This paper studies the decentralized choice of universities facing the decision to launch a new program at the graduate level (a master or a doctoral program) when students' enrollment decisions are a ected by network e ects. Possible ine ciencies associated to the existence of network externalities on student utility are .rst identi.ed. University competition eliminates some ine ciencies, although not all of them. Under these circumstances, a hallmark certifying the high quality of a program (known in Spain as Mención de Calidad) may prove useful to select the most e cient equilibrium.
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