[whereismyacc]

I definitely don't know much about finance, but a short is essentially being obliged to sell a position at a future date, right? You match your short position against the fraction of your ETF which is in TSLA, such that you are obliged to sell in the future exactly as many TSLA shares as you indirectly own through the ETF. This way you do not need cash on hand, because you can sell a portion of your ETF to pay off the short.

Theoretically it's not risky because in the scenario that the short becomes expensive, TSLA has gone up the and in turn TSLA has made your ETF appreciate the same amount that you owe due to the short, and vice versa if it goes down.

[eszed]

> TSLA has made your ETF appreciate the same amount

That's no guarantee. I mean, yes, the ETF price reflects its proportion of Tesla stock, but the market as a whole might have declined - even in bear markets some individual stocks appreciate.

Investing in ETFs is a long-term, counter-cyclical strategy. Dips are when you want to buy ETFs, not when you want to be forced to sell them because you took a short that failed to pay off. If you have to do that then you're not only selling the Tesla within your ETF, but also the future upside of all the other stocks in the fund. Isn't that hugely inefficient?

But, I'm not a particularly sophisticated investor, either (thus: ETFs for me), so my intuition may be wrong. Does anyone have some maths to bring to bear on this?

[whereismyacc]

Yeah of course you can't escape the general market risk, i'm only talking about a strategy to avoid net exposure to risk specific to the TSLA stock.

[eszed]

OK. Other people (probably not you) in this thread were talking about this strategy like it was basically risk-free. Compared to a naked short it's, um, obviously a better idea, but I still think others were over-selling it by not mentioning all of the downside risk.

[whereismyacc]

Oh yeah, I don't think I would suggest actually implementing this because it's just a lot of costs and fees to emulate what otherwise would be an index without the stock

[eszed]

Well, the people advocating it are bearish on Tesla and trying to win a bet on that, while "hedging" it with their ETF portfolio. I mean, on the fundamentals I'm bearish on Tesla, too, but there's a not-inconsiderable chance that any day now Musk announces an eleventy-billion dollar contract with the US government, so no way I'm taking that bet. Anyway, I'm not a gambler, so all my investments are super boring.