Tech leads S&P above 2,600 Amazon, other retail stocks gain

By Tanya Agrawal and Rama Venkat Raman

The benchmark S&P 500 and the blue-chip Dow Jones industrials posted weekly gains for the first time in three weeks while the Nasdaq Composite posted its best weekly performance since the week to Sept. 1. The stock market had a half session on what is known as Black Friday, the day after the Thanksgiving holiday and the unofficial start of the U.S. holiday shopping season.

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