Is it illegal for teachers to have contracts with textbook companies?

Is it illegal for teachers to get compensated for a textbook that they require their students to use ?Is it illegal for teachers to have contracts with textbook companies?
No it is not illegal for a instructor or college to work with a contract with a textbook company. Is it ethical to charge students so much, that is the question
SInce the books used in a school is usually not determined by a teacher but rather the school district, I do not understand how one teacher could be compensated for the use of a specific book unless it is not part of the approved curriculum.Is it illegal for teachers to have contracts with textbook companies?
no, being that teachers are generally the writers of those textbooks... and usually it's the school disctrict who has the final say in what textbooks will be used for each class.
No, it is not.

In the University setting, it might be considered to be of shady ethics, however not illegal.Is it illegal for teachers to have contracts with textbook companies?
in our state and in others the new wave of behavior has the teachers reaching into their owm poor... pockets to purchase paper and other supplies which sometimes are many and different.

As long as they do not get rich off the backs of their student's or their students parents

it seems to be jake with me

teachers become teachers not to get rich in most places