[Lazare]

Hilariously, the company going bankrupt can be even worse for shorts, since a bankrupt company will stop trading, and if it stops trading, the short position can't be closed.

See, eg, https://www.bloomberg.com/opinion/articles/2018-04-11/-go-to...

> Seems like a potential strategy hedge funds can use (and maybe are using)

Anyhow, no, doesn't work. Even apart from getting burnt when the fraud is finally exposed and the company goes bust before your short position is closed or whatever (which is thankfully pretty unusual), stock borrow costs will eat you alive. Also, you can't short more than the float (short interest can be over 100%, but that's confusing net versus gross), you can't collect more cash than the market cap of the company, and you can't really bankrupt healthy companies by shorting the stock.

(The way short sellers (like Muddy Waters work is they find a company doing a bunch of fraud, they take out a large short position, then they publicise their research. If the market agrees with them, the uncovered fraud tanks the stock price, and they make a healthy profit. Sometimes the company ends up bankrupt and/or with their executives in prison, but the cause is the fraud, not the short selling. Short selling an otherwise healthy company into bankruptcy doesn't make a lot of sense in theory, and doesn't seem to happen in practice.)

[pluto9]

> they take out a large short position, then they publicise their research. If the market agrees with them, the uncovered fraud tanks the stock price, and they make a healthy profit.

This is giving the market a lot of credit for being a rational and well-informed actor. The market is not full of people who calmly evaluate a short seller's argument and make a logical decision. It's full of people who lack the time, experience, and confidence to question the "financial expert" making dire predictions on the morning news and think "I should get out of this stock just to be safe".

[Lazare]

Oh, I agree completely. Individual market participants make tons of mistakes, and absolutely won't be able to evaluate short (or long!) arguments correctly in many cases. That's actually one of the key elements supporting the efficient market hypothesis, and why so much ink is spent encouraging small investors to use index funds.

But it's a question of scale. The fact that any one investor may make mistakes doesn't mean that the market as a whole, in the medium or long term, also makes these sorts of mistakes.

"Some hedge fund guy released a report saying stock X is bad and the stock tanked 30% from small investors panicking before recovering when people realised it actually wasn't bad" is pretty silly, yes. And it's a bit rough on the small investors selling at a loss into the large investors who are able to correctly analyse the report, absolutely. But does any company actually go bankrupt in cases like this? The answer seems to be no; there's no evidence for it happening, and it's hard to see how it even could. Confused retail investors can lead to price volatility, but they don't make or break a new share offering.

[yellowstuff]

Normally that's not really the case. There's a lot of academic and practical evidence that the most rational investors generally determine the prices of stocks, because even if there are a lot of irrational investors making random or systematic errors, a minority of rational investors all betting in the same direction ensure that prices are close to "correct", for some reasonable definition of correct.

In practice you just don't see examples of productive companies driven into insolvency by short sellers.