Attribution analysis uses the Fund Managers and Benchmarks asset allocations and returns across asset classes. A potential investor wishes to understand the skills of a Fund Manager based on the data below:

Asset Class	Fund Weight	BM Weight	FM Return	BM Return
Equity	20%	50%	6%	8%
Bonds	80%	50%	6%	4%

Explain why is it important for the investor to decompose Active returns rather than simply use Active returns to compare performance?