S&P 500 posts first weekly loss of the new year on economic slowdown worries

The S&P 500 (SP500) on Friday retreated 0.66% for the holiday-shortened week to settle at 3,972.61 points, while its accompanying SPDR S&P 500 Trust ETF (NYSEARCA:SPY) also shed 0.66%.

The benchmark index’s weekly decline is the first of