Lecture Notes for 1st Year Ph.D. Game Theoryâ Navin Kartikâ 1 Introduction Game theory is a formal methodology and a set of techniques to study the interaction of rational agents in strategic settings. Therefore the valuation functions of the dynastic model are not only the optimal solution to the problem given the state variables for the individual, but they are the best response valuation functions given the spouse's choice. 58 (1996): 209-237 Algorithmic Game Theory, edited by N. Nisan, T. Roughgarden, E. ... Markov strategies and Markov perfect equilibrium. We will focus on settings with â¢ two players Markov perfect equilibrium is a key notion for analyzing economic problems involving dy-namic strategic interaction, and a cornerstone of applied game theory. 0000001111 00000 n (SPE doesnât suer from this problem in the context of a bargaining game, but many other games -especially repeated games- contain a large number of SPE.) Properties of the equilibrium Existence of a pure strategy equilibrium: { Continuity of the scrap value and entry cost distributions ensure the existence of unique entry/exit strategies in probability space (i.e. 0000008678 00000 n (see link at syllabus). We will focus on â¦ MS&E 336 Lecture 4: Stochastic games Ramesh Johari April 16, 2007 In this lecture we deï¬ne stochastic games and Markov perfect equilibrium. 0000036600 00000 n 5 0 obj 0000021298 00000 n 0000033506 00000 n In this lecture, we teach Markov perfect equilibrium by example. Markov perfect equilibrium has the same characteristics as a sequential equilibrium, except that a player maximizes only over the class of Markov strategies. We will focus on settings with â¢ two players A Markov Model is a stochastic model which models temporal or sequential data, i.e., data that are ordered. 0000020565 00000 n In this lecture, we teach Markov perfect equilibrium by example. trailer << /Size 981 /Info 925 0 R /Root 950 0 R /Prev 837056 /ID[<62eec4afaf8ef2a98a55bf5cfc2e1394>] >> startxref 0 %%EOF 950 0 obj << /Type /Catalog /Pages 924 0 R /Metadata 926 0 R /StructTreeRoot 952 0 R /AcroForm 951 0 R >> endobj 951 0 obj << /Fields [ ] /DR << /Font << /ZaDb 521 0 R /Helv 522 0 R >> /Encoding << /PDFDocEncoding 523 0 R >> >> /DA (/Helv 0 Tf 0 g ) >> endobj 952 0 obj << /Type /StructTreeRoot /K 524 0 R /ParentTree 626 0 R /ParentTreeNextKey 98 >> endobj 979 0 obj << /S 4182 /T 4353 /V 4506 /C 4528 /Filter /FlateDecode /Length 980 0 R >> stream 0000032031 00000 n 0000007928 00000 n This lecture describes the concept of Markov perfect equilibrium. 0000005311 00000 n MARKOV STRATEGIES AND MARKOV PERFECT EQUILIBRIUM Let G be a game with n players (indexed by i=1,..., n) and T periods (indexed by t=1,..., T), where T can be finite or infinite. 3 Markov Perfect Equilibria We will characterize the MPE for the cases in which T = 1and the T <1separately, and in doing so, we will illustrate two common techniques for solving such problems. <> Markov Perfect Equilibria Now itâ¢s time to enforce the fact that s describes equilibrium behavior (i.e. 0000004888 00000 n 12 September:Gains from New Variety (Lecture Note)Applications of AIDS. Computation In this lecture we teach Markov perfect equilibrium by â¦ An adequate concept of solution is Nash equilibrium, which prevents unilateral deviations of the players from its recommendation of play. stream This version: October 1, 2002. Markov Perfect Equilibrium: any resources? 0000012629 00000 n 0000004911 00000 n â¢ Matt Shumâs notes are also pretty helpful â¢ This lecture will examine concentration in a structure with ... â¢ Deï¬ne a Markov-perfect equilibrium The class notes available on the web. Markov perfect equilibrium is a key notion for analyzing economic problems involving dynamic strategic interaction, and a cornerstone of applied game theory. rrk&X�'$I��y���u|L�#&u9�A�n5�H#C�/��njh���_R�:�Dc��Y=t��:/�l�"}UB�;�� �i�n�?Y�������(�Y�/������= ��Z�����E�n�2�4�9�KWJ�F!#&PR~ ,��:C���_��4���c+�e�J�g;���￭�� N�-i��z3�E9�d6�3 q����ϳ|��C�. of the Nash equilibrium solution like Seltenâs subgame perfect equilibrium (1965) and perfect equilibrium (1975), Harsanyiâs Bayesian Nash equilibrium (1967-68), or Kreps and Wilsonâs sequential equilibrium (1982) have proved essential to the modern analysis of â¦ The Markov Perfect Equilibrium (MPE) concept is a drastic renement of SPE developed as a reaction to the multiplicity of equilibria in dynamic problems. 1 Stochastic Games A (discounted) stochastic game with N players consists of the following elements. Also, the models in last lecture (divide-and-rule and politics of fear) use Markov Perfect Equilibrium, so itâs helpful to review those. Chapter. More precisely, it is measurable with respect to the coarsest partition of histories for which, if all other players use measurable strategies, each player's decision-problem is also measurable. 0000008166 00000 n Econometrica, 69(5):1261{1281. 0000032288 00000 n As a corollary to Theorem 1, we know that a stationary Markov perfect equilibrium exists in a stochastic game with endogenous shocks. Keywords: Optimal taxation, Time-consistency, Markov perfect equilibrium. 0000005497 00000 n Peace war game is an iterated game originally played in academic groups and by computer simulation for years to study possible strategies of cooperation and aggression. 0000001262 00000 n %PDF-1.3 0000008404 00000 n We define Markov strategy and Markov perfect equilibrium (MPE) for games with observable actions. 0000000991 00000 n This lecture describes the concept of Markov perfect equilibrium. Computation and Recent Progress Lecture Note â *Pakes, A. and McGuire, P., "Stochastic Algorithms, Symmetric Markov-Perfect Equilibrium, and the Curse of â¦ As for the future, it is usually appraised in discounted fashion: the further away in the future the less it matters in present decisions. A state space X â¦ Informally, a Markov strategy depends only on payoff-relevant past events. 0000033922 00000 n ), The Economics of New Goods, NBER Studies in Income and Wealth vol. ���y������M��~�G���"q�I�@��tI__����5a�W$\;�*P�C>]'`&�LZ���#n8��I q��1���)�O����Q�-AE��(����O�N2H���ո\�]�$߭T���[� Y%���ڤ9�̬֎��)9�c������v�)�*��kAh�,�8��S�9�ǅ�̬J)�c- p�����[p�`��-��u�ydfd!ba��� 6|�c"Ҍ���w�Pϛ��yj��0�@�idU�aڈ�qDb�.�a����%?�P�b���d�,����1_&��r8���%jRI �B�H����h4�*���m��W�Nm���C�8@/K��OaH�icJxc�� weather) with previous information. Ericson, R. and Pakes, A., âMarkov-Perfect Industry Dynamics: A Framework for Empirical Workâ, The Review of Economic Studies, 62 (1), 1995, 53-82. This lecture describes the concept of Markov perfect equilibrium. x��=َ$�q���W���mp�yCA�$��6`�a�'�8�$5� ��UyU�\k�fM��qGd��1Ƀ������ׯ���q�5�����I �?O��x����������E�-^��0�������ӥ���*��?�og�V�/O���IFu�'�]K/�閟���0_��i'�L����4I����o�$�y|J�m��?�xJ*��Z���'�&�]�~� m�Q�ߍ�(֦��.��S�f��y��|i�+>0|V�(i�o��߮�x����b���;-(H_��)��OaaM����N�@9�.g�]J3cb��Wy�G�F���3��*���|�M�����n=�W�Sy�W�L�q��ò�f�v�i���V�������+���,�W�|���A�����_��_>���� ?{�88"���ͅ5V�/�/�8���#��-�*�DO`� �f(����������c�l�EȘ� �`6����TH���$�i�ڲX7v��֟l��lA|q�|��1� JEL classiï¬cation: E62, H21. Markov perfect equilibrium is a key notion for analyzing economic problems involving dynamic strategic interaction, and a cornerstone of applied game theory. It provides a way to model the dependencies of current information (e.g. Lecture 1 Evolution of Market Concentration â¢ Take a look at : Doraszelski and Pakes, âA Framework for Applied Dynamic Analysis in IO,â Handbook of I.O. H�|TmL[����_8�c��;q�]. It is composed of states, transition scheme between states, â¦ Applications of BLP. Game Theory: Lecture 1 Games with Incomplete Information and Introduction to Mechanisms { As long the p 0000008445 00000 n 949 0 obj << /Linearized 1 /O 953 /H [ 1366 3545 ] /L 856166 /E 82350 /N 98 /T 837067 >> endobj xref 949 32 0000000016 00000 n 3. Numerical solution: Introduction The Ericson-Pakes framework can generate rich patterns of industry ... Stochastic algorithms, symmetric Markov perfect equilibrium, and the âcurseâ of dimensionality. Markov perfect equilibrium (MPE). 0000051492 00000 n As peace makers became richer over time it became clear that making war had greater costs than initially anticipated. 0000001366 00000 n 0000036725 00000 n âRationalâ here means the standard thing in economics: This lecture describes the concept of Markov perfect equilibrium. It is a refinement of the concept of subgame perfect equilibrium to extensive form games for â¦ 0000022520 00000 n Readings: Hausman, Jerry, âValuation of New Goods Under Perfect and Imperfect Competition,â in Bresnahan and Gordon (eds. Consequently, this recitation will be mostly about game theory, and less about political economy. Since the data is generated by one speci c equilibrium, i(a imjX m;Po) is the ... { A Markov Perfect Equilibirum in probability space is then de ned as a xed point of the CCP mapping: P i â¦ These lecture notes will discuss all these successive advances as well as many of their applications. 0000022960 00000 n 0000009892 00000 n We model couples decisions as a noncooperative game and solve for a Markov Perfect Equilibrium (MPE) in pure strategies. %PDF-1.4 %���� In every period t, each player i chooses an action ai tin his or her finite action space, where this space may depend on actions chosen in earlier periods. %�쏢 The seminal ideas of Ramsey (1927) were ï¬rst applied to the growth âSubmitted: 7 December 2001. In this lecture, we teach Markov perfect equilibrium by example. 0000066142 00000 n 1. 1 Relational Contracts In the previous moral hazard models, we require y{the dollar value of the agentâs contribution to the rm{to be observable,ex ante describable and ex post veri able.However, for most principals, it is extremely di cult to measure y in a way that would allow the agentâs pay to be based on ythrough a compensation contract that could be enforced by a court, if Motivation Gopinath, Itskhoki and Neiman (2011)-1-0.5 0 0.5 1 3 2.5 2 1.5 1 0.5 0 Change in log values IMPORTS-0.75-0.5-0.25 0 0.25 0.5 0.75 10 8 6 4 2 0 4.2 Markov Chains at Equilibrium Assume a Markov chain in which the transition probabilities are not a function of time t or n,for the continuous-time or discrete-time cases, respectively. 12. I am trying to learn more about Markov Perfect Equilibrium: could anyone link me to books, lecture notesâ¦ Definition 2 MPNE. 0000005124 00000 n Markov perfect equilibrium is a key notion for analyzing economic problems involving dy-namic strategic interaction, and a cornerstone of applied game theory. This defines a homogeneous Markov chain. Lecture 3: Computing Markov Perfect Equilibria April 22, 2015 1/19. Theorem 2 extends Theorem 1 by including an atomic part in the transition probability, and covers the main existence result in as a special case. itâ¢s a best response) DEFINITION: A stationary Markov perfect equilibrium (MPE) in this game is a set of strategy functions s such that for any ârm i and any (x,# i) 2X RJ+1 s â¦ A Markov perfect equilibrium is an equilibrium concept in game theory. 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