Consideramos los descuentos comerciales por compras basados en rappels. Si se plantea un descuento de tipo uniforme aparece una paradoja no deseada: el “truco del comprador”. Para eludirla se proponen dos variantes que respetan el principio básico de “a mayor pedido, mayor descuento”. La primera es la de los descuentos continuos. La segunda, la de los descuentos graduales.Peer ReviewedPostprint (published version
This is a post-peer-review, pre-copyedit version of an article published in "TOP". The final authenticated version is available online at: https://doi.org/10.1007/s11750-017-0464-1Multinomial values were previously introduced by one of the authors in reliability and extended later to all cooperative games. Here, we present for this subfamily of probabilistic values three new results, previously stated only for binomial semivalues in the literature. They concern the dimension of the subspace spanned by the multinomial values and two characterizations: one, individual, for each multinomial value; another, collective, for the whole subfamily they form. Finally, an application to simple games is providedPeer ReviewedPostprint (author's final draft
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