As entrepreneurs, we must be observant and always pay attention to the inventory of goods, especially retail traders, both offline and online, who have various types of goods. Entrepreneurs also have to pay attention to which stock is too large or whose sales turnover is low so they need to carry out a promotional strategy which we know as a Clearance Sale. I also often encounter clearance sale strategies applied in minimarkets, such as buy 1 get one, on food products that are approaching their expiry date.