in the early 90’s, donkeys were in danger of extinction as species. in italy, there were counted few heads of many breeds but, unfortunately, others had already been extinct. with the donkey in danger, there was a risk of disappearance of a part of ecosystem, a biodiversity particularly significant as it represents humans’ history. all countries around the mediterranean sea, countries of southe...

We show that the full version of the so-called ‘rural hospital theorem’ generalizes to many-to-many matching problems where agents on both sides of the problem have substitutable and weakly separable preferences. We also show that when agents’ preferences satisfy substitutability, the domain of weakly separable pref-

In this note, I extend the work of Echenique (forthcoming) to show that a model of many-to-many matching with contracts may be embedded into a model of many-tomany matching with wage bargaining whenever (1) all agents’ preferences are substitutable and (2) the matching with contracts model is unitary, in the sense that every contractual relationship between a given firm–worker pair is specified...

Objective: Malaria is an infectious disease commonplace in tropical countries. For many years, major antimalarial drugs consisted of natural products, but since 1930s these drugs have been largely replaced with a series of synthetic drugs. This article tries to briefly indicate that some plants which previously were used to treat malaria, as a result of deficiencies of synthetic drugs, have rev...

Agriculture has a key role to play in reducing poverty and hunger in many developing countries. About 75% of the world's poor live in rural areas and most are dependent on agriculture and related activities in the rural economy. For this reason the benefits for developing countries’ farmers have been shown to be substantial if OECD member countries reformed their agricultural policies. The issu...

We present an algorithm for automatically constructing a decompositional shape model from examples. Unlike current approaches to structural model acquisition, in which one-to-one correspondences among appearance-based features are used to construct an exemplar-based model, we search for many-tomany correspondences among qualitative shape features (multi-scale ridges and blobs) to construct a ge...