Why are there flash crashes in the stock market but no flash rallies?

Fear is stronger than greed.


This.

(And perhaps more specifically, in this context: fear is more widely and more quickly self-reinforcing, self-perpetuating and self-compounding, at a "societal-trading level" than greed is.)
 
Flash crash happened in 2010, 1987. As far as I know, there has been no flash rallies in stock market history. I wonder why this is so. Anyone has insights why there have been no flash rallies so far like the flash crashes that we have seen in 2010 and 1987?

Notwithstanding the facts you omit:

There are more 'longs' than 'shorts' in the market.

When the longs panic sell, the move is 'stronger' than when the shorts panic buy.
 
Flash rally? Hmm

DRYS moved 1500% in days.

Dryships-stock.png
 
There are flash rallies...we call them bubbles.


Typically they move at a very different rate from that of "flash crashes", though, I think?


Don't traders who are shorts have fear too?


Not in the same way, to the same extent, or at the same rate as traders who are long, no; and maybe there aren't as many of them, either. (I may be saying the same thing as Userque, above, just in slightly different words, though, so I'll stop there.)
 
I think generally ‘potential energy’ of the market is far greater to the downside simply because the value of speculative capital positioned to the long side is many times that of what is short or ‘sitting on the sidelines’ ready to be deployed.

OP is specifically talking about the broad stock market. Individual names or commodities are obviously different animals, so to speak.
 
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