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Is there any benefit to investing in an index fund?
Index funds are good for diversifying risk. For people who don't have a large sum of money to invest, holding all the different types of stocks in the index is both very expensive and not practical because you incur too many transaction costs. For an index funds, the main advantages are that costs are pooled, and investors can invest a smaller amount that they would if they bought all the different stocks individually. Naturally, if you wanted to figure out the percentage composition of the index and invest directly it would be possible, albeit tedious.