This is just a technicality however. In practice you have to buy stocks according to the index yourself or invest into a fund that mirrors the index for you. The secret sauce in ETFs is that algorithms do the work of the fund manager and thus reduce costs.
https://en.wikipedia.org/wiki/S%26P_500#History
This is just a technicality however. In practice you have to buy stocks according to the index yourself or invest into a fund that mirrors the index for you. The secret sauce in ETFs is that algorithms do the work of the fund manager and thus reduce costs.