Then beyond that, the more information, the better, but the rest is not essential.
I know one of them well, an individual who is up 9 figures over many years while staying market neutral.
Don't be fooled into thinking there is no such thing as knowing what you are doing.
You might owe more than you own, if the price rises, you fail the margin call, and they liquidate.
https://twitter.com/BXRekt/status/1527462460457984000
Here's a million dollar short that got liquidated all of seven hours ago. Shorting Bitcoin is madness, partially because no regulation prohibits most exchange operators from frontrunning their own customers (besides the ones that voluntarily signed on to become the benchmarks for CME's Bitcoin futures price). Exchanges and market makers will collaborate to artificially push prices around to optimally liquidate shorts -- it happens all the time. They love people shorting Bitcoin.
Yes.
> Why would that be particularly bad if the momentum is downward?
That is why. You are too late for justifying a short position if it is already going down as you can still get yourself liquidated quickly if the price jumps in one day after a correction.
Holding a short position can be profitable, but also know that a short squeeze is easy.
There was an incredible shorting opportunity with the recent Luna fiasco though. Literal millions made overnight.
It does, however, exclude DCA, which is almost always a sensible investment strategy.
It might make more sense to lump-sum invest, if volatility is small relative to the return.
At least for the stock market, it's not often worth sitting on cash.