In short summary to say. in 1980s shopkeepers used Black Friday as unofficial offer name to give huge discount to long last shopping after thanksgiving day .As there will be dull in business in between thanksgiving day and Christmas. It's benefit for people as many fail to go to work after thanksgiving day instead they go for shop or take leave as they get to enjoy Saturday and Sunday too.As profits are written in black pen and loss in red pen which was also assumed to be a black Friday rumour among people. If you love to know in detail you can proceed to read below Late-19th century: Thanksgiving Holiday The day after Thanksgiving has been the unofficial beginning of the Christmas season since the late 19th century when President Abraham Lincoln designated the Thanksgiving holiday as the last Thursday in November . But the day didn't earn the name "Black Friday" until much later. In 1905, Canadian department store Eaton's began the first...