system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does the stock market drop after hearing the White House has been attacked?

Could it be because the White House is a major investment?
gpt
If an attack were to happen on the White House, business and consumer spending would drop because in times of crises both corporations and people prefer to save money than spend it on big investments or luxuries.  

Stock traders try to anticipate consumer and business behavior when valuing stocks and deciding when to buy or sell.  An attack on the White House would certainly hurt business and consumer confidence and cause everyone to spend less, buy less, and take out fewer loans.  Thus stock in most businesses would go down in price while everyone tries to sell it off.

The traders don't want to be stuck with stocks that are losing value both because they are trying to make money, but also because they too might be scared and would rather have the cash on hand.