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.)
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".
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.
In practice you just don't see examples of productive companies driven into insolvency by short sellers.
There's no such reality check with things going up on the long side as we see from Gamestop. Someone can't step in and cash out on the company at a ridiculously high price compared to fundamentals. It is only driven by the market. In general short sellers are vilified more than warranted. If you are long on a good company you should applaud them because after all, they now have to buy back at some point. People view it as if you are some villain going against what is right (shares just going up and everyone gets rich). Stocks that go down with high short interest are almost always going down because they are bad companies, not due to short sales.
Not if the company goes bankrupt though, right?
Seems like a potential strategy hedge funds can use (and maybe are using) is to short a company a ton and collect a lot of money from that. They can short more than the float, so even collecting more cash then the market cap of the company. This drives the price down, because there is more supply. The more they short, the more the price goes down. Then they just wait for the company to go bankrupt, which is more likely since the company's share price is in the dumpster.