"BLACK FRIDAY"?
Why the heck they call it that?
The day when retailers get into the black?
That's a lame definition.

I think it has more to do with the darkness of DEBT ENSLAVEMENT that Folks allow themselves to get entrapped in with Credit Cards.
RUSH, RUSH, spend without thinking like there's no tomorrow, worry about the anxiety & struggle of paying off 25% - 35% interest default rates later.

Just another BANKER'S TRICK.