This is a wonderful essay:

“Let me posit a duplication theory of education value: if something can be duplicated with limited costs, it can’t serve as a value point for higher education. Content is easily duplicated and has no value. What is valuable, however, is that which can’t be duplicated without additional input costs: personal feedback and assessment, contextualized and personalized navigation through complex topics, encouragement, questioning by a faculty member to promote deeper thinking, and a context and infrastructure of learning. Basically: human input costs make education valuable. We can’t duplicate personal interaction without spending more money. We can scale content, but we can’t scale encouragement. We can improve lecturing through peer teaching, but we can’t scale the timely interventions and nudges by faculty that influence deeper learning.”