First of all, look at the popularity of the author or book signed by himself.

Second, look at the number of people signing.

When the author signs a book for sale, he will buy the book and get the author's signature.

Generally refers to the creator of literary, artistic and scientific works, and sometimes refers to the founder of a certain theory, or the organizer or planner of an event. In the copyright laws of the Soviet Union, France, the Federal Republic of Germany, Spain and other countries, the author refers to a natural person who directly engages in literary and artistic creation activities through his own independent thoughts and uses his own skills and methods to create works that reflect the creator's personal characteristics.