I should admit upfront that it's a little silly I bought this book, I already strongly beleive in the value of open borders and the moral imperitive for them. I'm an Indian citizen (meaning I'm subject to travel and immigration laws as they apply to ) I grew up constantly exposed to the value of immigration and diversity and to the arbitrary and oppressive nature of border control. Since middle school I've deeply felt, and more recently deeply reasoned, that open-borders are the right thing, economically and morally, to do.
So if I'm already convinced of the thing it's arguing for how should I evaluate this book?
One lens is the effectiveness of the medium. This is a persuasive, non-fiction, ethics, econmics, and politics heavy graphic novel. That's wild. The closest thing I've encountered to it before is Understanding Comics, but that has a pretty different goal.
By my (biased) measure, it's incredibly effective. Part of this is due just to the robustness of the argument, and the generosity with which Caplan argues. He doesn't devolve to denigrating the other side (though many times he does imply that some propents of certain arguments don't understand basic numeracy), but steelman's their argument and goes on to show why open borders still make sense.