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Wouldn't they say that cash is outside the investable universe they're talking about? I'd imagine they'd argue that it's impossible to judge which stocks are going to go down so successful use of cash is a random fluctuation. And of course, they've shown they're not above tossing in phantom 'risk' factors to explain any discrepancies.Nevertheless, I'll provide you with more ammunition!
By my estimate, there are 6,281 stocks on the NASDAQ plus NYSE, so you are being too nice.....your argument is stronger than you stated it to be! So my guess is that there are 2,597 stocks unaccounted for in the total market index, not just 1400 !
Thx, the number keeps changing depending on when it was counted in the economic cycle. It has been as high as 9000+ in the recent past. 5000 was used as a lower bound.
What's up with that? How can ALL active investors sell? Who are they going to sell to?
The passive investors, or indexers, are just buying and holding the index. To keep with the theme of the discussion, I don't see how it is possible for ALL the active investors to sell and go to cash. They can't sell unless there are other active investors to buy their stocks.
Sell to all the index funds and ETFs that must keep buying mindlessly with net inflow of money into each fund, of course. :-)
Index fund and buy and hold are independent concepts. Index funds may not churn stocks (and so passive that way) but they are buying and selling all the time based on net flows of money in and out of the fund. Active traders use index etfs to trade.
Selling everything is a logical extreme in theory. The point is that the more the active funds sell losing stocks to go to cash, the greater the divergence from the index performance mathematically and Sharpe's guarantee.
In practice, active investors can be thankful for the liquidity provided by index funds for stocks in the index when there is net inflow of money into index funds. Helps their rotation or profit taking strategy.
For example, transports are currently extremely relatively overbought and funds trading technically will be dumping them over the next few weeks/months if other sectors don't catch up. A lot of it will be purchased by index funds unless there is a net outflow of money from index funds in which case they will sell as well and we get a big correction.I think cman hit on the critical point, that for this stuff to be mathematically true, you have to be talking about exactly the same investing universe of stocks. So "the index" or "the indices" have to be very clearly defined. And if the active managers invest in stocks that are not in the indexes, then the math assumptions, including what William Sharpe wrote and what Bogle talks about, do not hold.
It is worse as pointed above. It is not ANY index fund that can be used for the mathematical guarantee. Only the theoretical index that is a close enough representation of the proportional holdings across all investors at all times of all stocks held by them. You cannot run a real fund in practice with that property.
As to how closely the typical market cap weighted index funds tracks that theoretical index in practice, I don't have concrete data. But I would expect it to vary significantly and diverge more as the market cap range increases in the category being indexed.
Thx, the number keeps changing depending on when it was counted in the economic cycle. It has been as high as 9000+ in the recent past. 5000 was used as a lower bound.Nevertheless, I'll provide you with more ammunition!
By my estimate, there are 6,281 stocks on the NASDAQ plus NYSE, so you are being too nice.....your argument is stronger than you stated it to be! So my guess is that there are 2,597 stocks unaccounted for in the total market index, not just 1400 !
Sell to all the index funds and ETFs that must keep buying mindlessly with net inflow of money into each fund, of course. :-)
What's up with that? How can ALL active investors sell? Who are they going to sell to?
The passive investors, or indexers, are just buying and holding the index. To keep with the theme of the discussion, I don't see how it is possible for ALL the active investors to sell and go to cash. They can't sell unless there are other active investors to buy their stocks.
It is worse as pointed above. It is not ANY index fund that can be used for the mathematical guarantee. Only the theoretical index that is a close enough representation of the proportional holdings across all investors at all times of all stocks held by them. You cannot run a real fund in practice with that property.I think cman hit on the critical point, that for this stuff to be mathematically true, you have to be talking about exactly the same investing universe of stocks. So "the index" or "the indices" have to be very clearly defined. And if the active managers invest in stocks that are not in the indexes, then the math assumptions, including what William Sharpe wrote and what Bogle talks about, do not hold.
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