<p>Can someone have a double major in an interdisciplinary major (international relations, cognitive science, etc...) and economics (or any non-interdisciplinary major)?</p>
<p>Is there really such a thing as a non-interdisciplinary major? Economics is certainly connected to other fields.</p>
<p>Yes, it's possible to double major in two unrelated fields, but it may take you a little longer because the required coursework probably won't overlap much.</p>