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The QSMS Research Group organises research seminars on a regular basis with presentations by top researchers at an international level.

The seminars take place at 12:15-13:45 in room A406 in Building Q, Budapest University of Technology and Economics, Faculty of Economic and Social Sciences, Magyar tudósok körútja 2, 1117 Budapest. At the seminars sandwiches are provided. Please help the organisers by registering in advance.  Registration is free.

January 27:  Eleftheria Triviza  (QSMS Job Market Seminar)

Eleftheria Triviza (University of Mannheim) will present her Job Market Paper “Optimal Pricing Scheme for Addictive Goods on January 27th at 10 AM, room QA 406 (note the room change). One-to-one meetings with the speaker can be arranged; please contact the seminar organizers, Dr. Noémie Cabau (cabau.noemie@gtk.bme.hu) and Dr. Arseniy Samsonov(samsonov.arseniy@gtk.bme.hu).  

Abstract:   

This article analyses how consumers’ habit formation and addiction affect firms’ pricing policies. I consider both sophisticated consumers, who realize that their current consumption will affect future tastes, and “naive” consumers, who do not. The optimal contract for sophisticated consumers is a two-part tariff. The main result is that the optimal pricing pattern when the consumer is naive is a “bargain then rip-off” contract, namely a fixed fee, with the first units priced below cost, and then priced above marginal cost. This holds both under symmetric and asymmetric information about the consumers’ degree of sophistication. 

January 17:  Philipp Külpmann  (QSMS Job Market Seminar)

Philipp Külpmann (University of Vienna) will be presenting his Job Market Paper “Identifying the reasons for coordination failure in a laboratory experiment  (co-authored with Davit Khantadze, ISET, Tbilisi State University) on January 19th at 10 AM, room QA 406 (note the room change). One-to-one meetings with the speaker can be arranged; please contact the seminar organizers, Dr. Noémie Cabau (cabau.noemie@gtk.bme.hu) and Dr. Arseniy Samsonov (samsonov.arseniy@gtk.bme.hu).  

Abstract:   

We investigate the effect of the absence of common knowledge on the outcomes of coordination games in a laboratory experiment. Using cognitive types, we can explain coordination failure in pure coordination games while differentiating between coordination failure due to first- and higher-order beliefs. In our experiment, around 76% of the players chose the payoff-dominant equilibrium strategy despite the absence of common knowledge. However, 9.33% of the players had first-order beliefs that led to coordination failure, and another 9.33% exhibited coordination failure due to higher-order beliefs. 

December 13:  Steven Kivinen  (QSMS Seminar)

Steven Kivinen (University of Graz) will be presenting his paper “On the Manipulability of Equitable Voting Rules  on December 13th at 10 AM, room QA 405. One-to-one meetings with the speaker can be arranged; please contact the seminar organizers, Dr. Noémie Cabau (cabau.noemie@gtk.bme.hu) and Dr. Arseniy Samsonov (samsonov.arseniy@gtk.bme.hu).  

Abstract:   

We consider the equity-manipulability trade-off when voting over two alternatives. Pairwise equity is a weakening of anonymity requiring certain permutations of the voters’ identities to preserve the outcome of the election. l-robust group strategy-proofness (l-RGSP) and fine robust group strategy-proofness (FRGSP) are notions of group strategy-proofness that allow voters to have different beliefs about players’ types (Kivinen and Tumennasan, 2021). Our main results show that, under mild conditions, for pairwise equitable voting rules anonymity is equivalent to 2-RGSP, 3-RGSP, and FRGSP. In this way, anonymity is special in its equity and non-manipulability. These results follow from several preliminary results, one of which equates 2-RGSP to comonotonicity and swap-robustness. Finally, we consider the manipulability of k-unanimous rules, and 2-RGSP when agents can be indifferent and abstain.

December 6:  Mats Köster  (QSMS Seminar)

Mats Köster (Central European University, Vienna) will be presenting his paper “Conversations (co-authored with Paul Voss) on December 6th at 10 AM, room QA 405. One-to-one meetings with the speaker can be arranged; please contact the seminar organizers, Dr. Noémie Cabau (cabau.noemie@gtk.bme.hu) and Dr. Arseniy Samsonov (samsonov.arseniy@gtk.bme.hu).  

Abstract:   We develop a theory of conversations. Two agents with different interests take turns choosing the topic of the conversation. Talking about a single topic allows to delve deeper, making the conversation more informative (or enjoyable). To capture this, we assume that the marginal utility from conversing increases when the agents stay on topic. The equilibrium conversation is extreme: it either maximizes or minimizes welfare. Long conversations tend to be deep and thus efficient. Short ones are often superficial. The topic of a deep conversation depends in subtle ways on who speaks when. Applications range from echo chambers to team production. 

November 29:  Toygar Kerman  (QSMS Seminar)

Toygar Kerman (Corvinus University) will be presenting his paper “Persuading Communicating Voters (co-authored with Anastas P. Tenev)) on November 29th at 10 AM, room QA 3rd floor conference roomn. One-to-one meetings with the speaker can be arranged; please contact the seminar organizers, Dr. Noémie Cabau (cabau.noemie@gtk.bme.hu) and Dr. Arseniy Samsonov (samsonov.arseniy@gtk.bme.hu).  

Abstract:  We study a multiple-receiver Bayesian persuasion model in which the sender wants to implement a proposal and commits to a signal which sends correlated messages to multiple receivers who have homogeneous beliefs. Receivers are connected in a network and can perfectly observe their direct neighbors’ messages. After updating their beliefs, receivers vote for or against the proposal. The setup with limited information spillovers creates a significant complication in designing optimal signals. We simplify the sender’s problem by providing partial characterizations for optimal communication and consider applications which are characterized by distinct patterns of voter interaction. We show that the sender can achieve the upper bound of the value (i.e. the case with no spillovers) in most of the applications. Surprisingly, more communication among the receivers can even be strictly better for the sender and hence strictly worse for the voters. 

November 22:  Robert Schmidt  (QSMS Seminar)

 Robert Schmidt (University of Hagen) will be presenting his paper “On the timing of moves in two-player games (co-authored with Leanne Streekstra, Larry Karp, and Leo Simon) on November 22nd at 10 AM, room QA405. One-to-one meetings with the speaker can be arranged; please contact the seminar organizers, Dr. Noémie Cabau (cabau.noemie@gtk.bme.hu) and Dr. Arseniy Samsonov (samsonov.arseniy@gtk.bme.hu).  

Abstract:  We analyze two-player games in continuous time in which each player is free to decide when to move and what action to implement. The number of moves per player is restricted to (at most) one. We arrive at sharp predictions about the equilibrium outcome in certain classes of games, for which we can predict the timing of players’ moves, as well as the identity of the leader in a unique equilibrium outcome with sequential moves. This includes games with a second-mover advantage and non-trivial action sets that are traditionally analyzed in static settings. We illustrate the strength of our general modeling framework by applying it to canonical games from industrial economics and political economics such as price competition, and electoral competition where candidates differ in their “valence”.

Postdoctoral researcher with possibility of tenure as assistant professor (Q22)

The Faculty of Economic and Social Sciences (GTK) of the Budapest University of Technology and Economics (BME) invites applications for two full-time postdoctoral research positions at the Quantitative Social and Management Sciences Research Centre starting in the fall of 2023 at the latest.

Research Fields of interest: Game Theory, Evolutionary Game Theory, Signalling Theory, Reciprocity Theory, Economic Theory, Industrial Organization, Management, Platform Economics, Production Management, Operations Research, Social Choice Theory, Sustainable Development, Energy Economics, Apportionment, Network- and Experimental Economics and other quantitative fields and topics.
Applicants should have a PhD degree before taking up the position. The duration of the postdoctoral positions is three years. During this time, postdocs have the possibility to get involved in the teaching and other activities of the various departments and obtain tenure there: we expect to have 1 or more openings in 2026. We offer favourable conditions regarding research facilities, data access, time devoted to research, travel support, etc. While the position is research only, there will be opportunities to teach at the graduate level.
The Faculty of Economic and Social Sciences is the youngest faculty of the Budapest University of Technology and Economics, comprising various departments and study programmes. BME is a widely-acclaimed institute of technology and the world’s oldest technical university celebrating its 240th academic year.

Application Procedure
: Interviews will be conducted virtually 12-15 December 2022. Applications consisting of a motivation letter, CV, 3 referee letters and the job market paper must be submitted online at http://www.econjobmarket.org.
Deadline: The search amongst applicants will start on 15 November 2022 and continues until the positions are filled. For the job market, only applications received no later than 5 December 2022 will be considered.
Further information: Questions, but not applications, can be sent to egervari.zsuzsanna.@gtk.bme.hu.

October 25: Sreoshi Banerjee (QSMS Seminar)

Sreoshi Banerjee (QSMS Research Group, BME)  will be presenting her paper “GENERALIZED WELFARE LOWER BOUNDS AND STRATEGYPROOFNESS IN
SEQUENCING PROBLEMS  on October 25th at 10 AM, room QA405. One-to-one meetings with the speaker can be arranged; please contact the seminar organizers, Dr. Noémie Cabau (cabau.noemie@gtk.bme.hu) and Dr. Arseniy Samsonov (samsonov.arseniy@gtk.bme.hu).  

Abstract:  In an environment with private information, we study the class of sequencing problems with welfare lower bounds. The ‘generalized welfare lower bound’ is a universal representation of some of the specific lower bounds that have been previously studied in the literature. Every agent is offered protection in the form of a minimum guarantee on their utilities. We provide a necessary and sufficient condition to identify an outcome-efficient and strategyproof mechanism that satisfies the generalized welfare lower bound. We then characterize the entire class of mechanisms that satisfy outcome efficiency, strategyproofness, and generalized welfare lower bound. These are termed as ‘relative pivotal mechanisms’. Our paper proposes relevant theoretical applications namely; ex-ante initial order, identical costs bound and expected cost bound. We also give insights on the issues of feasibility and/or budget balance. 

October 18: Ryan Tierney (QSMS Seminar)

Ryan Tierney from the University of Southern Denmark will be presenting his paper “Crowding in School Choice on October 18th at 10 AM, room QA405. One-to-one meetings with the speaker can be arranged; please contact the seminar organizers, Dr. Noémie Cabau (cabau.noemie@gtk.bme.hu) and Dr. Arseniy Samsonov (samsonov.arseniy@gtk.bme.hu).  

Abstract:  We consider the market design problem of matching students to schools in the presence of crowding effects. These effects are salient in parents’ decision making and the empirical literature; however, they cause major difficulties in the design of satisfactory mechanisms and, as such, are not currently considered. We propose a new framework and an equilibrium notion that accommodates crowding, no-envy, and respect for priorities. The equilibrium has a student-optimal element that induces an incentive compatible mechanism and is implementable via a novel algorithm. Moreover, analogs of fundamental structural results of the matching literature—the Rural Hospitals Theorem, welfare lattice, etc.—survive.

October 11: Vivien Surman (QSMS Seminar)

Vivien Surman from BME, Management department, will be presenting her paper “Characterizing clusters of students and supervisors based on an empirical study in the case of project work courses on October 11th at 10 AM, room QA405. One-to-one meetings with the speaker can be arranged; please contact the seminar organizers, Dr. Noémie Cabau (cabau.noemie@gtk.bme.hu) and Dr. Arseniy Samsonov (samsonov.arseniy@gtk.bme.hu).  

Abstract:  The purpose of this research is to describe the different clusters of students completing project work courses and to characterize lecturers acting as supervisors as well. The existence of different student groups setting different requirements against the supervising process has been emerged by supervisor focus group interviews in the improvement process of a service quality framework for project work courses. Cluster analyses based upon data from this service quality framework have proved the presence of three well-definable student groups. At the same time, the specific attributes of the supervisors including age, experience, grade distribution have also been gathered and analysed. The student classification is based on feedbacks of 1500 students. Supervisor characterization results from the analyses of 800 previously finished project work courses. As a result, it could be confirmed that both the students and the supervisors could be classified into well-defined groups in the case of project work courses. Finally, the characteristics of the identified groups of students and that of supervisors have been compared with statistical methods, highlighting connections between the groups. As these project work courses are remarkable cornerstones of total higher education student experience, characterizing the service quality features of the supervision process is vital. On the long run, the successful pairing of student groups with supervisor groups having specific features could be carried out for the sake of successful student accomplishment and for standardizing the supervision process as well.