S&P 500 slips nearly 3% to post worst weekly performance since early Dec. last year

The S&P 500 (SP500) on Friday shed 2.67% for the holiday-shortened week to settle at 3,970.04 points, posting losses in three out of four sessions. Its accompanying SPDR S&P 500 Trust ETF (NYSEARCA:SPY) also fell 2.67%.

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