Answer:
The value of the stock market drops twenty percent in a single day
Consumers demonstrate a loss of confidence in the stock market
Many shareholders buy stocks on margin
Step-by-step explanation:
If the the stock market suddenly drops, it's a clear sign that something bad is about to happen. Buying on a margin was one of the things that the Federal Reserve was desperately trying to control because it was causing problems. And also, if the consumers lose confidence on the stock market, there must be a reason behind it.