It shouldn't go to zero (ie a 33% one day market drop) bc of circuit breakers etc.
If you backtest there have been 99% drawdowns. It eventually went on to make all time highs (ie >100X return), but I can't imagine very many people managing to hold through a 99% drop lol.
I know it can't mathematically go to zero [some kind of leverage Black swan aside], but practically speaking 100% is a good approximation for the kind of losses that can be incurred. For most people a 90% loss and a 100% loss are functionally the same in terms of severity. Exception if you're a billionare or fake one like SBF in which case you might be fine if you lose 99% of your fortune.
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