Wall Street slips on Black Friday

Black Friday couldn't cheer up investors. Stocks on Wall Street fell in a shortened trading session. Investors grew anxious as the discord between the United States and China over Hong Kong reignited trade tensions. The major indexes lost roughly four tenths percent. For the week, they gained ground.

Exponential ETFs CEO Phil Bak:

SOUNDBITE: EXPONENTIAL ETFS CEO PHIL BAK (ENGLISH) SAYING:

"What is interesting is that retail and Amazon were down more than the market today. But again on a very low volume day, I wouldn't read too much into it. Let's see how the market comes back on Monday."

Black Friday sales appeared to pull in smaller crowds at stores. Kohl's, Gap, Home Depot and other retail stocks slipped .

Trade-sensitive chip stocks like Intel and Nvidia declined.

PG&E shares fell. Bloomberg reported that a bankruptcy judge sided with wildfire victims, saying the company was subject to a doctrine that holds utilities liable for covering the costs of wildfires.

Shares of Tech Data jumped. The tech equipment distributor said private equity firm Apollo Global Management raised its bid to about $5 billion.