The benchmark SPDR S&P 500’s (SPY) recent price action has many investors jittery. After falling below its 50-day moving average line on July 31, SPY hasn’t reclaimed that gauge of financial health in almost two weeks. That’s fueling analyst concerns about strong bearish signals in the market. While talk of a sell-off may be premature, SPY’s 6% return this year lags far behind its outsized 32% gain in 2013.