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The cost of fair divisions: An experimental investigation of Ultimatum Games with groups

  • Marco Faillo


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    I investigated the effect of the presence of a group of non-active subjects upon the behavior of active players in a Ultimatum bargaining game. In the experiment a subject with the role of P has to offer a share r of a sum S to a subject with the role of AR who belongs to a group and decides on behalf of his group’s members (players R). If AR rejects the P’s offer, both active and non-active players get zero, if AR accepts the offer then P gets S - r while r is equally divided between AR and the members of his group. Every subject assumes all the three roles (P, AR and R) and the group size is manipulated keeping constant the share S/N (with N=number of subjects, either active or non active, involved in the game) Data suggest that active players tend to behave as they were playing a standard two-person Ultima- tum game. A clear insensitivity to changes in group size by subjects playing as P, emerging in the main experiment, is compatible with the hyphotesis that at the basis of their behavior there is a willingness to gain a payoff which satisfies an ex-ante fixed aspiration level, that for most of them corresponds to about half of S. The interpretation of the decisions taken by subjects under the AR role is more complicated as, although most of them show a behavior which is compatible with the one observed in the standard Ultimatum Game, a non-negligible share of players fix very low acceptance thresholds that could be explainained in terms of a shift from the willingness to punish unfair behaviors to the responsibility for others’ wellbeing.

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    Paper provided by Cognitive and Experimental Economics Laboratory, Department of Economics, University of Trento, Italia in its series CEEL Working Papers with number 0402.

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    Date of creation: 2004
    Date of revision:
    Handle: RePEc:trn:utwpce:0402
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    1. Robin Cubitt & Chris Starmer & Robert Sugden, 1998. "On the Validity of the Random Lottery Incentive System," Experimental Economics, Springer, vol. 1(2), pages 115-131, September.
    2. Gary Bornstein & Ilan Yaniv, 1998. "Individual and Group Behavior in the Ultimatum Game: Are Groups More “Rational†Players?," Experimental Economics, Springer, vol. 1(1), pages 101-108, June.
    3. Falk, Armin & Fischbacher, Urs, 2001. "A Theory of Reciprocity," CEPR Discussion Papers 3014, C.E.P.R. Discussion Papers.
    4. Ernst Fehr & Klaus M. Schmidt, . "A Theory of Fairness, Competition and Cooperation," IEW - Working Papers 004, Institute for Empirical Research in Economics - University of Zurich.
    5. Starmer, Chris & Sugden, Robert, 1991. "Does the Random-Lottery Incentive System Elicit True Preferences? An Experimental Investigation," American Economic Review, American Economic Association, vol. 81(4), pages 971-78, September.
    6. Fershtman, C & Gneezy, U, 1996. "Strategic Delegation : An Experiment," Papers 43-96, Tel Aviv.
    7. Gary E Bolton & Axel Ockenfels, 1997. "A Theory of Equity, Reciprocity, and Competition," Levine's Working Paper Archive 1889, David K. Levine.
    8. Selten, Reinhard & Ockenfels, Axel, 1998. "An experimental solidarity game," Journal of Economic Behavior & Organization, Elsevier, vol. 34(4), pages 517-539, March.
    9. Guth, Werner & Schmittberger, Rolf & Schwarze, Bernd, 1982. "An experimental analysis of ultimatum bargaining," Journal of Economic Behavior & Organization, Elsevier, vol. 3(4), pages 367-388, December.
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