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  • 1. Bednay, Dezső
    et al.
    Tasnádi, Attila
    Yadav, Sonal
    Umeå University, Faculty of Social Sciences, Umeå School of Business and Economics (USBE), Economics.
    On the manipulability of a class of social choice functions: plurality kth rules2022In: Review of Economic Design, ISSN 1434-4742, E-ISSN 1434-4750, Vol. 26, p. 127-148Article in journal (Refereed)
    Abstract [en]

    In this paper we introduce the plurality kth social choice function selecting an alternative, which is ranked kth in the social ranking following the number of top positions of alternatives in the individual ranking of voters. As special case the plurality 1st is the same as the well-known plurality rule. Concerning individual manipulability, we show that the larger k the more preference profiles are individually manipulable. We also provide maximal non-manipulable domains for the plurality kth rules. These results imply analogous statements on the single non-transferable vote rule. We propose a decomposition of social choice functions based on plurality kth rules, which we apply for determining non-manipulable subdomains for arbitrary social choice functions. We further show that with the exception of the plurality rule all other plurality kth rules are group manipulable, i.e. coordinated misrepresentation of individual rankings are beneficial for each group member, with an appropriately selected tie-breaking rule on the set of all profiles.

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  • 2. Kumar, Ujjwal
    et al.
    Roy, Souvik
    Sen, Arunava
    Yadav, Sonal
    Umeå University, Faculty of Social Sciences, Umeå School of Business and Economics (USBE).
    Zeng, Huaxia
    Local global equivalence for unanimous social choice functions2021In: Games and Economic Behavior, ISSN 0899-8256, E-ISSN 1090-2473, Vol. 130, p. 299-308Article in journal (Refereed)
    Abstract [en]

    We identify a condition on preference domains that ensures that every locally strategy-proof and unanimous random social choice function is also strategy-proof. Furthermore every unanimous, locally strategy-proof deterministic social choice function is also group strategy-proof. The condition identified is significantly weaker than the characterization condition for local-global equivalence without unanimity in Kumar et al. (2020). The condition is not necessary for equivalence with unanimous random/deterministic social choice functions. However, we show the weaker condition of connectedness remains necessary.

  • 3.
    Kumar, Ujjwal
    et al.
    Economic Research Unit, Indian Statistical Institute, Kolkata, India.
    Roy, Souvik
    Economic Research Unit, Indian Statistical Institute, Kolkata, India.
    Sen, Arunava
    Economics and Planning Unit, Indian Statistical Institute, New Delhi, India.
    Yadav, Sonal
    Umeå University, Faculty of Social Sciences, Umeå School of Business and Economics (USBE), Economics.
    Zeng, Huaxia
    School of Economics, Shanghai University of Finance and Economics, China; Key Laboratory of Mathematical Economics (SUFE), Ministry of Education, United States.
    Local-global equivalence in voting models: A characterization and applications2021In: Theoretical Economics, ISSN 1933-6837, E-ISSN 1555-7561, Vol. 16, no 4, p. 1195-1220Article in journal (Refereed)
    Abstract [en]

    The paper considers a voting model where each voter's type is her preference. The type graph for a voter is a graph whose vertices are the possible types of the voter. Two vertices are connected by an edge in the graph if the associated types are “neighbors.” A social choice function is locally strategy-proof if no type of a voter can gain by misrepresentation to a type that is a neighbor of her true type. A social choice function is strategy-proof if no type of a voter can gain by misrepresentation to an arbitrary type. Local-global equivalence (LGE) is satisfied if local strategy-proofness implies strategy-proofness. The paper identifies a condition on the graph that characterizes LGE. Our notion of “localness” is perfectly general. We use this feature of our model to identify notions of localness according to which various models of multidimensional voting satisfy LGE. Finally, we show that LGE for deterministic social choice functions does not imply LGE for random social choice functions.

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  • 4. Nicolo, Antonio
    et al.
    Sen, Arunava
    Yadav, Sonal
    Umeå University, Faculty of Social Sciences, Umeå School of Business and Economics (USBE).
    Matching with partners and projects2019In: Journal of Economic Theory, ISSN 0022-0531, E-ISSN 1095-7235, Vol. 184, article id 104942Article in journal (Refereed)
    Abstract [en]

    We propose a model where agents are matched in pairs in order to undertake a project. Agents have preferences over both the partner and the project they are assigned to. These preferences over partners and projects are separable and dichotomous. Each agent partitions the set of partners into friends and outsiders, and the set of projects into good and bad ones. Friendship is mutual and transitive. In addition, preferences over projects among friends are correlated (homophily). We define a suitable notion of the weak core and propose an algorithm, the minimum demand priority algorithm (MDPA) that generates an assignment in the weak core. In general, the strong core does not exist but the MDPA assignment satisfies a limited version of the strong core property when only friends can be members of the blocking coalition. The MDPA is also strategy-proof. Finally we show that our assumptions on preferences are indispensable. We show that the weak core may fail to exist if any of the assumptions of homophily, separability and dichotomous preferences are relaxed. 

  • 5.
    Nicolò, Antonio
    et al.
    Department of Economics, University of Padova, via del Santo 33, Padova, Italy; School of Social Sciences, The University of Manchester, Manchester, United Kingdom.
    Salmaso, Pietro
    Department of Economics, University of Padova, via del Santo 33, Padova, Italy.
    Sen, Arunava
    Economics and Planning Unit, Indian Statistical Institute, 7 S.J.S Sansanwal Marg, New Delhi, India.
    Yadav, Sonal
    Umeå University, Faculty of Social Sciences, Umeå School of Business and Economics (USBE).
    Stable sharing2023In: Games and Economic Behavior, ISSN 0899-8256, E-ISSN 1090-2473, Vol. 141, p. 337-363Article in journal (Refereed)
    Abstract [en]

    We propose a simple model in which agents are matched in pairs in order to complete a task of unit size. The preferences of agents are single-peaked and continuous on the amount of time they devote to it. Our model combines features of two models: assignment games (Shapley and Shubik (1971)) and the division problem (Sprumont (1991)). We provide an algorithm (Select-Allocate-Match) that generates a stable and Pareto efficient allocation. We show that stable allocations may fail to exist if either the single-peakedness or the continuity assumption fail.

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