S&P is highly correlated with risk currencies and can give you clues or at least let you know when to stay on the sideline when they start to diverge. 10 year treasuries can also help filter your trades. Strong dollar=higher bond prices, higher bond prices= lower yields and the other way around as well. Strong dollar=lower commodity prices etc..Traders you should have at least a basic understanding of market correlations it will with out a doubt put more money in your pocket. More importantly it can keep money in your pocket. Comments are highly appreciated, I want to know and understand as much as can.