Doomsday Clock -- Watchmen Sequel

Remember when he said that some of the fictional characters in his own world were real people in this new world? He knew how smart Bruce Wayne was because he read comics.

That, and consider why Veidt values intelligence in the first place: To him, it’s the way to rack up lots of money, and therefore, having lots of money is a sign of high intelligence. Therefore, since Luther and Wayne are the two richest men in the world (which one is richer, anyway? Is that ever settled?), they must also be the two smartest.