But I've some questions: when he's on the road speaking, what is it he's not doing?
- Presumably he's not at Harvard mentoring his graduate students or teaching his undergrads. (Maybe he will have fewer guest lecturers in Econ 101 and more of the real Mankiw?) Maybe he cuts his office hours?
- Or maybe he's not doing economic research, writing the next great paper which is going to win him a Nobel prize?
- Or maybe he's not home with his family, investing in their social capital and his happiness? (Granted, none of the activities he's not doing would show up in the GDP, but Professor Mankiw is still a sentient human being and he's probably contributing to the good of the society wherever he is and whatever he's doing.