北同学2026-01-14 21:30:16

C is correct because if we measure the correlation between active management return, A = (P ? B), and style return, S = (B ? M), we can identify whether the manager’s active selection decisions align with the style currently favored by the market. A good benchmark should not reflect these systematic biases, as indicated by the correlation between A and S not being statistically different from zero. 这一段能否解释一下