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Re:The Impact of Index Investing: A Follow-Up by joncrocks on Wednesday May 04, 2016 @12:34PM (#11629528)
Isn't there a danger that if not enough people actively manage their money, the market won't 'correctly' set prices?

If you own all of the stock in the US, and no-one actively trades in any single stock, how do you know how much one sort of stock is worth against another piece of stock?

I think this eventually drives trading of individual stocks, as the market looks to set prices/trade things this that it thinks are over/under valued.

So I think that it's true that on average an active investor will make less money than a passive one, it's the active one's doing the work/generating the value, as well as giving money to the passive investors!

(presuming rational actors, laws are obeyed etc etc)

Re:The Impact of Index Investing: A Follow-Up by jcdavis on Wednesday May 04, 2016 @01:06PM (#11629760)
> Isn't there a danger that if not enough people actively manage their money, the market won't 'correctly' set prices?

If this stuff interests you, I recommend reading the previous post (http://www.philosophicaleconomics.com/2016/05/passive/), which discusses this exact topic.

Re:The Impact of Index Investing: A Follow-Up by pbreit on Wednesday May 04, 2016 @02:25PM (#11630481)
I think you're right that there would be a natural balancing. If too many passive dollars went into certain companies, they should become more clearly over-valued than a peer not in the index.
Re:The Impact of Index Investing: A Follow-Up by drumdance on Wednesday May 04, 2016 @11:01PM (#11633733)
When people withdraw money from an index fund -- say, to put a downpayment on a house or move it into a fixed income fund for retirement -- they are effectively placing a sell order on every stock in the index.

And if they put money in from their monthly paycheck, they're placing a buy order.

As long there is a reasonably good balance of buyers and sellers of mutual funds, the underlying securities will find equilibrium.

Re:The Impact of Index Investing: A Follow-Up by dragonwriter on Wednesday May 04, 2016 @01:30PM (#11629975)
> Isn't there a danger that if not enough people actively manage their money, the market won't 'correctly' set prices?

There is no "correct" price aside from the price set through the market.