How Competition Benefits Consumers
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Monopolistic Competition in General Equilibrium: Beyond the CES Evgeny Zhelobodko, Sergey Kokovin, Mathieu Parenti, Jacques-François Thisse
Monopolistic competition in general equilibrium: Beyond the CES Evgeny Zhelobodko, Sergey Kokovin, Mathieu Parenti, Jacques-François Thisse To cite this version: Evgeny Zhelobodko, Sergey Kokovin, Mathieu Parenti, Jacques-François Thisse. Monopolistic com- petition in general equilibrium: Beyond the CES. 2011. halshs-00566431 HAL Id: halshs-00566431 https://halshs.archives-ouvertes.fr/halshs-00566431 Preprint submitted on 16 Feb 2011 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. WORKING PAPER N° 2011 - 08 Monopolistic competition in general equilibrium: Beyond the CES Evgeny Zhelobodko Sergey Kokovin Mathieu Parenti Jacques-François Thisse JEL Codes: D43, F12, L13 Keywords: monopolistic competition, additive preferences, love for variety, heterogeneous firms PARIS-JOURDAN SCIENCES ECONOMIQUES 48, BD JOURDAN – E.N.S. – 75014 PARIS TÉL. : 33(0) 1 43 13 63 00 – FAX : 33 (0) 1 43 13 63 10 www.pse.ens.fr CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE – ECOLE DES HAUTES ETUDES EN SCIENCES SOCIALES ÉCOLE DES PONTS PARISTECH – ECOLE NORMALE SUPÉRIEURE – INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE Monopolistic Competition in General Equilibrium: Beyond the CES∗ Evgeny Zhelobodko† Sergey Kokovin‡ Mathieu Parenti§ Jacques-François Thisse¶ 13th February 2011 Abstract We propose a general model of monopolistic competition and derive a complete characterization of the market equilibrium using the concept of Relative Love for Variety. -
Chapter 5 Perfect Competition, Monopoly, and Economic Vs
Chapter Outline Chapter 5 • From Perfect Competition to Perfect Competition, Monopoly • Supply Under Perfect Competition Monopoly, and Economic vs. Normal Profit McGraw -Hill/Irwin © 2007 The McGraw-Hill Companies, Inc., All Rights Reserved. McGraw -Hill/Irwin © 2007 The McGraw-Hill Companies, Inc., All Rights Reserved. From Perfect Competition to Picking the Quantity to Maximize Profit Monopoly The Perfectly Competitive Case P • Perfect Competition MC ATC • Monopolistic Competition AVC • Oligopoly P* MR • Monopoly Q* Q Many Competitors McGraw -Hill/Irwin © 2007 The McGraw-Hill Companies, Inc., All Rights Reserved. McGraw -Hill/Irwin © 2007 The McGraw-Hill Companies, Inc., All Rights Reserved. Picking the Quantity to Maximize Profit Characteristics of Perfect The Monopoly Case Competition P • a large number of competitors, such that no one firm can influence the price MC • the good a firm sells is indistinguishable ATC from the ones its competitors sell P* AVC • firms have good sales and cost forecasts D • there is no legal or economic barrier to MR its entry into or exit from the market Q* Q No Competitors McGraw -Hill/Irwin © 2007 The McGraw-Hill Companies, Inc., All Rights Reserved. McGraw -Hill/Irwin © 2007 The McGraw-Hill Companies, Inc., All Rights Reserved. 1 Monopoly Monopolistic Competition • The sole seller of a good or service. • Monopolistic Competition: a situation in a • Some monopolies are generated market where there are many firms producing similar but not identical goods. because of legal rights (patents and copyrights). • Example : the fast-food industry. McDonald’s has a monopoly on the “Happy Meal” but has • Some monopolies are utilities (gas, much competition in the market to feed kids water, electricity etc.) that result from burgers and fries. -
CONSUMER CHOICE 1.1. Unit of Analysis and Preferences. The
CONSUMER CHOICE 1. THE CONSUMER CHOICE PROBLEM 1.1. Unit of analysis and preferences. The fundamental unit of analysis in economics is the economic agent. Typically this agent is an individual consumer or a firm. The agent might also be the manager of a public utility, the stockholders of a corporation, a government policymaker and so on. The underlying assumption in economic analysis is that all economic agents possess a preference ordering which allows them to rank alternative states of the world. The behavioral assumption in economics is that all agents make choices consistent with these underlying preferences. 1.2. Definition of a competitive agent. A buyer or seller (agent) is said to be competitive if the agent assumes or believes that the market price of a product is given and that the agent’s actions do not influence the market price or opportunities for exchange. 1.3. Commodities. Commodities are the objects of choice available to an individual in the economic sys- tem. Assume that these are the various products and services available for purchase in the market. Assume that the number of products is finite and equal to L ( =1, ..., L). A product vector is a list of the amounts of the various products: ⎡ ⎤ x1 ⎢ ⎥ ⎢x2 ⎥ x = ⎢ . ⎥ ⎣ . ⎦ xL The product bundle x can be viewed as a point in RL. 1.4. Consumption sets. The consumption set is a subset of the product space RL, denoted by XL ⊂ RL, whose elements are the consumption bundles that the individual can conceivably consume given the phys- L ical constraints imposed by the environment. -
CHOICE – a NEW STANDARD for COMPETITION LAW ANALYSIS? a Choice — a New Standard for Competition Law Analysis?
GO TO TABLE OF CONTENTS GO TO TABLE OF CONTENTS CHOICE – A NEW STANDARD FOR COMPETITION LAW ANALYSIS? a Choice — A New Standard for Competition Law Analysis? Editors Paul Nihoul Nicolas Charbit Elisa Ramundo Associate Editor Duy D. Pham © Concurrences Review, 2016 GO TO TABLE OF CONTENTS All rights reserved. No photocopying: copyright licenses do not apply. The information provided in this publication is general and may not apply in a specifc situation. Legal advice should always be sought before taking any legal action based on the information provided. The publisher accepts no responsibility for any acts or omissions contained herein. Enquiries concerning reproduction should be sent to the Institute of Competition Law, at the address below. Copyright © 2016 by Institute of Competition Law 60 Broad Street, Suite 3502, NY 10004 www.concurrences.com [email protected] Printed in the United States of America First Printing, 2016 Publisher’s Cataloging-in-Publication (Provided by Quality Books, Inc.) Choice—a new standard for competition law analysis? Editors, Paul Nihoul, Nicolas Charbit, Elisa Ramundo. pages cm LCCN 2016939447 ISBN 978-1-939007-51-3 ISBN 978-1-939007-54-4 ISBN 978-1-939007-55-1 1. Antitrust law. 2. Antitrust law—Europe. 3. Antitrust law—United States. 4. European Union. 5. Consumer behavior. 6. Consumers—Attitudes. 7. Consumption (Economics) I. Nihoul, Paul, editor. II. Charbit, Nicolas, editor. III. Ramundo, Elisa, editor. K3850.C485 2016 343.07’21 QBI16-600070 Cover and book design: Yves Buliard, www.yvesbuliard.fr Layout implementation: Darlene Swanson, www.van-garde.com GO TO TABLE OF CONTENTS ii CHOICE – A NEW STANDARD FOR COMPETITION LAW ANALYSIS? Editors’ Note PAUL NIHOUL NICOLAS CHARBIT ELISA RAMUNDO In this book, ten prominent authors offer eleven contributions that provide their varying perspectives on the subject of consumer choice: Paul Nihoul discusses how freedom of choice has emerged as a crucial concept in the application of EU competition law; Neil W. -
Competitive Supply of Money in a New Monetarist Model
Munich Personal RePEc Archive Competitive Supply of Money in a New Monetarist Model Waknis, Parag 11 September 2017 Online at https://mpra.ub.uni-muenchen.de/75401/ MPRA Paper No. 75401, posted 23 Sep 2017 10:12 UTC Competitive Supply of Money in a New Monetarist Model Parag Waknis∗ September 11, 2017 Abstract Whether currency can be efficiently provided by private competitive money suppliers is arguably one of the fundamental questions in monetary theory. It is also one with practical relevance because of the emergence of multiple competing financial assets as well as competing cryptocurrencies as means of payments in certain class of transactions. In this paper, a dual currency version of Lagos and Wright (2005) money search model is used to explore the answer to this question. The centralized market sub-period is modeled as infinitely repeated game between two long lived players (money suppliers) and a short lived player (a continuum of agents), where longetivity of the players refers to the ability to influence aggregate outcomes. There are multiple equilibria, however we show that equilibrium featuring lowest inflation tax is weakly renegotiation proof, suggesting that better inflation outcome is possible in an environment with currency competition. JEL Codes: E52, E61. Keywords: currency competition, repeated games, long lived- short lived players, inflation tax, money search, weakly renegotiation proof. ∗The paper is based on my PhD dissertation completed at the University of Connecticut (UConn). I thank Christian Zimmermann (Major Advisor, St.Louis Fed), Ricardo Lagos (Associate Advisor, NYU) and Vicki Knoblauch (Associate Advisor, UConn) for their guidance and support. I thank participants at various conferences and the anonymous refer- ees at Economic Inquiry for their helpful comments and suggestions. -
Lecture Notes General Equilibrium Theory: Ss205
LECTURE NOTES GENERAL EQUILIBRIUM THEORY: SS205 FEDERICO ECHENIQUE CALTECH 1 2 Contents 0. Disclaimer 4 1. Preliminary definitions 5 1.1. Binary relations 5 1.2. Preferences in Euclidean space 5 2. Consumer Theory 6 2.1. Digression: upper hemi continuity 7 2.2. Properties of demand 7 3. Economies 8 3.1. Exchange economies 8 3.2. Economies with production 11 4. Welfare Theorems 13 4.1. First Welfare Theorem 13 4.2. Second Welfare Theorem 14 5. Scitovsky Contours and cost-benefit analysis 20 6. Excess demand functions 22 6.1. Notation 22 6.2. Aggregate excess demand in an exchange economy 22 6.3. Aggregate excess demand 25 7. Existence of competitive equilibria 26 7.1. The Negishi approach 28 8. Uniqueness 32 9. Representative Consumer 34 9.1. Samuelsonian Aggregation 37 9.2. Eisenberg's Theorem 39 10. Determinacy 39 GENERAL EQUILIBRIUM THEORY 3 10.1. Digression: Implicit Function Theorem 40 10.2. Regular and Critical Economies 41 10.3. Digression: Measure Zero Sets and Transversality 44 10.4. Genericity of regular economies 45 11. Observable Consequences of Competitive Equilibrium 46 11.1. Digression on Afriat's Theorem 46 11.2. Sonnenschein-Mantel-Debreu Theorem: Anything goes 47 11.3. Brown and Matzkin: Testable Restrictions On Competitve Equilibrium 48 12. The Core 49 12.1. Pareto Optimality, The Core and Walrasian Equiilbria 51 12.2. Debreu-Scarf Core Convergence Theorem 51 13. Partial equilibrium 58 13.1. Aggregate demand and welfare 60 13.2. Production 61 13.3. Public goods 62 13.4. Lindahl equilibrium 63 14. -
Real Business Cycles
Real Business Cycles JesusFernandez-Villaverde University of Pennsylvania 1 Business Cycle U.S. economy uctuates over time. How can we build models to think about it? Do we need di erent models than before to do so? Traditionally the answer was yes. Nowadays the answer is no. We will focus on equilibrium models of the cycle. 2 Business Cycles and Economic Growth How di erent are long-run growth and the business cycle? Changes in Output per Worker Secular Growth Business Cycle Due to changes in capital 1/3 0 Due to changes in labor 0 2/3 Due to changes in productivity 2/3 1/3 We want to use the same models with a slightly di erent focus. 3 Stochastic Neoclassical Growth Model Cass (1965) and Koopmans (1965). Brock and Mirman (1972). Kydland and Prescott (1982). Hansen (1985). King, Plosser, and Rebelo (1988a,b). 4 References King, Plosser, and Rebelo (1988a,b). Chapter by Cooley and Prescott in Cooley's Frontier of Business Cycle Research (in fact, you want to read the whole book). Chapter by King and Rebelo (Resurrection Real Business Cycle Mod- els) in Handbook of Macroeconomics. Chapter 12 in Ljungqvist and Sargent. 5 Preferences Preferences: 1 t t t t E0 (1 + n) u ct s ; lt s tX=0 t t for ct s 0; lt s (0; 1) 2 where n is population growth. Standard technical assumptions (continuity, di erentiability, Inada con- ditions, etc...). However, those still leave many degrees of freedom. Restrictions imposed by economic theory and empirical observation. 6 Restrictions on Preferences Three observations: 1. -
The Meaning of Competition*
HAYEK The Meaning of Competition* Friedrich A. Hayek LINK TO ABSTRACT I. There are signs of increasing awareness among economists that what they have been discussing in recent years under the name of ‘competition’ is not the same thing as what is thus called in ordinary language. But, although there have been some valiant attempts to bring discussion back to earth and to direct attention to the problems of real life, notably by J. M. Clark and Fritz Machlup,1 the general view seems still to regard the conception of competition currently employed by economists as the significant one and to treat that of the businessman as an abuse. It appears to be generally held that the so-called theory of ‘perfect competition’ provides the appropriate model for judging the effectiveness of competition in real life and that, to the extent that real competition differs from that model, it is undesirable and even harmful. For this attitude there seems to me to exist very little justification. I shall attempt to show that what the theory of perfect competition discusses has little claim to be called ‘competition’ at all and that its conclusions are of little use as guides to policy. The reason for this seems to me to be that this theory throughout assumes that state of affairs already to exist which, according to the truer view of the older theory, the process of competition tends to bring about (or to approxi- mate) and that, if the state of affairs assumed by the theory of perfect competition * This essay reproduces the substance of the Stafford Little Lecture delivered at Princeton University on May 20, 1946. -
Modern Monetary Theory: a Marxist Critique
Class, Race and Corporate Power Volume 7 Issue 1 Article 1 2019 Modern Monetary Theory: A Marxist Critique Michael Roberts [email protected] Follow this and additional works at: https://digitalcommons.fiu.edu/classracecorporatepower Part of the Economics Commons Recommended Citation Roberts, Michael (2019) "Modern Monetary Theory: A Marxist Critique," Class, Race and Corporate Power: Vol. 7 : Iss. 1 , Article 1. DOI: 10.25148/CRCP.7.1.008316 Available at: https://digitalcommons.fiu.edu/classracecorporatepower/vol7/iss1/1 This work is brought to you for free and open access by the College of Arts, Sciences & Education at FIU Digital Commons. It has been accepted for inclusion in Class, Race and Corporate Power by an authorized administrator of FIU Digital Commons. For more information, please contact [email protected]. Modern Monetary Theory: A Marxist Critique Abstract Compiled from a series of blog posts which can be found at "The Next Recession." Modern monetary theory (MMT) has become flavor of the time among many leftist economic views in recent years. MMT has some traction in the left as it appears to offer theoretical support for policies of fiscal spending funded yb central bank money and running up budget deficits and public debt without earf of crises – and thus backing policies of government spending on infrastructure projects, job creation and industry in direct contrast to neoliberal mainstream policies of austerity and minimal government intervention. Here I will offer my view on the worth of MMT and its policy implications for the labor movement. First, I’ll try and give broad outline to bring out the similarities and difference with Marx’s monetary theory. -
Advanced Economic Analysis for Competition Enforcement 16 – 18 July 2018 DRAFT COURSE OUTLINE
4th ANNUAL COMPETITION AND ECONOMIC REGULATION (ACER) WEEK Advanced economic analysis for competition enforcement 16 – 18 July 2018 DRAFT COURSE OUTLINE Targeted at experienced competition economists from authorities, regulators, public and private sector firms and private practice, this intensive Professional Training Programme (PTP) will cover the latest developments in economic theory and their application to the analysis of competition cases. This PTP will cover frameworks for understanding abuse of dominance, coordinated conduct and mergers from theoretical and practical perspectives. It will equip participants with the specialist knowledge and skills required to undertake rigorous economic analysis in competition cases. The course will be facilitated by Dr Javier Tapia (Judge at the Competition Tribunal of the Republic of Chile and a senior researcher at Regcom, the Centre for Regulation and Competition at Universidad de Chile, Faculty of Law), Prof Liberty Mncube (Chief Economist at the Competition Commission of South Africa, Visiting Associate Professor of Economics, University of Witwatersrand and Honorary Professor of Economics, University of Stellenbosch), Dr Andrea Amelio (part of the European DG COMP’s Chief Economist Team) and Ms Reena das Nair, Senior Lecturer in the College of Business and Economics and Senior Researcher at the Centre for Competition, Regulation and Economic Development (CCRED) at the University of Johannesburg. Approach The PTP will be taught primarily by means of lectures, which will draw on international and South African examples and precedent-setting cases with a strong focus on underlying economic principles. The lectures will be complemented by case study exercises involving analysis of data and fact patterns by different groups who will present findings in feedback sessions. -
The Meaning of Competition · Econ Journal Watch : Discovery,Reputation,Monopoly
Discuss this article at Journaltalk: http://journaltalk.net/articles/5923 ECON JOURNAL WATCH 13(2) May 2016: 359–372 Foreword to “The Meaning of Competition” In certain chambers there echo tales of men who justify free enterprise and liberalization with perfect competition and other phantasms. Yet scarcely ever have there been such men, ones of straw aside. As Friedrich A. Hayek suggests in the essay republished here, and as superbly elaborated by Frank M. Machovec in Perfect Competition and the Transformation of Economics (Routledge, 1995), those who would bridle and fetter voluntary enterprise are, in fact, the ones who, double in their stan- dards of failure, rely most on perfect competition. If you know persons entering into such echo chambers, the following may help to save them from themselves, and the rest of us. Daniel B. Klein May 2016 VOLUME 13, NUMBER 2, MAY 2016 359 HAYEK The Meaning of Competition* Friedrich A. Hayek LINK TO ABSTRACT I. There are signs of increasing awareness among economists that what they have been discussing in recent years under the name of ‘competition’ is not the same thing as what is thus called in ordinary language. But, although there have been some valiant attempts to bring discussion back to earth and to direct attention to the problems of real life, notably by J. M. Clark and Fritz Machlup,1 the general view seems still to regard the conception of competition currently employed by economists as the significant one and to treat that of the businessman as an abuse. It appears to be generally held that the so-called theory of ‘perfect competition’ provides the appropriate model for judging the effectiveness of competition in real life and that, to the extent that real competition differs from that model, it is undesirable and even harmful. -
General Equilibrium Concepts Under Imperfect Competition: a Cournotian Approach∗
General Equilibrium Concepts under Imperfect Competition: A Cournotian Approach∗ Claude d'Aspremont,y Rodolphe Dos Santos Ferreiraz and Louis-Andr´eG´erard-Varetx Received May 14, 1993; revised March 21, 1996 Abstract In a pure exchange economy we propose a general equilibrium concept under imperfect competition, the \Cournotian Monopolistic Competition Equilibrium", and compare it to the Cournot-Walras and the Monopolistic Competition concepts. The advantage of the proposed concept is to require less computational ability from the agents. The comparison is made first through a simple example, then through a more abstract concept, the P -equilibrium based on a general notion of price coordination, the pricing-scheme. Journal of Economic Literature Classification Numbers: D5, D43 ∗Reprinted from Journal of Economic Theory, 73, 199{230, 1997. Financial Support from the European Commission HCM Programme and from the Belgian State PAI Programme (Prime Minister's Office, Science Policy Programming) is gratefully acknowledged. yCORE, Universit´ecatholique de Louvain, 34 voie du Roman Pays, 1348-Louvain-la-Neuve, Belgium zBETA, Universit´eLouis Pasteur, 38 boulevard d'Anvers, 67000-Strasbourg, France xGREQE, Ecole des Hautes Etudes en Sciences Sociales, F-13002-Marseille, France. 1 1 Introduction The formal simplicity of general equilibrium theory under perfect competition and of its assump- tions on the individual agents' characteristics, can easily be contrasted with the complexity and the ad hoc assumptions of the general analysis of imperfect competition. However the simplic- ity of general competitive analysis is all due to a single behavioral hypothesis, namely that all sellers and buyers take prices as given. This price-taking hypothesis allows for a clear notion of individual rationality, based on the simplest form of anticipations (rigid ones) and an exoge- nous form of coordination (the auctioneer).