Offer your thoughts or opinion on the input financial query or topic using your financial background.

Why not just invest in the market?
Perhaps someone has an investment objective different than following the market. If one is investing in stocks with an intent on getting dividend income then there may be other options that make more sense than owning the whole market. Secondly, there is Slice and Dice where one may try to find a more optimal investment idea by using a combination of indices and so one may choose to invest 25% into each of large-cap value, large-cap growth, small-cap value and small-cap growth with an intent to pick up benefits that have been seen since 1927 looking at Fama and French's work.