Quote from crgarcia:
This is why I say all the time.
Indexes provide instant diversification.
Besides the SSO tracks the DAILY % move of the S&P, so you never can owe money to the broker (even if it goes down more than 50%).
if you don't trade futures but want to trade S&P, use SSO/SDS.
If you are a bit strapped for cash, long or short the cheapest (SSO considerably less than SDS right now....instead of SDS, short the SSO).