Why do innovations need delay to diffuse, or why do they fail? This paper provides a possbile explanation. Considering a population of potential adopters of a technology, we set up a model composed of interacting agents. Interaction is conceived as influence effects and the network of...

We consider data on jewellery sold in English public auctions between June 1993 and May 1994 at Credit Municipal de Paris. We present the underlying model of this market derived from a "hedonic price equation".

This paper on the class of models studiyng the interaction between an altruistic benefactor and a selfish recipient. Bequest is the only transfer from an altruistic parent to his selfish son and we assume that it is not a valid collateral for bank loans. This is equivalent to addding a...

Most confidence intervals, whether based on asymptotic theory or the bootstrap, are implicitly based on inverting a Wald test. Since Wald test statistics are not invariant under nonlinear reparametrizations of the restrictions they test, confidence intervals based on them are not invariant...

Dans un modele a deux periodes on peut considerer que l'aide a l'etranger peut-etre definie soit en terme d'un bien a consommer soit en terme de controle des naissances. La taille de la population en deuxieme periode est endogene. Nous examinons l'affectation optimale de cette ressource rare en...

Discounted-cash-flow (DCF) techniques form the basis of most corporate-investment decisions. Many practitioners, however, claim to be dissatisfied with traditional methods of appraisal. In this paper, we survey DCF and more recent methods of evaluating cyclical projects.

Cet article etudie les consequences d'un altruisme non reciproque et demontre que l'exploitation du samaritain par le beneficiaire depend du niveau d'altruisme et non du montant des transferts. Un modele caracterise les conditions dans lesquelles un dilemme du prisonnier se transforme en un...

Cet article fournit quelques resultats de previsions de pics de pollution d'ozone pour la station de mesure de Vitrolles, situee dans l'Aire Metropolitaine Marseillaise. Nous presentons d'abord la methode de regression par arbre et une idee de stabilisation par Agregatopm par Bootstrap. Ces...