Abstract
The aim of this paper is to extend the Myerson value (Myerson in Math Oper Res 2:225–229, 1977) to situations in which players in a TU-game, in addition to having cooperation possibilities restricted by a graph, also have different bargaining abilities. Then, we will associate to each player in a communication situation a weight in the interval [0, 1] that measures his bargaining ability. A unitary weight corresponds to a fully cooperative player whereas a null weight corresponds to a player that is not willing to cooperate in any way. Intermediate values modulate the bargaining ability. We modify the original TU-game to a new game which is, in turn, a modification of the Myerson’s graph-restricted game. We will assume that the reduction in the will to cooperate implies that players can not obtain the total dividend of the connected coalitions which must be discounted by an appropriate factor. Then, we propose as a solution for these situations the Shapley value (Shapley, in: Kuhn, Tucker (eds) Annals of mathematics studies, Princeton University Press, Princeton, 1953) of the modified game. This solution extends the Myerson value (and also the Shapley value). Moreover it satisfies monotonicity in the weights. Different characterizations of this rule can be obtained. They are based on properties as bargaining component efficiency, fairness, balanced contributions and balanced bargaining ability contributions, and thus they are parallel to those more prominent existing in the literature for the Myerson value.
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Notes
Although Shapley (1953a) suggested the bargaining ability of each player as a possible interpretation of his weight, Owen (1968) showed the lack of weight monotonicity in the weighted Shapley values and provided another interpretation for weights that “can better be thought of as coefficients of slowness to reach a decision” (Owen 1968).
The framework of this paper, graph-restricted games with players having weights, is similar to the one in Haeringer (1999).
Aubin (1981) also defined cooperative fuzzy games in which each fuzzy coalition obtains a reward by means of a characteristic function which is assumed positively homogeneous.
In the definition of fuzzy communication structure in Jiménez-Losada et al. (2010) also the graphs were restricted to being cycle-free.
In fact, \({\bar{\mu }}\) satisfies the following generalized version of the balanced bargaining ability contributions property: given \((N,v,\varvec{\lambda },\gamma ) \in {\mathcal {C}}{\mathcal {S}}_{\Lambda }^{N}\), and \(i,j \in N\)
$$\begin{aligned} \bar{\mu _{i}}(N,v,\varvec{\lambda },\gamma ) - \bar{\mu _{i}}(N,v,\varvec{\lambda }^{-j,c},\gamma ) = \bar{\mu _{i}}(N,v,\varvec{\lambda },\gamma ) - \bar{\mu _{i}}(N,v,\varvec{\lambda }^{-i,c},\gamma ), \end{aligned}$$where for \(k=i,j\), \(\varvec{\lambda }^{-k,c} = (\lambda _1^{-k,c},\lambda _2^{-k,c},\ldots ,\lambda _n^{-k,c})\) is given by
$$\begin{aligned} \lambda _l^{-k,c}=\left\{ \begin{array}{ll} \lambda _{l}, &{} \quad \mathrm{if }\, l \not = k\\ c<\lambda _{k}, &{} \quad \mathrm{if }\, l = k,\end{array}\right. \end{aligned}$$for \(l=1,\ldots ,n.\)
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Acknowledgements
This research has been partially supported by the “Plan Nacional de I\(+\)D\(+\)i” of the Spanish Government under the project MTM2015-70550-P. D. Martín also wants to thank University Complutense of Madrid and Bank of Santander for his pre-doctoral contract. The authors wish to thank two anonymous referees and the editor for their useful suggestions and comments.
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Manuel, C., Martín, D. A value for communication situations with players having different bargaining abilities. Ann Oper Res 301, 161–182 (2021). https://doi.org/10.1007/s10479-020-03825-z
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DOI: https://doi.org/10.1007/s10479-020-03825-z