Pop quiz-
Lets say you have a stock valued at 100 dollars.
It drops to 80 dollars. What do you do?
You give not enough information. Why did it drop? general crisis? losing money? panic? corrupted CEO discovered? is the company still "healthy"?
not knowing anything and being FORCED to decide quickly, probably I would risk staying in if that money isn't that important, but if I need it, or it is necessary to keep working in the stockmarket then I would sell.
I really would like more informations about that however.
Some years ago, in my country, a manager ( CEO, owner, don't know. Important person) of a company was discovered stealing money from the company or something like that. Stocks dropped really low, but the company kept producing and selling like before, employees were paid and all that. Eventually, company recovered and whoever bought at lowest price probably got lots of money ( I hate beign too young at the wrong time! ).
Price doesn't mean much, since it could just be meaningless panic. Demand & offer works for stocks too, as far as I know, which means that if people panic and sell, then price drops. which makes more people panic and sell. Like a tantrum spiral.
Whatever I choose to do, however( sell or buy), I would look for further information about the company then keep track of the title if I think it has hope of recovery. At the lowest price buy, then wait till it goes back. Of course, many things can go wrong then.
Actually, if it has a good chance to raise again after dropping, it may be even better to sell now, then use money you get to buy more stocks later, when price is much lower.
At the end, not being a person who plays with stocks, I think that it may be better to sell , whatever your opinion is : if you think it will go bankrupt, you need to get out as soon as possible. If you think it is going to raise again after a period of dropping, then it may be better to get most money now, to buy more stocks at the peak of panic.
Of course, selling stocks increase panic, while buying decreases it, which makes things much more complicated.
I think I would sell and keep track of prices ( companies who drop are more interesting than ones who are stable or rise slowly I think).
But to be able to give a good answer I would need to know how other people usually act in these situations. It is a complex system.
Of course, in the time it took me to write this, it may already be too late to do anything.
A last point: if 80 is, in my opinion, the lowest point it will reach, then I buy instead of selling.