An answer by @Ubiquitous reminded me of a past discussion 3 years ago about using the JEL classification system for tagging in economics.se
I am bringing the issue up once more, and I make the following specific proposal:
To start including in the tag label the JEL classification code, say "game-theory-jc-C7" or simply "game-theory-C7".
For existing tags I am under the impression that the tag-name cannot be changed (SE crew please clarify this, thank you). If this is indeed the case, we would need to create the tag "game-theory-C7" and then make "game-theory" a synonym to the former.
As usual, answers are for elaboration and alternative proposals, while one can simply upvote ("agree") or downvote ("disagree") the question.
UPDATE February 8th 2018
Now that I have earned the Tumblweed badge for this post, ("Asked a question with zero score, no answers, no comments, and low views for a week"), I guess we can put the whole "we want more Academia here" issue to rest.