Black Friday is the first day of the Christmas shopping season in the USA. It is held on the fourth Friday of November. It h regularly be the bus shopping d of t year si 2005. Its na seems t have origi in Philadelphia i the 1960s wh the lo police us it t describe t congestion cau by s many peo going shop at t same ti. There ha also be reports o violence bet shoppers on Black Friday. Since 2006, there have been 12 reported deaths and 117 injuries throughout the United States. Environmentalists have criticised it too, saying it encourages people to buy things they do not need and the resulting overproduction contributes to climate change.