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A fund of funds may serve as a better indicator of aggregate performance of hedge funds (i.e., a better benchmark) because they suffer from less survivorship bias. If a fund of funds includes a fund that dissolves, the fund of funds includes the effect of that failure in the return of the fund of funds; however, an index may simply drop the failed fund. A fund of funds can suffer from style drift. This can produce problems in that the investor may not know what he/she is getting. Over time, managers may tilt their respective portfolios in different directions. It is not uncommon that two fund of funds who claim to be of the same style to have returns with a very low correlation.