several objectives are described to evaluate of the mine accident rates, the validity and reliability tests of the questionnaires, workers relationships and suggestions, interviews, observations, and the OSH cost effectiveness. The methods of this study are assessed by the descriptive statistical analysis approaches of the return on prevention with the microeconomic model of the net present value, internal rate of return, and cost benefit analysis to justify the benefits return and the break even point and interventions directly according to the workers‟ perception through questionnaire, interview, and observation. The methodology is assessed by the gathering data obtained from the companies through the surveys of the questionnaire, interview, observation, and the money expenses in the occupational health and safety for the workers. The valuation methods are used by the degree of significance of 95%, margin of error 5%, with total number of respondents are 1,600 persons as sampling which representation of the four surface coal mine companies in Indonesia. The seven elements are a basic assessment approached of the training and education, personal protective equipment, preventive medical check up, employment injury insurance, improvement existing technology, signalization, and organization. The result shows the advantages using these analyses which described the importance of the money invested on OSH and effectiveness of interventions by worker‟s perception in order to prevent accidents at workplace. The effectiveness of interventions to the environment working conditions and workers mindsets directly. The OSH cost invested for workers, in general, will triggers the work performances to be better, and then the occupational health and safety in a strong position to achieve the goals of the company. Improvement safety awareness and accountability of workers shall reduce or prevent accidents at work, and the company should be invested money in the OSH program with the minimum amount is US $ 207.17 per employee or US $ 0.12 per ton of coal produced. The investment of the people and money properly shall give significant impacts in preventing accidents to achieve zero accident vision in order to protect people, property, process and profit of the company for short or long term benefits, and will also give a good images for sustainable in mining business.

In interference-limited wireless networks, interference management techniques are important in order to improve the performance of the systems. Given that spectrum and energy are scarce resources in these networks, techniques that exploit the resources efficiently are desired. We consider a set of base stations operating concurrently in the same spectral band. Each base station is equipped with multiple antennas and transmits data to a single-antenna mobile user. This setting corresponds to the multiple-input single-output (MISO) interference channel (IFC). The receivers are assumed to treat interference signals as noise. Moreover, each transmitter is assumed to know the channels between itself and all receivers perfectly. We study the conflict between the transmitter-receiver pairs (links) using models from game theory and microeconomic theory. These models provide solutions to resource allocation problems which in our case correspond to the joint beamforming design at the transmitters. Our interest lies in solutions that are Pareto optimal. Pareto optimality ensures that it is not further possible to improve the performance of any link without reducing the performance of another link. Strategic games in game theory determine the noncooperative choice of strategies of the players. The outcome of a strategic game is a Nash equilibrium. While the Nash equilibrium in the MISO IFC is generally not efficient, we characterize the necessary null-shaping constraints on the strategy space of each transmitter such that the Nash equilibrium outcome is Pareto optimal. An arbitrator is involved in this setting which dictates the constraints at each transmitter. In contrast to strategic games, coalitional games provide cooperative solutions between the players. We study cooperation between the links via coalitional games without transferable utility. Cooperative beamforming schemes considered are either zero forcing transmission or Wiener filter precoding. We characterize the necessary and sufficient conditions under which the core of the coalitional game with zero forcing transmission is not empty. The core solution concept specifies the strategies with which all players have the incentive to cooperate jointly in a grand coalition. While the core only considers the formation of the grand coalition, coalition formation games study coalition dynamics. We utilize a coalition formation algorithm, called merge-and-split, to determine stable link grouping. Numerical results show that while in the low signal-to-noise ratio (SNR) regime noncooperation between the links is efficient, at high SNR all links benefit in forming a grand coalition. Coalition formation shows its significance in the mid SNR regime where subset link cooperation provides joint performance gains. We use the models of exchange and competitive market from microeconomic theory to determine Pareto optimal equilibria in the two-user MISO IFC. In the exchange model, the links are represented as consumers that can trade goods within themselves. The goods in our setting correspond to the parameters of the beamforming vectors necessary to achieve all Pareto optimal points in the utility region. We utilize the conflict representation of the consumers in the Edgeworth box, a graphical tool that depicts the allocation of the goods for the two consumers, to provide closed-form solution to all Pareto optimal outcomes. The exchange equilibria are a subset of the points on the Pareto boundary at which both consumers achieve larger utility then at the Nash equilibrium. We propose a decentralized bargaining process between the consumers which starts at the Nash equilibrium and ends at an outcome arbitrarily close to an exchange equilibrium. The design of the bargaining process relies on a systematic study of the allocations in the Edgeworth box. In comparison to the exchange model, a competitive market additionally defines prices for the goods. The equilibrium in this economy is called Walrasian and corresponds to the prices that equate the demand to the supply of goods. We calculate the unique Walrasian equilibrium and propose a coordination process that is realized by the arbitrator which distributes the Walrasian prices to the consumers. The consumers then calculate in a decentralized manner their optimal demand corresponding to beamforming vectors that achieve the Walrasian equilibrium. This outcome is Pareto optimal and lies in the set of exchange equilibria. In this thesis, based on the game theoretic and microeconomic models, efficient beamforming strategies are proposed that jointly improve the performance of the systems. The gained results are applicable in interference-limited wireless networks requiring either coordination from the arbitrator or direct cooperation between the transmitters.

<p>\textbf{Chapter 1}\\</p> <p>This paper explores the implications of the mismatch hypothesis in the context of the labor market using a survey on newly licensed US lawyers called the After the JD Study. Using a triple difference approach, I measure the impact of diversity quotas on marginal minority workers’ future salaries, promotion rates, and leaving rates for occupation and job. With middling statistical power, my findings are in line with the mismatch hypothesis in that beneficiaries of the diversity quota policy are made ex-ante worse off. My findings are also in line with recent literature on diminishing racial outcome gaps by skill.</p> <p><br></p> <p>\textbf{Chapter 2}\\</p> <p>In this paper, we provide theoretical framework for three models of Digital Media Firm behavior called \textit{Premium}, \textit{Free-to-Play}, and \textit{Play-to-Earn} as well as suggest an empirical measure of firm ponzi-likeness. First, we study a baseline model optimal price and quality of a digital product, the premium model. Second, we extend the baseline model where some customers, called minnows, receive the product for free and other customers, called whales, pay a price for a better version of the product, this is the free-to-play model. Finally, we explore a model where customers receive a security-like asset from the firm and this asset acts like a negative price while also subsidizing the firm's revenue. This final model provides an environment for much research. We show that, even when firms are ponzi-schemes in this final model, quality of the product need not be at a minimum. We also briefly discuss how one would measure the ponzi-likeness of a digital media firm in the third model setting. </p> <p><br></p> <p>\textbf{Chapter 3}\\</p> <p>In this paper, I explore unique measures of racial prejudice and their impact on black wages in the labor market using the General Social Survey, Current Population Survey and the NLSY79. I generate two variables to proxy for racial prejudice which are extracted from the GSS and the NLSY79. The first variable, drawn from the GSS, measures prejudice sentiment towards blacks and the second, drawn from the NLSY79, measures individual experience with racial discrimination. I use these measurements to proxy for racial prejudice and its impact on the black-white wage gap. I find that these variables are two distinctly different measures of racial discrimination in the labor market, providing a powerful instrument for measuring racial discrimination in the labor market. They also provide the insight that, while racial prejudice may be high in certain occupations and regions, this sentiment does not directly impact black outcomes. Specifically, wages are more sensitive to racial prejudice in WC jobs than in BC jobs. </p>

Projet de recherche réalisé en 2014-2015 avec l'appui du Fonds de recherche du Québec – Société et culture. / Ce mémoire vise à évaluer les effets de variations des attentes des firmes quant à la protection conférée par les droits de propriété intellectuelle (« PI ») pour les inventions et innovations dans un milieu industriel d’innovation ouverte. D’abord, les régimes de PI aux États-Unis et au Canada sont analysés à travers des cas jurisprudentiels et législatifs et des traités internationaux afin d’illustrer de quelle façon les normes juridiques changent et démontrer les répercussions sur les attentes des firmes. Puis, les attributs du modèle de l’innovation ouverte, où les firmes gèrent à dessein leurs relations d’affaires avec une attitude d’ouverture, sont décrits et sa pertinence est appuyée à l’aide d’un modèle simple. L’accent est mis sur son traitement distinctif des échanges de connaissances et d’intrants à l’intérieur même des firmes et entre elles. Une fois ces notions établies et s’y référant à titre d’hypothèses, un modèle microéconomique des échanges de connaissances entre firmes est élaboré, avec deux variables de choix, la PI et le secret, qui captent les mécanismes de gestion technologique des firmes. Par la tension entre ces variables, les processus de prise de décisions et les interactions entre les firmes sont évalués au moyen d’une analyse statique. Pour étudier plus en détails les choix des firmes, une version à deux joueurs du modèle est examinée au moyen de la théorie des jeux. Dans toutes ces formes du modèle, l’impact des fluctuations des attentes des firmes relativement au droit de la PI est jaugé. Tel que prévu, ces effets pour une firme changent en fonction des choix de gestion de chacune des firmes. Les effets varient également eu égard à la nature des relations à travers lesquelles les échanges de connaissance ont lieu. Dans la variante à deux joueurs, la statique comparative d’un équilibre de Nash en stratégie mixte montre que la relation avec l’autre joueur imprègne les incidences des variations du droit sur les stratégies de gestion technologique. Par exemple, une hausse des attentes de protection juridique de la PI couvrant la technologie d’une firme peut étonnamment mener cette firme à moins y recourir. / The purpose of this thesis is to assess the effects of changes in firms’ expectations of intellectual property (“IP”) law protection over inventions and innovations in an industrial environment characterized by open innovation practices. To begin, a legal analysis of IP regimes in Canada and the United States is achieved through different cases of court decisions, legal amendments and international treaties in order to show how legal standards vary and to demonstrate the repercussions of legal shifts over firms’ expectations. Then, the characteristics of the open innovation management model, in which firms adopt a purposively open mindset in their business relationships, are described, and its relevance is supported using a simple model. Emphasis is laid upon open innovation’s distinguishable treatment of intra- and inter-firm flows of knowledge and inputs. Building on these insights and using them as assumptions, a microeconomic model of firms’ knowledge flow interactions is constructed, with two choice variables that capture firms’ technology management mechanisms in an open innovation industrial environment: IP and secrecy. Through the tension between these two variables, inter-firm interactions and decision-making processes are assessed with a static analysis. To study firms’ choices in greater detail, a two-firm version of the model is then examined using game theory. Throughout, the impact of fluctuations in firms’ expectations of IP law is assessed. As expected, these effects, for a focal firm, vary depending on that firm’s technology management decisions as well as other firms’. Effects also differ with respect to the nature of knowledge flows relationships that each firm undertakes. In the two-firm game theoretic version of the model, comparative statics of a mixed-strategy Nash Equilibrium show that the relationship with the other firm qualifies the consequences of legal shifts on firms’ technology management strategies. Notably, increasing expectations of IP protection for a firm’s technology might actually result in this firm relying less on IP.

L'émergence d'invendus constitue un phénomène de première importance. En effet, il n'y a pas d'entreprise sans invendus. C'est pourquoi les entreprises souhaitent éliminer les invendus en fin de période de vente. Dans ce cadre une nouvelle problématique émerge : comment valoriser un stock d'invendus et optimiser son déstockage ? C'est l'objet du travail doctoral que de répondre à cette question fondamentale du point de vue de la science économique. Pour cela, il faut tout d'abord déterminer à quel prix une firme peut-elle déstocker ses invendus et ensuite dé-terminer quand doit-elle avoir recours au marché du déstockage ou aux soldes directes ? Cette thèse consacre une première partie à un survol de la littérature,à la fois en management et marketing, mais surtout en sciences économiques. La seconde partie propose un modèle original de valorisation des invendus qui adapte en microéconomie les méthodes de couvertures utilisées en finance, notamment les options, dans le cas où la demande est incertaine. Il est montré d'un point de vue théorique qu'il est possible de proposer une couverture contre le risque d'invendus.D'une part la théorie est adaptée au cas de l'approvisionnement, et d'autre part au cas des invendus. Des simulations chiffrées illustrent comment fonctionne concrètement cette méthode dans chacun des cas. La troisième partie est plus générale et développe deux modèles originaux inter-temporels dans le cadre d'un marché monopolistique. Il y a deux types de consommateurs, ceux qui sont sensibles à l'étalage des biens, et ceux qui sont insensibles à cet étalage. Les consommateurs sensibles à l'étalage, choisissent la part qu'ils achètent de cet étalage, cependant que le monopole choisit à la fois le prix et l'étalage. Que la demande soit certaine ou incertaine, il émerge toujours un stock d'invendus. Le monopole peut le revendre, soit directement aux consommateurs insensibles à l'étalage, soit à une firme de déstockage. L'endogénéité du marché du déstockage est alors étudiée. / Since there is not a firm without a stock of unsold goods, the study of this phenomenon is an issue of great importance. Indeed, firms face the stock of unsold goods that they want to clear at the end of the market period. The latter has an impact on not only on the firm's production process, but also on the economy growth. In this context, how to value the stock of unsold goods and when should the firm clears it ? This doctoral work aims to answer to this fundamental question from the standpoint of economics. For this purpose, we must first determineat which price a firm can clear its stock of unsold goods and then determine when it should have recourse to selling-off market or clearance sales ? The first part of this thesis is dedicated to a review of the literature, both related to management and marketing science, but also to economics. The second part focuses on an original model of unsold goods' stock valuation which is adapted to the microeconomic hedging methods used in finance (including options where the demand is uncertain). Results show that it is possible to provide a hedge against the risk of a stockof unsold goods. On the one hand, the theory is adapted to the case of supply and on the other hand, it fits the case of a stock of unsold goods. From the theoretical point of view, the results of numerical simulations illustrate the way this method works in practice for different cases. The third part is more general since it introduces two intertemporal original models under the monopolistic market structure.There are two types of consumers, depending on the degree of their sensitiveness to the display of goods (those who are sensitive versus those who are not). Consumers who are relatively strongly sensitive to the display of goods choose to buy apart from it. Furthermore, the monopoly chooses both the price and the quantityof displayed goods in order to maximize its profit. Under certain or uncertain demand,it always emerges a stock of unsold goods. The monopoly can sell the stockof unsold goods, either directly to consumers who are insensitive to the display ofgoods, or to the selling-off firm. Endogenous selling-off market is then studied.

The aim of the labor is to review the difference of development in energy politics of each EU Member state, the different development of power and gas production and consumption. Between the aims of this dissertation thesis belongs checking of the power and gas market, detection of weak and strong sites, comparison of association with insufficient production capacities and problems with import of gas from the states outside of EU. The main objective is to describe some important aspects of the co-operation with Russia as a strong partner of today and into the future regarding the gas supplies to EU. Another objective is an answer to a question what does mean liberalization and which influence it has on the energy politics of EU in context of EK Directive with respect to solving of problems with shortage of power, price increase and insufficient investment into the new recourses of energy and cross-border capacities, also the unsatisfactory co-operation between the states of EU in this problem. The future of the European energetic originally set if possible on the highest autonomy of delivery strikes against the problem of fossil fuel recourses decreasing. At the same time the world recourses of a crude oil are decreasing and their rest is estimated for the next 60 years. Considering this situation is the change of the prime fuel recourses structure for Europe unavoidable and actual. It is necessary to count on that the import European independence in the next 50 years will increase rapidly and the import of fuels will be absolutely dominative. The package of solutions which could help to overcome the future crisis is not big enough. The market liberalization with energy recourses of EU should make possible the access and competitive business to the smaller companies on this market and provide the similar market conditions which have oligopolies. In case of EU Member states there is necessary an energy solidarity that is just often discussed. The basic problem is that there should exist the common policy not only of energy but foreign affairs as well. The real progress won't be achieved if we don't accept the clear rules of behavior in energetic by each Government of the EU Member states. The solution I can see in case that we have a Constitution to enable unity in foreign and energy policy, so that reliability, security and stability of power and gas supplies would be sure. In my opinion making of the common energy policy will take a big engagement of all EU Member states and some more time.

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.