3 Black Friday trends for retail investors

It's almost here. No, not the warmth of family and friends gathered around table. I'm talking the start of the holiday shopping season on Black Friday. That's the decidedly American pastime -- which has been coming earlier each year -- of fighting hordes of similarly minded bargain shoppers in parking lots and aisles for cut-rate electronics, toys and clothing.

If you ever wondered what the zombie apocalypse would look like, just visit your local Walmart (WMT) at around 6 a.m. the day after Thanksgiving.

Wall Street has been preoccupied with the retail sector recently as quarterly earnings flowed out and management teams give guidance on what to expect for the fourth quarter.