Earlier quoted context omitted.
If the market always knows best then why do I need traders except for market making purposes? Shouldn't everyone just buy the lowest cost passive ETF of a big enough index like S&P 500 then? I think "the market always knows best" is correct in most cases and if you think you know better you are probably wrong but there are empirical counterexamples like the Buffets of the world (unless one would claim that his gains…
> Shouldn't everyone just buy the lowest cost passive ETF of a big enough index like S&P 500 then? Yes, this is very best the advise to invest your money (except if your name is Warren Buffet). Buy it and hold it. There have been so many papers published that show this. You cannot predict the market, what you can do is save yourself some risk and some transaction costs. Any investment advisor that tells you different…
The problem is the above is similar to a zero sum game in that there is a fixed total profit to be made in that way, and that money is shared between everyone who is correct (including index funds!). Since there are a lot of people trying to make the above trades the total profit you can make is reduced as they have already moved the price above what a pure index fund market would have it at. (a true zero sum game every winner is paired with a loser, while the above doesn't actually have losers in the same way, but I don't know any other way to explain it)
I concluded long ago that if I made studying the market my full time job and hobby I could make a good income doing it. However reading all the reports is boring, while writing code is fun, so I just invest in index funds.