The aim of this paper is to present a general EM algorithm to estimate Mixed Proportional Hazard models including more than one random effect, through partial likelihood. We assume only that the mixing distributions admit Laplace transforms. We show how to transform inference in a single...

This paper uses a survey of French firms active in R&D to identify the determinants of R&D outsourcing and of the ensuing trade-off between R&D subcontracting and R&D cooperation. Internal R&D expenditures increase both the probability of outsourcing and the number of R&D partners. Investment in...

Nous étudions l'émergence de fluctuations endogènes dans un modèle à générations imbriquées dans lequel les producteurs se livrent une concurrence à la Cournot avec libre entrée. L'économie est caractérisée par un taux de marge variable et des rendements croissants. Nous analysons...

In an environment where the optimal level of care is unknown, we ask under a state of the art defense which method is better able to induce parties to undertake optimal care. Assuming courts can see a noisy signal of research activities undertaken by a defendant and some of its competitors, we...

We develop a model of Cournot oligopolists with endogenous R§D spillovers where a specific type of co-opetition is introduced. The two principle factors of R§D spillovers, namely the absorptive capacity and the information-sharing parameter, are assumed to depend positively on the percentage...

Grandmont\'s ([14]) notion of behavioral heterogeneity is reformulated in a non parametric set-up such that the space of budget share functions admits a ``uniform\'\' probability distribution. If the population is distributed according to this measure, the aggregate budget share function is...

Cet article étudie les implications, en termes de stabilité économique, de la relation entre le degré d’indépendance de la Banque centrale et le degré de transparence (ou d’opacité) de la politique monétaire dans un modèle qui tient explicitement compte des marchés financiers et...

In this paper, we highlight how inter-firm collaboration networks are influenced by the knowledge composition of goods in an industry. For this purpose, we carry out an agent based simulation study in which firms integrate their competencies under different knowledge base regimes. In this way...

This paper analyzes empirically the channels through which university research affects industry innovation. We examine how the opening of new science, medicine and engineering departments in Italy during 1985-2000 affected regional innovation systems. We find that creation of a new univer- sity...

Keywords Création de connaissance, Vision entrepreneuriale, ISO 9000, Management de la connaissance, PME