Linear programming solutions and distance functions under α-returns to scale / J.-P. Boussemart in Journal of the operational research society (JORS), Vol. 61 N° 8 (Août 2010)  

Public ISBD [article]  inJournal of the operational research society (JORS) > Vol. 61 N° 8 (Août 2010) . - pp. 1297–1301 Titre : Linear programming solutions and distance functions under α-returns to scale Type de document : texte imprimé Auteurs : J.-P. Boussemart, Auteur ; W. Briec, Auteur ; H. Leleu, Auteur Année de publication : 2011 Article en page(s) : pp. 1297–1301 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Data envelopment analysis Methodology Production Index. décimale : 001.424 Résumé : This note generalizes analytical relationships among activity variables of Data envelopment analysis models previously derived in a previous article by the authors of this note. We relax the assumption of constant returns to scale by showing that the key results hold under a weaker assumption of homogeneity. We use the notion of α-returns to scale to extend the analysis to strictly increasing and decreasing returns, covering now the whole range of returns to scale for multi-output homogenous technologies. DEWEY : 001.424 ISSN : 0361-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v61/n8/abs/jors200997a.html [article] Linear programming solutions and distance functions under α-returns to scale [texte imprimé] / J.-P. Boussemart, Auteur ; W. Briec, Auteur ; H. Leleu, Auteur . - 2011 . - pp. 1297–1301. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 61 N° 8 (Août 2010) . - pp. 1297–1301 Mots-clés : Data envelopment analysis Methodology Production Index. décimale : 001.424 Résumé : This note generalizes analytical relationships among activity variables of Data envelopment analysis models previously derived in a previous article by the authors of this note. We relax the assumption of constant returns to scale by showing that the key results hold under a weaker assumption of homogeneity. We use the notion of α-returns to scale to extend the analysis to strictly increasing and decreasing returns, covering now the whole range of returns to scale for multi-output homogenous technologies. DEWEY : 001.424 ISSN : 0361-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v61/n8/abs/jors200997a.html

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Measuring potential gains from specialization under non-convex technologies / S. Blancard in Journal of the operational research society (JORS), Vol. 62 N° 10 (Octobre 2011)  

Public ISBD [article]  inJournal of the operational research society (JORS) > Vol. 62 N° 10 (Octobre 2011) . - pp. 1871–1880 Titre : Measuring potential gains from specialization under non-convex technologies Type de document : texte imprimé Auteurs : S. Blancard, Auteur ; J.-P. Boussemart, Auteur ; H. Leleu, Auteur Année de publication : 2011 Article en page(s) : pp. 1871–1880 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Specialization Free coordination hull disposal Agriculture Index. décimale : 001.424 Résumé : In this paper, the Free Coordination Hull (FCH) approach developed by Green and Cook (2004) is combined with the Free Disposal Hull (FDH) model to detect potential gains from specialization. As a non-convex approach that allows both directly observed and summed Decision Making Units to define the production technology, FCH is the relevant model for analysing optimal reallocation of activity among smaller and more specialized units. Indeed in more traditional Data Envelopment Analysis models the convexity assumption precludes the possibility of detecting potential gains from specialization and can only reveal economies of scope. Therefore non-convex technologies are required to model diseconomies of scope. On the basis of FDH and FCH technologies, an overall efficiency measure is decomposed into three components, namely: technical, size and specialization efficiencies. A 2003 database of French farms is used as an illustration. Results indicate that input inefficiency in the agricultural sector is mainly driven by a lack of specialization, which represents approximately 50% of the overall inefficiency. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n10/abs/jors2010148a.html [article] Measuring potential gains from specialization under non-convex technologies [texte imprimé] / S. Blancard, Auteur ; J.-P. Boussemart, Auteur ; H. Leleu, Auteur . - 2011 . - pp. 1871–1880. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 62 N° 10 (Octobre 2011) . - pp. 1871–1880 Mots-clés : Specialization Free coordination hull disposal Agriculture Index. décimale : 001.424 Résumé : In this paper, the Free Coordination Hull (FCH) approach developed by Green and Cook (2004) is combined with the Free Disposal Hull (FDH) model to detect potential gains from specialization. As a non-convex approach that allows both directly observed and summed Decision Making Units to define the production technology, FCH is the relevant model for analysing optimal reallocation of activity among smaller and more specialized units. Indeed in more traditional Data Envelopment Analysis models the convexity assumption precludes the possibility of detecting potential gains from specialization and can only reveal economies of scope. Therefore non-convex technologies are required to model diseconomies of scope. On the basis of FDH and FCH technologies, an overall efficiency measure is decomposed into three components, namely: technical, size and specialization efficiencies. A 2003 database of French farms is used as an illustration. Results indicate that input inefficiency in the agricultural sector is mainly driven by a lack of specialization, which represents approximately 50% of the overall inefficiency. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n10/abs/jors2010148a.html

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