The idea behind the term Black Friday is that this is the day in which retail stores have enough sales to put them "in the black" - an accounting expression that alludes to the practice of recording losses in red and profits in black." The holiday season is the most important time for US retailers. Black Friday is one of the biggest shopping days of the year and the official start of the holiday shopping season. Many people view this day as chance to get big bargains on Christmas gifts. Post #2: Economics of Black Friday Select 5 economic concepts to explain any aspect of Black Friday. Your examples should list the term/concept then followed by an explanation. Below are a few concepts to consider but not limited to this list. Concepts to consider: opportunity cost, incentives, marginal costs/benefits goods and services, markets supply & demand, money, prices production, competition, costs, technology employment, unemployment, wages