I study large random assignment economies with a continuum of agents and a …nite number of object types. I consider the existence of weak priorities discriminating among agents with respect to their rights concerning the …nal assignment. The respect for priorities ex ante (ex-ante stability) usually precludes ex-ante envy-freeness. Therefore I de…ne a new concept of fairness, called no unjusti…...

In recent years increasing stress lias been laid by speakers and writers 011 the importance of ante-natal care in the preventive aspect of obstetrics, and it has come to be believed that by such means the great majority of obstetric emergencies can be avoided. That this is not fact has been the cause of many discussions on such subjects as " Why are we dissatisfied with the results of ante-nata...

Diagnostic information allows an agent to predict the state of nature about the success of an investment project better than the prior. We analyze the optimal pricing scheme for selling diagnostic information to buyers with different, privately known, ex ante success probability. Investment costs and returns of successful projects are assumed to be the same for all buyers. The value of diagnost...

The purpose of the Integrated Natural Resources Management program in the Middle East and North Africa Region (MENARID) is to bring national investment projects in the field of Integrated Natural Resource Management (INRM). The impact evaluation study tests whether the selected technology has significantly contributed to restore and maintain of the ecosystem functions and productivity, and whet...

In a school choice mechanism, school priorities are often based on student exam scores, by which student true ability may not be perfectly revealed. An ex-post fair matching mechanism (for example, Serial Dictatorship) can be undesirable in that it is not ex-ante fair: it may not match students with higher abilities to better schools, although it always matches students with higher scores to be...