1. Be even more polite than usual.
2. Relate your points to Greg Clark’s book as much as possible. This is a forum on his book.
3. You are engaging the book, and if you end up in a running back and forth with another commentator, the odds that you are producing a public good are no more than p = 0.21.
4. Comments which "leap ahead" and focus on later parts of the book, beyond the specified pages, will be deleted, no matter how brilliant.