es 2002 Bouchaud & Mezard 2000 Bouchaud et al 2009 Bray et al 2005 Berg 2010 Brealey et al 2008 Britton 2003 Burgstaller 1994 Campbell 2003 Abul-Magd AY, 2002. Wealth distribution in an ancient Egyptian society. Phys. Rev. E 66, 057104. Acharya V, Pedersen L, 2005. Asset pricing with liquidity risk.