1987 crash was caused partially by portfolio insurance, a "risk reducing" strategy that involved selling index futures as your the market declined. The idea was to protect your profit. Even better than a stop loss.
Whopse... that didn't work. Don't try to beat the market, just take what it gives, and use good MM to make sure you don't give it back.
Whopse... that didn't work. Don't try to beat the market, just take what it gives, and use good MM to make sure you don't give it back.