Do you know what the term "Black Friday," the day after Thanksgiving shopping, is in reference to? I just learned it this morning while reading a TIME article online:
"For many retailers, holiday sales account for as much as 40% of their annual revenue and up to 80% of their profits — hence the name Black Friday or the day when stores traditionally go from being 'in the red' to 'in the black'."
(Note: Philly claims coining the term in 1965 when they referred to that day as Black Friday for the first time because the traffic on that day resembled the stress and chaos of Black Friday in 1929. I like the modern reference better.)