I don't understand this one. A poetry guy says something practical (and completely unrelated to poetry) is a valuable thing, and Eliezer replies that an economics guy would say something about economics?
The message eludes me.
My take: Comparative advantage as I understand it is about specializing and being better off for it (in simplistic terms).
So Eliezer is hinting that you should become good at thing X where X isn't cooking and pay for someone who has specialized in cooking to cook for you, and you'll both be better off.
Edit: I think he phrased it in the way (Economics laureate etc) as parody and to highlight the appeal to authority in the original (why should a poet laureate, no more than a normal poet or any other person what the secret to happiness was).
</ humour destruction through explanation>
This is our monthly thread for collecting these little gems and pearls of wisdom, rationality-related quotes you've seen recently, or had stored in your quotesfile for ages, and which might be handy to link to in one of our discussions.