CROISSANCES OPTIMALES DANS UN MODELE MACROECONOMIOUE E. (MALINVAUD Institut National de la Statistique et des Etudes Economique: Paris - France ORAL PRESENTATION (* I may be brief on the motivations for this paper after what was sald by Professor Koopmans. Like him, I wanted to understand better the logical problems raised by choices be- tween intertemporal program and, in particular, to deal, as rigorously as I could, with the case when the utility is defined over an indefinite future. Moreover, I wanted to explore the relations between various particular models, proposed by RAM- SEY, TINBERGEN, RADNER and SRINIVASAN, all dealing with the choice of optimal programs. but starting from different hypo- theses. In this oral presentation, I shall briefly survey the various sections of mv paper. After a short introduction in section 1, section 2 defines the model. Like Professor Koopmans. I am dealing with a world *) Le texte de la présentation orale est reproduit à titre de résumé en langue anglaise du mémoire nresenté a nartir de la page aq. 5 Malinvaud - pag.