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We address the facility location problem for firms that sell an homogeneous product and compete on delivered prices. If the firms set equilibrium prices at each market, the problem can be seen as a location game for which there exists a Nash equilibrium if demand is inelastic. However, this equilibrium may be Pareto-inefficient and the firms could decide to collude if they can guarantee themselves higher payoffs than those prescribed by the equilibrium. The aim of this paper is to study the joint profit maximization problem to obtain a collusive solution of the location game (Pareto-efficient) and determine if such a solution is also a Nash equilibrium. We develop Integer Linear Programming models to find Pareto-efficient solutions for multiple and single facility location. Nash equilibria are obtained by the best response procedure. An empirical investigation is performed to compare the joint profit of the firms and the profit of each one of the firms, got through the Pareto-efficient locations, with those got through the Nash equilibrium. [ABSTRACT FROM AUTHOR]

New data on the Staphylinidae (Coleoptera) community related to animal corpses in southeastern Iberian Peninsula are given. A study was conducted at Sierra Espuña foothills using a modified Schoenly type trap, with pitfall traps inside and baited with a piglet, following the methodology applied previously. Samples were taken during 8 consecutive weeks in each season of the year. Specimens belonging to 18 different species were collected. Of them, 6 species (≈33%) are new records for the Región de Murcia, widening their currently known distribution. Besides, four species are reported from the cadaveric ecosystem for the first time. The most representative species was Creophilus maxillosus, which dominated the community all along the seasons. [ABSTRACT FROM AUTHOR]

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