Marsili, Matteo; Raffaelli, Giacomo - In: Physica A: Statistical Mechanics and its Applications 370 (2006) 1, pp. 18-22
We discuss a simple model of correlated assets capturing the feedback effects induced by portfolio investment in the covariance dynamics. This model predicts an instability when the volume of investment exceeds a critical value. Close to the critical point the model exhibits dynamical...