<p>jacknjill,</p>
<p>It’s not just one diploma, it’s one degree. If you double major in math/econ, then you either have a BS/BA in Mathematics or a BA in Economics. Let’s say you decide to get the BS in Mathematics. Then you do not have a BA in Economics. It would be incorrect to list this on a resume/CV, and if an employer called Chicago to verify it could get you into some trouble.</p>
<p>Rather, you should say something like “BS in Mathematics, with second major in Economics.”</p>