Daly, Kevin; Vo, Vinh - In: Physica A: Statistical Mechanics and its Applications 387 (2008) 16, pp. 4261-4271
Recent evidence by Campbell et al. [J.Y. Campbell, M. Lettau B.G. Malkiel, Y. Xu, Have individual stocks become more volatile? An empirical exploration of idiosyncratic risk, The Journal of Finance (February) (2001)] shows an increase in firm-level volatility and a decline of the correlation...