On the other hand, ESG screening premised on relative and peer-group datasets
provides better context for building and maintaining a balanced, diversified portfolio.
This approach potentially prevents wholesale exclusions of poorly-rated industries
like mining on absolute value-based data, which may represent not only a meaningful
driver of the economic cycle but also a significant weighting within main indexes. As
we have discussed before, exclusions of this nature contribute to lower diversification
and, consequently, higher active risk within a portfolio.
如果同时基于absolute basis与relativebasis 会有什么效果?问题?