Résumé On étudie par des méthodes de type calcul stochastique les propriétés de martingales d'une classe très générale de processus de branchement à valeurs mesures. Leurs caractéristiques locales et temps d'explosion sont explicités en fonction de la forme de leur cumulant. Enfin,...

We present a general model for default times, making precise the role of the intensity process, and showing that this process allows for a knowledge of the conditional distribution of the default only "before the default". This lack of information is crucial while working in a multi-default...

Many investors do not know with certainty when their portfolio will be liquidated. Should their portfolio selection be influenced by the uncertainty of exit time? In order to answer this question, we consider a suitable extension of the familiar optimal investment problem of Merton [Merton,...