Because you can take another trade like that when you are faced with similar price action. (tradingsetupsreview.com)
The S&P 500 (SPX.X) chart ending December 12, 2008 shows similar price action as I predicted in my Dow Jones Chart last week. (mytradersjournal.com)
Although it has been showing slightly more relative strength than QQQ, the main ETF for the S&P 500 Index (SPY) has been exhibiting similar price action to the tech - rich Nasdaq index. (morpheustrading.com)