Sounds like he should look into an economics degree (with a quantitative minor if not already offered) and a gender studies minor.
MIT is good with the economic impact of gender - economics of divorce, salary negociations by gender, etc.
Urban planning could be a good major, too.
Rather than trying to figure a major as a dual enrolled HS student, he should take as many courses in all social sciences as possible (not just economics, but also geography, policy, gender studies, sociology, poli sci, anthropology, psychology, even interpersonal communication) as well as applied math courses (calculus then calculus-based statistic+data science) as his CC will allow. Of course he needs to take through level 4 or higher in a foreign language and have the basics covered in English&Science.
His goal should be to keep his DE credits and HS graduation credits to then apply to solid universities where he’ll use these DE credits as a strong foundation for his interests. He won’t be the only one starting college with an advanced foundation and at a college with a lot of resources he will find ways to develop his interests.
Run the NPC on MIT, Brown, and American University (these 3 would have different methods of calculating your SAI).
If these are out of budget or don’t seem in line with his abilities, investigate honors colleges/programs and ways to increase rigor (adding quantitative courses, graduate courses in Economics&Gender studies, for instance).