First of all, foreign copyright protection is better, and the concept of content payment is also in place, so books can be sold at high prices. Secondly, the book publishing industry is a high IQ industry, and machines are irreplaceable. Employees' wages are relatively high, and the cost is naturally high. Finally, the author's works are really worthy of the book price. I have been using a textbook, and the author updates it almost every year. Now it seems to be the fifteenth edition, and each edition will have a lot of different contents. I'm afraid no textbook in China will do this. I have read many so-called planning textbooks, many of which are written for a project or for evaluating professional titles. After they came out, they were gone, not to mention the contents were shoddy and even full of mistakes. Of course, such books can't be sold for money.