A $280 college textbook busts budgets, but Harvard author Gregory Mankiw defends royalties. By Richard Read. The Oregonian/OregonLive. post
Asked in an email, "Would you ever write an open-source textbook? Why, or why not?" Mankiw responded:
"Let me fix that for you: Would you keep doing your job if you stopped being paid? Why or why not?"
The economist's fix makes clear that he cannot conceive of any activity, and especially any activity that one might be good at, as being other than a transaction.
I've found otherwise.