True traders should look FORWARD to a day like this! This is when those few tickers that were spewing emeralds out their magical whale blowholes yesterday or last week or whenever (the ones a trader was kicking himself for not at least dropping a Benjamin or two on the day before!), maybe those magical whales still got some money in them... they're just recovering from erupting all them jewels and now they're that much cheaper to buy.
Of course, always do the proper DD to make sure they weren't hemorrhaging from a PnD raiding party. Avoid those for obvious reasons!