In an index fund portfolio, the index applies two to three rules to a pre-defined universe for stock selection and weight allocation. In an active portfolio, the basis of fund manager’s decisions is the ground-up criteria. It may be different for different stocks. Just like an investor would want to diversify amongst two funds —basically judgement of two fund managers, it could be a good idea to diversify amongst active investing and passive investing approaches.
Financial calculators offer oversimplified projection and can come apart easily; why you must not take these as final word
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