Casinos are now using something called NORA or Non-Obvious Relationship Awareness in their surveillance work. Successful investing is now very dependent on monitoring non-obvious relationships between securities. It was the key to doing well in 2007 and will be more so in 2008. This is where many err; looking at a single stock, pair of securities or one asset class when it is the ENTIRE interrelated macro puzzle that needs analyzing as well. Sometimes a stock, bond, commodity, currency or any other security goes up and other times it goes down. Predicting those moves is difficult but some can do it. Their changing relationships opens up anomalies and inefficiencies that can be exploited if you work hard enough to identify them.