Oh yeah, he actually loves game theory! And he also really enjoyed The Cartoon Guide to Economics, which, from what he told me, was kind of similar.

I'll check out that book! I don't know what causal modeling and decision theory are, but they sound like things he would like. smile

(He also likes graphic design and typography. He is a fun dude. Haha, right now he is explaining to me something about rolling up the "Turtle Unicorn" poster he just made--something about Gaussian curvature. ?? )