Out-of-stock refers to a book that sells well in the market, and all the stocks are sold out, which can't meet the needs of readers if it is supplemented by the publishing house. Under normal circumstances, out-of-stock books are best sellers with good reputation, valuable content and wide audience, such as "Three-body" on the market now.

Out-of-stock books have a positive impact on publishers and readers. For publishing houses, out-of-stock books not only bring considerable profits, but also become publicity of brands and reputations. At the same time, publishers are also encouraged to continue publishing high-quality books. For readers, out-of-stock books mean that readers and society highly recognize this book, and also promote readers' attention to other good books.

However, the book out-of-stock incident has also brought some problems. Some merchants and individuals take advantage of the phenomenon of out-of-stock books to obtain illegal benefits through speculation and price gouging, which not only violates business ethics, but also causes some unfairness. Faced with these problems, we should strengthen market supervision and legal provisions to ensure fair and orderly market and readers' rights and interests.