I give permission on this page in part to prevent just this kind of pointless delay and inconvenience for teachers. I would like to see this rule applied to whole journal articles and book chapters, not only to short excerpts. I wouldn't object if the rule were limited to non-profit schools and registered students. I recommend in three ways that particularly impede education. Second, for anything longer, it requires teachers to seek permission ahead of time and to wait for publishers to reply.
Some publishers are quick and some are unconscionably slow.
Responsible teachers must plan their incidental photocopying further in advance than their book orders. Finally, it requires teachers to pay whatever fee the publisher names or do without. Some publishers ask nothing, some charge a flat fee per page, some take the class enrollment into account, some frankly gouge. These three rules deeply limit a teacher's flexibility to offer just the right fragments on a certain topic, and the ultimate losers are students. This is pious hypocrisy.