Yes, computer science teachers should be paid more than gym teachers, because their opportunity cost for entering the teaching profession is higher. To elabora

Yes, computer science teachers should be paid more than gym teachers, because their opportunity cost for entering the teaching profession is higher. To elaborate: If well-qualified computer science teachers can make $B working for Bigcorp and $T from teaching, then they'll exit the schools as long as $B > $T. The same logic, of course, applies to gym teachers, but there presumably isn't nearly as much demand outside of the school system for their specific skills. (Here I'm thinking of $B and $T as more total utility than actual salary. In other words we need to convert into dollar terms intangibles like benefits, location, warm fuzzy feelings from shaping young lives, opportunity to work with newer technologies, etc.)