I see what you mean, and yes you can't know the actual quantity how much something has increased or decreased unless you know what the starting number was, but in the special case of 100% drop it will always be zero.
If they say the stock went up 20%, even if they aren't saying it, it's normally talking about from yesterday's closing bell when trading of that stock stopped.
Here's a mental test for you. Every day you either get a 20% increase, or a 20% decrease, and they alternate, so you increase 20% today, then tomorrow it will decrease by 20%, and the next day it will increase again 20% then the next day decrease 20% and this will keep going on forever. If you keep doing that, will you on average end up with the same amount, more, or less?
[–] 1426207? ago
I see what you mean, and yes you can't know the actual quantity how much something has increased or decreased unless you know what the starting number was, but in the special case of 100% drop it will always be zero.
If they say the stock went up 20%, even if they aren't saying it, it's normally talking about from yesterday's closing bell when trading of that stock stopped.
Here's a mental test for you. Every day you either get a 20% increase, or a 20% decrease, and they alternate, so you increase 20% today, then tomorrow it will decrease by 20%, and the next day it will increase again 20% then the next day decrease 20% and this will keep going on forever. If you keep doing that, will you on average end up with the same amount, more, or less?