(For a live blog on the U.S. stock market, click or type LIVE/ in a news window)
* Quadruple witching could push up volumes, volatility
* All three major indexes set for weekly gains
* Retail stocks gain on prospect of strong holiday demand
* Tesla rises in high-volume trade
* Indexes down: Dow 0.26%, S&P 0.29%, Nasdaq 0.07% (Updates to market open)
By Ambar Warrick and Shreyashi Sanyal
Dec 18 (Reuters) – Wall Street retreated from record highs on Friday as a coronavirus stimulus deal remained in…
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