Single period Markowitz portfolio selection, performance gauging and duality: a variation on Luenberger's shortage function

Markowitz portfolio theory (1952) has induced research into the efficiency of portfolio management. This paper studies existing nonparametric efficiency measurement approaches for single period portfolio selection from a theoretical perspective and generalises currently used efficiency measures into the full mean-variance space. Therefore, we introduce the efficiency improvement possibility function (a variation on the shortage function), study its axiomatic properties in the context of Markowitz efficient frontier, and establish a link to the indirect mean-variance utility function. This framework allows distinguishing between portfolio efficiency and allocative efficiency. Furthermore, it permits retrieving information about the revealed risk aversion of investors. The efficiency improvement possibility function thus provides a more general framework for gauging the efficiency of portfolio management using nonparametric frontier envelopment methods based on quadratic optimisation.

Euroregión y pragmatismo: El Fondo Común Euskadi-Aquitania

Creat el 1990, el Fons Comú Euskadi-Aquitània ha demostrat la seva eficiència en matèria de finançament de projectes ransfronterers. Entre els factors que expliquen aquests resultats cal destacar els vincles transfronterers locals previs sobre els quals s'erigeix ​​el Fons. La voluntat comuna de crear un eix regional central a la costa atlàntica i l'equilibri de les forces olítiques basques i aquitanes afavoreixen també la cooperació. No obstant això, el Fons s'enfronta actualment a un dilema important: d'una banda seguir impulsant els projectes locals que neixen esporàdicament, i per altra institucionalitzar a nivell regional aquestes col · laboracions per a formar xarxes duradores.