Because it sells books online, which is cheaper than ordinary bookstores, its books can be sold so cheaply. You can also understand that the books bought by the actual buyers are all the same, but the bookstore sells them at a discount because it also needs employees' salaries, store rent, electricity and other expenses, so that it won't lose money, while Dangdang doesn't have that much expenditure, so it wants to attract buyers, but their net profit is actually similar. So the price of the book is for reference only!