Here's another ratio pair I like to watch. Its SPDR Consumer Staples ETF vs SPX. This chart will rise when XLP out performs the SPX on a relative basis. As you can see the XLP/SPX has just come into a key support zone. If XLP/SPX breaks this support it's very bullish. However, if it bounces like is has in the past expect a sell off in stocks.
Note.. the lower chart is the SPX.
Note.. the lower chart is the SPX.