In extremis, a falling/low price could limit the size of a potential new equity fundraising because the resulting dilution is too much for existing shareholders to take, but Tesla's price/valuation would appear to put it quite far from this being an issue.

But if you think of equity as having a value other than derived from the market, then 'expensive' might still have applicability here.

It's been a long time since I've used this though.

I suppose if everybody shorts at the same time the huge amount of stock being sold could drive the price momentarily down, but then again the opposite happens when the stock is re-bought. So in the end it should be effectively zero-sum? Or is it just that a huge amount of people started shorting the stock at the same time which made it a sort of self-fulfilling prophecy?

If there are few willing sellers out there when everybody goes to cover their short, you get a short squeeze - a feedback loop where the price increases, so people need to buy to cover shorts to avoid losses, which pushes the price up, which means more people need to buy to avoid further losses as the price rises and so on.

The original owner who lent the stock can also ask for it back on relatively short notice (say, because they are long and want to sell). Usually this isn't a problem because the short finds someone else to borrow from and uses that to cover - but if enough people do that then it can trigger a short squeeze even without significant price movement at the beginning, as happened rather dramatically in Porsche shares in 2008.

Not on their own they don't. You can go and short Facebook right now and it won't move the price at all.

No single action in the stock market happens in a vacuum, and longs will absolutely react to what the shorts are doing. And a high short interest is often viewed as a contrarian indicator that dumb short money has piled into the stock and that its actually due for a pop. You often see that at bottoms in the stock.

The vast majority of them aren't trying to do that, similar to how the vast majority of longs aren't trying to P&D.

> But I don't like the people that push false narratives and convince people of things that aren't related to reality.

I hope you see the irony in saying that: This is almost word-for-word what Tesla shorts accuse Tesla of.