Comment by bluGill
4 hours ago
> Correction: index funds don't have a choice. They must follow the index, and so must buy the stock.
Maybe, most indexes do not have to follow the index. they just need to match the returns. An index fund manager has choice of what stocks to buy. However an index fund doesn't have enough managers to make many choices and so they normally buy just what is in the index. However all index fund managers know they are large enough that if they change their holdings "instantly" when the index it self changes the market will collapse and so the fund will under perform. Thus index fund managers are always trying to figure out what the index will do so they can start buying/selling stocks in smaller amounts before the change happens.
How each fund handles this is up to the managers. (and "total market" funds have less ability and need to do this)
The whole point of index funds is that you don't have to pay management fees to managers. It's very expensive to hire a team of people to analyze the entire stock market in detail and chose the best 500 companies, and historically people who did that on average didn't beat the S&P500.
Just look up the performance of Mutual Funds vs S&P500.
That is the point, and index funds pay many less managers. However they all have a few managers to handle the various paperwork needed and those managers do make some decisions. They have much less influence vs a traditional funds, but it is slightly above zero.
I think the point is that they don't have the influence to intentionally deviate from the index because they think they know better. If your mandate is to be passive, then you need an index to follow. If you are that sure the S&P 500 index is wrong for some reason, or whatever other index you follow, then you need to invent a new index. Then, you can follow the new index.
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So are they incentivized to allow an obvious grift and let the index have middling returns so they can skim the difference?
but any upside to second guessing the index gets allocated to the management, right? just like any downside, so its kind of immaterial for the end users, they're effectively bought into to SpaceX anyways
They are judged by how close to the index their returns are. If there a significant deviation either way they are judged harshly. Each fund is different, but they typical thing they will do is buy a competitor of some company in the index once in a while.
Typically managers pay is such that they don't get awards for guessing correctly, so they won't get any upside from a correct second guess, and they will see downsides from incorrect guesses.
Also unlike traditional funds, there are not enough managers to follow every company, so they can't pick stocks that will win just because they don't have enough to time research the stock. When they pick a stock they are just looking at the high level will this company perform like the other peers in the industry long term.