Describing ESG performance attribution at a portfolio level is difficult because:
- A.
- there is a lack of third-party data providers.
- B.
- there is a size bias in ESG ratings in favor of large companies.
- C.
- many third-party data providers describe ESG attributes as an uncorrelated, statistically independent factor.
这题c选项为什么不对?第三方数据不正确不是业绩归因难得原因吗?