“…Similarly, the risk-weighted index method has a disadvantage in that in some cases it could be concentrated in too few stocks or may require a covariance between stocks to be calculated; due to the higher dimensionality of this covariance matrix it is hard to use this method (Amenc, Goltz, Martellini, & Retkowsky, 2010;Chia, Melas, & Zhou, 2011;Choueifaty & Coignard, 2008;Chow, Hsu, Kalesnik, & Little, 2011;Clarke, de Silva, & Thorley, 2006;Haugen & Baker, 1991). As emerging equity markets have high volatility, it would seem plausible that risk-weighted indexes would be a suitable index option.…”