Our experience this year was $40-50k/year for T50 schools with merit but that was mostly for business schools. You might get a little more though. Are you interested in straight economics/math or with a business mix? Econ is usually separated from the business schools but it can be mixed. Data analytics can be a good alternative to an econ/math background.
I’m from Pittsburgh. I’ve worked with some CMU computational business types. Very sharp people but CMU is not known for merit.
Case might be an option. We liked Northeastern but they defer a lot of kids. Kind of left a bad taste.
Your list is reach heavy. Please find some safety/matches first. Realistically your in-state flagship(s) are the best place to start. You’re lucky to have a good one with UIC. Then aim high. Good luck.