At some point over the last decade, open educational resources (OER) advocacy in US higher education became zero textbook costs (ZTC) advocacy. The two are intertwined now in a manner that would be difficult to disentangle even if you wanted to try. There are plenty of practical reasons why this might have happened. For example, politicians understand costs much better than they understand learning, which makes policy work and other political advocacy around eliminating textbook costs far easier than advocating for ways that “open” (whatever that word means) might be leveraged to improve student outcomes. But OER / ZTC advocates…