A student who is pursuing a BSBA degree while majoring in Economics can add a second major. If this second major also leads to a BSBA degree -- e.g., International Business, Finance, Accounting, Marketing -- then this student is only subject to the set of general education requirements that is peculiar to the BSBA degree.
If, however, this student were to choose a second major that leads to something other than a BSBA degree -- e.g., BS, BA -- then this student will be subject to two non-identical sets of general education requirements. For instance, if a student were to major in Economics that leads to a BSBA, while s/he also majors in History, which leads to a BA, then s/he will be subject to two sets of general education requirements, one pertaining to the BSBA, while the other applies to the BA.
This 'concurrent degree' track will take extra time to complete simply because of the extra set of general education requirements. If the student really desires the History major in this hypothetical situation, then s/he should simply consider majoring in Economics that leads to a BA degree. If s/he does that, then since both Economics and History lead to the BA degree, the student is only subject to the set of general education requirements that applies to the BA degree.