Should college students be obligated to buy original books for their class?

Not always, there are exceptions, but in the event that a student is unable to lend an original book, that student is forced to buy an original. What is wrong is not allowing a student to work with a used book if the book lends itself to use it again, there are cases in which it is difficult to buy a book right away so it is often necessary to save in order to acquire it.

Buying books is good for both parties, both for the reader and for who does it. Imagine that people dedicated to scientific studies or art decide not to make a book because they know that if they do, nobody will buy it.
Buying books promotes the expansion of knowledge or feeds the imagination.

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