We consider a team of agents with limited problem-solving ability facing a disjunctive task over a large solution space. We provide sufficient conditions for the following four statements. First, two heads are better than one: a team of two agents will solve the problem even if neither agent...

The first objective of this contribution is to evaluate the performance of SRI equity mutual funds in the main European countries with three different DEA models. Secondly, with a series of statistical tests we compare the performance of SRI and non SRI mutual funds in the various countries, to...

A fronte della crescita nellÕofferta di fondi socialmente responsabili che si è registrata nel mercato internazionale nellÕultimo decennio, diviene significativo riuscire a distinguere i diversi fondi etici sulla base dei criteri di responsabilità sociale adottati dai gestori. Per tale...

We study a general preferential attachment and Pólya's urn model. At each step a new vertex is introduced, which can be connected to at most one existing vertex. If it is disconnected, it becomes a pioneer vertex. Given that it is not disconnected, it joins an existing pioneer vertex with...

This contribution studies the role of the size of mutual funds in the evaluation of the fund performance with a data envelopment analysis (DEA) approach, with the aim of studying the issue from different angles and with different statistical tools and of testing the presence of economies or...

We consider the solution of bound constrained optimization problems, where we assume that the evaluation of the objective function is costly, its derivatives are unavailable and the use of exact derivativefree algorithms may imply a too large computational burden. There is plenty of real...