1, ISBN income: The General Administration of Publishing allocates dozens to hundreds of ISBN numbers to publishing houses every year. These ISBN numbers are money in themselves, and publishers can sell them to authors or booksellers (ranging from 6,000 to 30,000 yuan each) or publish their own books;
2. Book distribution profit: This book mainly includes two parts: the "book of this edition" published by the publishing house itself and the "cooperative book" cooperated with booksellers, from which the publishing house can make a profit of 20% ~ 50% of the pricing [some publishing houses make a great profit by publishing teaching materials (large circulation × high profit)];
3. Funding from higher authorities: Some publishers can obtain project funding from higher authorities or other units, even far higher than the self-operated income of publishers;
4. Other income: For example, publishing houses can make a lot of money by investing in education, training and even real estate.
I hope I can answer your question.
good luck