Thanksgiving is always on a Thursday. The day after it has been known as Black Friday. It is the start of the holiday shopping season，and it has been the busiest shopping day of the year in the US since 2005.Most stores offer big sales on Black Friday. They open their doors quite early in the morning. They try to attract shoppers with big discounts. Some items(商品)like TVs and clothes are much cheaper than usual. Stores may even lose money on these items. They hope that shoppers will buy gifts for other people while they are in the store. Black Friday is a great time to go shopping. However，there are problems. The biggest one is that there are not enough low—priced items. Each store may only have a few. So people stand in long lines to get them. They may wait three to four hours before a store opens.