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> If some stock falls 50% because of panic selling, without anything having to do with the underlying company, it will eventually return to the correct price. A

> If some stock falls 50% because of panic selling, without anything having to do with the underlying company, it will eventually return to the correct price. And much sooner than the decades long timeline that you're saving for. But that's not true, because suppose if 99.9% of investors are buying ETFs and only 0.1% are actively managing, there won't be enough funds to bring all these panic dislocated stocks back up for many, many years.

cbanek 7y ago
> But that's not true, because suppose if 99.9% of investors are buying ETFs and only 0.1% are actively managing, there won't be enough funds to bring all these panic dislocated stocks back up for many, many years. The price change of a stock doesn't always depend on how often a stock is bought. For example, when earnings hit, a stock can easily move 10%. That's not because there was a certain amount of people buying at every price between what it was and +10%. This can happen because earnings are better, and many people base price of an earnings multiple. When new knowledge is put into the system, there's a new price. If everyone who is trading a stock agrees on a price, that is the price. If people don't agree, it is generally the highest price someone is willing to sell it for (and find a buyer), or the lowest someone is willing to buy it for (and find a seller). If that disconnects a lot, you get a high bid/ask spread, and possibly no shares trade (lack of liquidity). It might only take a few shares or be a very short time to move a stock a lot.