All standard publishing contracts are enormously lopsided in favor of the publisher. In textbook contracts there is no such thing as standard royalty provisions. Having said that, a review of more than 100 TAA author contracts in my files does reveal some common "ranges."
"Standard" ranges. The concept of "standard" royalties is less common in textbooks than trade books -- so much so that it is almost counterproductive to state ranges. I am concerned that young authors may put too much stock in a so-called standard range, while more seasoned authors may find it contrary to their experience. Accordingly, view the following as indicators only, and don't be afraid to push for royalties appropriate to your stature, leverage and revenue generation for your publisher -- even outside the ranges discussed here.
The technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a communication over an electronic communications network.
The technical storage or access is necessary for the legitimate purpose of storing preferences that are not requested by the subscriber or user.
The technical storage or access that is used exclusively for statistical purposes.The technical storage or access that is used exclusively for anonymous statistical purposes. Without a subpoena, voluntary compliance on the part of your Internet Service Provider, or additional records from a third party, information stored or retrieved for this purpose alone cannot usually be used to identify you.
The technical storage or access is required to create user profiles to send advertising, or to track the user on a website or across several websites for similar marketing purposes.