tokens: J-M M acknowledges financial support from the Spanish Ministerio de Economía y Competitividad (grants AYA2013-40979-P, and AYA2013-48226-C3-2-P) and from the local Autonomous Government (Generalitat Valenciana, grant Prometeo-II/2014/069). The author also acknowledges fruitful discussions with Professors J. A. Miralles and M. Perucho, and the anonymous referee for comments and criticism that helped to improve this manuscript.
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